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GPSC Assistant Engineer 2025: Assistant Engineer (Mechanical) Class-2, Narmada Water Resources, Water Supply and Kalpsar, Concerned Subject

  • Date: 23 February 2025
  • Paper code: 36/2024-25
  • Series: BKQ
  • Language: English
  • 32 pages
GPSC Assistant Engineer 2025 question paper, Assistant Engineer (Mechanical) Class-2, Narmada Water Resources, Water Supply and Kalpsar, Concerned Subject, page 1 of 32
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BKQ
                                                PROVISIONAL ANSWER KEY

Name of the post                          Assistant Engineer (Mechanical), Class-2 Narmada Water Resources ,
                                          Water Supply and Kalpsar Department
Advertisement No.                         36/2024-25
Preliminary Test Held On                  23-02-2025
Que. No                                   001-200
Publish Date                              27-02-2025
Last Date to Send Suggestion (s) 03-03-2025
THE LINK FOR ONLINE OBJECTION SYSTEM WILL START FROM 28-02-2025; 10:00 AM ONWARDS

                                                   Instructions / � ૂચના
Candidate must ensure compliance to the instructions mentioned below, else objections shall not be considered: -

(1) Candidates have to pay fees of Rs.100/- for each objection. The fees can be paid from the link given herewith.

(2) The Candidate will be able to submit objection only after payment of the fees. The generation of the receipt will only be
    considered as final submission.
(3) The Candidate must retain the receipt of the payment of the fees. The fees, once paid, will not be refunded under any
    circumstances.
(4) All the objections should be submitted through ONLINE OBJECTION SUBMISSION SYSTEM only. Physical or
    submission through any other means will not be considered.
(5) All objections are to be submitted with reference to the Master Question Paper published with provisional answer key,
    published herewith on the website / online objection submission system. Objections should be sent referring to the
    Question No. & options of the Master Question Paper. Objections regarding question nos. and options other than
    provisional answer key (Master Question Paper) shall not be considered.
(6) Objections and answers suggested by the candidate should be in compliance with the responses given by him in his
    answer sheet. Objections shall not be considered, in case, if responses given in the answer sheet /response sheet and
    submitted objections are differed.
(7) Supportive document to the objection must be uploaded, without which objection will not be considered.

ઉમેદવાર� નીચેની � ૂચનાઓ�ું પાલન કરવાની તક� દાર� રાખવી, અન્યથા વાંધા-� ૂચન �ગે કર� લ ર�ૂઆતો ધ્યાને લેવાશે નહ�

(1) ઉમેદવાર� દર� ક વાંધા દ�ઠ �િપયા ૧૦૦/-ફ� ભરવાની રહ�શે. � ફ� આ સાથે આપેલ લ�ક ઉપરથી ભર� શકાશે.

(2) ફ� ભયાર્ બાદ જ વાંધો સબમીટ થઈ શક્શે. ફ� ભયાર્ની આખર� પહ�ચ જ આખર� સબમીશન ગણાશે.

(3) ફ� ભયાર્ની પહ�ચ ઉમેદવાર� સાચવી રાખવાની રહ�શે. એક વાર ભર� લ ફ� કોઈ પણ પ�ર�સ્થિતમાં પરત આપવામાં આવશે ન�હ.

(4)   વાંધા ફક્ત ઓનલાઈન ઓબ્�કશન સબમીશન સીસ્ટમ દ્વારા જ સબમીટ કરવાના રહ�શે. �બ�, ટપાલ અથવા ઈ-મેઈલ ક� અન્ય કોઈ ર�તે
      આયોગને મોકલવામાં આવેલ વાંધા ધ્યાને લેવામાં આવશે નહ�, �ની ખાસ ન�ધ લેવી.

(5) ઉમેદવાર� પોતાને પર�ક્ષામાં મળે લ પ્ર��ુ�સ્તકામાં છપાયેલ પ્ર�ક્રમાંક �ુજબ વાંધા-� ૂચનો ર�ૂ ન કરતાં, તમામ વાંધા-� ૂચનો વેબસાઈટ પર
      પ્રિસધ્ધ થયેલ પ્રોિવઝનલ આન્સર ક� (માસ્ટર પ્ર�પત્ર) ના પ્ર�ક્રમાંક �ુજબ અને તે સંદભર્માં ર�ૂ કરવા. માસ્ટર પ્ર�પત્રમાં િન�દ� ષ્ટ પ્ર� અને
      િવકલ્પ િસવાયના વાંધા ધ્યાને લેવામાં આવશે નહ�.

(6) ઉમેદવાર� પ્ર�ના િવકલ્પ પર વાંધો ર�ૂ કર� લ છે અને િવકલ્પ �પે � જવાબ � ૂચવેલ છે એ જવાબ ઉમેદવાર� પોતાની ઉ�રવહ�માં આપેલ હોવો
      જોઈએ. ઉમેદવાર� � ૂચવેલ જવાબ અને ઉ�રવહ�નો જવાબ �ભ� હશે તો ઉમેદવાર� ર�ૂ કર� લ વાંધા ધ્યાને લેવાશે નહ�.

(7) વાંધા માટ� સંદભર્ જોડવો આવશ્યક છે , �ના િવના વાંધો ધ્યાને લેવામાં આવશે નહ�.


 Website link for online objection submission system: https://www.formonline.co.in/GPSC_TRACK/SearchPage.aspx
GPSC Assistant Engineer 2025 question paper, Assistant Engineer (Mechanical) Class-2, Narmada Water Resources, Water Supply and Kalpsar, Concerned Subject, page 2 of 32
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1.   What is the unit of G from Griffith’s energy criterion?
     (A) J – m2		                                     (B) J/m2
     (C) J – m		                                      (D) J/m

2.   Copper is used for making electrical conductors because it
     (A) is ductile
     (B) resists corrosion
     (C) has a low resistance to current flow
     (D) is cheap

3.   IZOD test measures
     (A) hardness		                                   (B) ductility
     (C) impact energy		                              (D) grain size

4.   Brass is an alloy of
     (A) copper and zinc		                            (B) tin and zinc
     (C) copper and tin		                             (D) copper and Al

5.   The tempering process is used in steels to achieve
     (A) lower hardness by transforming austenite to pearlite
     (B) lower hardness by transforming martensite to iron carbide particles in the matrix of ferrite.
     (C) high hardness by transforming austenite to martensite
     (D) high hardness by transforming martensite to pearlite

6.	The ratio of power output of the centrifugal pump to the power input to the pump is called
    ___________.
     (A) mechanical efficiency                        (B) overall efficiency
     (C) manometric efficiency                        (D) all of the above

7.   Grey cast iron is
     (A) iron, where graphite present is in spherical form
     (B) iron, where all the carbon is in a combined form
     (C) iron, where part of the carbon is in graphite flakes
     (D) all of the above

8.   The upper moulding flask used in sand casting is called
     (A) cope		                                       (B) cheek
     (C) drag		                                       (D) core


2 | [BKQ]                                                                                       [Contd.
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9.    The main disadvantage of aluminium as a pattern material for making the master pattern is
      (A) high strength		                              (B) low cost
      (C) high cost		                                  (D) low density

10.   Permeability of moulding sand is increased with
      (A) increasing the clay content
      (B) decreasing the clay content
      (C) increasing the compacting pressure
      (D) fine grain size

11.   The best shape for sprue in sand casting is
      (A) straight cylindrical		                       (B) tapered
      (C) prismatic		                                  (D) shape does not matter

12.   Riser for a sand casting can be designed by
      (A) Caine’s method
      (B) Naval research laboratory method
      (C) Modulus method
      (D) all of the above

13.   The pattern used in precision investment casting is normally made up of
      (A) wood		                                       (B) metal
      (C) plastic		                                    (D) wax

14.   Which “term” is not associated with the casting process?
      (A) Gate		                                       (B) Runner
      (C) Riser		                                      (D) Swaging

15.   The forging operation of “upsetting” is
      (A) reverse of drawing down process
      (B) a bending operation
      (C) a drifting operation
      (D) none of the above

16.   “Blanking” is an expression used in
      (A) sheet metal work
      (B) casting process
      (C) drawing
      (D) rolling


[BKQ]                                                                                   P.T.O.] | 3
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17.   Hot working of a metal in metal-forming processes is
      (A) working at melting temperature
      (B) working below the recrystallization temperature
      (C) working above the recrystallization temperature
      (D) working at ambient temperature

18.	__________ is the vertical height of the centerline of the centrifugal pump above the water surface
     in the tank from which water is to be lifted.
      (A) delivery head		                             (B) static head
      (C) suction head		                              (D) manometric head

19.   Which of the following steel section is generally a square cross-section?
      (A) Slab		                                      (B) Billet
      (C) Ingot		                                     (D) None of the options

20.   Which of the following sheet-metal operation induces only tensile stress in the part?
      (A) Stretch forming		                           (B) Coining
      (C) Drawing		                                   (D) Trimming

21.	The specific speed of a centrifugal pump is defined as the speed of a geometrically similar pump
     when ____________.
      (A) the head developed is unity and discharge is one cubic metre
      (B) the head developed is unity and shaft horsepower is also unity
      (C) the discharge is one cubic metro and shaft horsepower is unity
      (D) none of the above

22.   For very thick plates, which of the following edge preparation is preferable?
      (A) single v		                                  (B) single u
      (C) double u		                                  (D) double v

23.   The flame type that is normally used to weld cast iron in oxy-acetylene welding method is
      (A) carburizing flame
      (B) neutral flame
      (C) oxidizing flame
      (D) none of the option

24.   Filler material is not required in which of the following type of welding process?
      (A) Oxy-acetylene welding
      (B) Arc welding
      (C) Resistance welding
      (D) Oxy-hydrogen welding


4 | [BKQ]                                                                                         [Contd.
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25.   Arc blow in manual metal arc welding is caused by
      (A) the use of AC welding with non-consumable electrodes
      (B) the use of DC welding with consumable electrodes
      (C) the use of AC welding with consumable electrodes
      (D) none of the above

26.   Electron-beam welding is used for welding due to
      (A) high depth-to-width ratios
      (B) low depth-to-width ratios
      (C) depth-to-width ratios equal to one
      (D) with large heat-affected zone due to large heat generated

27.   Thermit mixtures used in thermit welding normally use which of the following metal?
      (A) Manganese		                                  (B) Magnesium
      (C) Aluminium		                                  (D) Alum

28.   A welding process that is preferred to weld ship hulls is
      (A) manual metal arc welding
      (B) gas metal arc welding
      (C) submerged arc welding
      (D) flux cored arc welding

29.   Powder- metallurgy process involves which of the following operations in sequence?
      (A) Powder mixing, sintering, compacting and finishing
      (B) Powder mixing, sintering and finishing
      (C) Powder mixing, compacting and sintering
      (D) Powder mixing, compacting, sintering and finishing

30.   Metal powder particle size is reduced during atomization by
      (A) decreasing gas velocity
      (B) increasing gas velocity
      (C) decreasing gas pressure
      (D) decreasing metal volume

31.   The green density of the powder-metallurgy part will be increased by
      (A) increasing the sintering temperature
      (B) decreasing the sintering temperature
      (C) increasing the compacting pressure
      (D) decreasing the compacting pressure


[BKQ]                                                                                      P.T.O.] | 5
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32.	To improve the mechanical properties of a powder metallurgy part, which of the following finishing
     operation is used?
      (A) Repressing		                                 (B) Sizing
      (C) Machining		                                  (D) None of the options

33.   The final strength of a powder-metallurgy part can be increased by
      (A) increasing the sintering temperature
      (B) decreasing the sintering temperature
      (C) increasing the lubricant in the powder-mix
      (D) decreasing the compacting pressure

34.   The endurance limit of a material refers to
      (A) The maximum stress a material can withstand without yielding
      (B) The stress below which a material can withstand infinite number of loading cycles
      (C) The maximum stress during an impact test
      (D) The point of plastic deformation

35.   The ratio of tensile strength to the density of a material is known as
      (A) Specific strength
      (B) Toughness
      (C) Elastic modulus
      (D) Resilience

36.   What is the term for the capacity of a material to store energy when deformed elastically?
      (A) Toughness
      (B) Resilience
      (C) Hardness
      (D) Ductility

37.   Which of the following is a time-dependent property of materials?
      (A) Elasticity
      (B) Plasticity
      (C) Creep
      (D) Toughness

38.   What is the property of a material that allows it to be hammered or rolled into thin sheets?
      (A) Ductility
      (B) Malleability
      (C) Plasticity
      (D) Elasticity


6 | [BKQ]                                                                                       [Contd.
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39.   What measures a material's resistance to volume change under pressure?
      (A) Elastic modulus		                            (B) Shear modulus
      (C) Bulk modulus		                               (D) Toughness

40.   Which type of stress is responsible for the twisting of materials?
      (A) Tensile stress
      (B) Compressive stress
      (C) Direct shear stress
      (D) Torsional shear stress

41.   The dielectric fluid in the electric discharge machining process should
      (A) ionize rapidly after the spark discharge has taken place
      (B) have a high viscosity
      (C) be chemically neutral so as to not attack the electrode
      (D) have a low flash point

42.   _________ is not a very good electrode in the electric discharge machining process.
      (A) Graphite
      (B) Copper
      (C) Grey cast iron
      (D) Tungsten

43.   The non-conventional machining process that gives the highest material removal rate is
      (A) Electric Discharge Machining
      (B) Electrochemical Machining
      (C) Ultrasonic Machining
      (D) Up-Milling

44.   Which of the following process is suitable for machining brittle material?
      (A) Electric Discharge Machining
      (B) Electrochemical Machining
      (C) Ultrasonic Machining
      (D) None of the above

45.   While increasing the feed rate in abrasive water jet machining, it
      (A) improves the surface finish
      (B) decreases the drag
      (C) deteriorates the surface finish
      (D) none of the above


[BKQ]                                                                                       P.T.O.] | 7
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46.   In Abrasive Jet Machining (AJM), the material removal is primarily achieved by
      (A) Thermal erosion		                               (B) Electrochemical reaction
      (C) Impact erosion		                                (D) Mechanical shearing

47.   In Plasma Arc Machining (PAM), the high temperature of the plasma arc is typically achieved by
      (A) Combustion of fuel gases
      (B) Compression of air
      (C) Ionization of gas
      (D) Electrical resistance

48.   Which of the following is a disadvantage of unconventional machining processes?
      (A) High material removal rate
      (B) No tool wear
      (C) High initial investment
      (D) Non-contact machining

49.   The accuracy of linear measurement is more with which of these instruments?
      (A) Steel rule		                                    (B) Vernier calliper
      (C) Micrometer		                                    (D) Scale

50.   The length standard that is most commonly used in the machine shops for high accuracy is
      (A) metre rod
      (B) slip gauge
      (C) precision scale
      (D) none of the above

51.   Which symbol is used to denote a shaft in fits and tolerances?
      (A) h		                                             (B) H
      (C) s		                                             (D) a

52.   What is the fundamental difference between a "fit" and a "tolerance"?
      (A) Fit is for mating parts whereas tolerance is for individual parts
      (B) Fit is for hole size only whereas tolerance is for shaft size
      (C) Fit measures maximum variation whereas tolerance measures minimum variation
      (D) Fit deals with functional clearance whereas tolerance deals with assembly conditions

53.   For an interference fit
      (A) the lower limit of the shaft should be greater than the lower limit of the hole
      (B) the lower limit of the shaft should be greater than the higher limit of the hole
      (C) the higher limit of the shaft should be greater than the higher limit of the hole
      (D) the higher limit of the shaft should be greater than the lower limit of the hole


8 | [BKQ]                                                                                         [Contd.
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54.   The application for which a point-to-point numerical control system can be used is a
      (A) lathe machine
      (B) milling machine
      (C) punching machine
      (D) none of the above

55.	While specifying the axes of the CNC machine tool (as per the ISO standards), the spindle axis is
     considered as
      (A) X-axis		                                        (B) Y-axis
      (C) Z-axis		                                        (D) A-axis

56.   Preparatory functions in a CNC program (in word address format) are identified by the letter
      (A) F
      (B) G
      (C) M
      (D) A
57.	Using word address format, the center of an arc in the XY-plane using circular interpolation is
     programmed using the letters
      (A) I and J		                                       (B) I and K
      (C) J and K		                                       (D) C and R

58.   The disadvantage of numerical control machining is_________
      (A) operator skill required is high
      (B) higher investment in equipment costs
      (C) special training required for maintenance personnel
      (D) all of the above

59.   Which of the following is NOT a component of a linear programming problem?
      (A) Decision variables
      (B) Objective function
      (C) Constraints
      (D) Exponential equations

60.   The feasible region in Linear Programming is defined as
      (A) The set of all possible solutions
      (B) The set of solutions that satisfy all constraints
      (C) The set of solutions that maximize the objective function
      (D) The region outside the constraints


[BKQ]                                                                                        P.T.O.] | 9
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61.   Graphical method in Linear Programming is used for
      (A) solving LP problems with any number of variables
      (B) solving LP problems with exactly two decision variables
      (C) solving non-linear programming problems
      (D) solving problems without constraints

62.   In the Simplex Method, slack variables are introduced to
      (A) Eliminate redundant constraints
      (B) Convert inequalities into equalities
      (C) Represent decision variables
      (D) Optimize the objective function

63.   Which of the following is TRUE about the degeneracy in the Simplex Method?
      (A) It occurs when there are no constraints.
      (B) It occurs when more than one solution exists.
      (C) It occurs when one or more basic variables are zero.
      (D) It occurs when the feasible region is unbounded.

64.   The Transportation Problem is used to
      (A) Minimize the total transportation cost of distributing goods.
      (B) Maximize the total profit of production.
      (C) Determine the shortest path between two points.
      (D) Solve unbalanced demand and supply problems.

65.	Which method is commonly used to find the initial feasible solution for the Transportation
     Problem?
      (A) Simplex Method		                             (B) North-West Corner Rule
      (C) Hungarian Method		                           (D) Dual Simplex Method

66.   In the Assignment Problem, the number of decision variables is equal to
      (A) The total number of jobs minus one.
      (B) The total number of jobs multiplied by the number of workers.
      (C) The total number of jobs.
      (D) The total number of workers.

67.	The probability distribution for the number of customers in the system in an M/M/1 system follows
      (A) Poisson distribution		                       (B) Exponential distribution
      (C) Uniform distribution                         (D) Binomial distribution


10 | [BKQ]                                                                                    [Contd.
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68.	In the notation (a/b/c): (d/e/f) for summarizing the characteristics of the queueing situation, the
     letters b and d stand for
      (A) service time distribution & queue discipline
      (B) number of servers & size of calling source
      (C) number of servers & queue discipline
      (D) service time distribution and the maximum number allowed in the system

69.   The primary difference between PERT and CPM is
      (A) PERT is used for projects with well-defined activities, while CPM is used for projects with
           uncertain durations.
      (B) CPM is used for projects with deterministic durations, while PERT is used for projects with
          uncertain durations.
      (C) PERT is a project management tool, while CPM is a scheduling technique.
      (D) There is no difference; they are same.

70.   In the construction of networks, dummy activities are introduced in order to
      (A) compute the slack on all events
      (B) transfer resources if necessary during monitoring
      (C) clearly designates a precedence relationship
      (D) simply crash the plan.

71.	For a closed system, the difference between the heat added to the system and work done by the
     system is equal to the change in
      (A) enthalpy		                                     (B) entropy
      (C) internal energy		                              (D) temperature

72.   An isothermal process is governed by
      (A) Boyle`s law
      (B) Charle`s law
      (C) Joule`s law
      (D) Gay Lussac`s law

73.   Which is the characteristic feature of a quasi-static process?
      (A) Infinite slowness		                            (B) Rapidity
      (C) Stability		                                    (D) Stationary existence

74.   Torr is a unit of
      (A) temperature		                                  (B) pressure
      (C) energy		                                       (D) power


[BKQ]                                                                                     P.T.O.] | 11
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75.   The integrating factor of the quasistatic displacement work is
      (A) 1/T		                                       (B) 1/p
      (C) 1/V		                                       (D) p/V

76.   Which of the following does not change during a throttling process?
      (A) enthalpy
      (B) entropy
      (C) volume
      (D) pressure

77.   Heat transferred to a system at a constant pressure is equal to
      (A) Work transfer
      (B) Change in internal energy
      (C) Change in enthalpy
      (D) Change in entropy

78.   What is the percentage of oxygen by volume in the atmosphere?
      (A) 14%		                                       (B) 23%
      (C) 20.9%		                                     (D) 79%

79.   Good fuel is
      (A) Readily available
      (B) Cheap
      (C) Easily Burnt in air
      (D) All of the above

80.   Incomplete combustion gives
      (A) CO2
      (B) CO
      (C) Carbon
      (D) None of the above

81.   In a gas power plant, which of the following is used to produce shaft power?
      (A) The pressure and kinetic energy of stored water
      (B) Heat energy of water
      (C) Heat energy of flue gas
      (D) Nuclear energy


12 | [BKQ]                                                                           [Contd.
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82.	The latent heat of steam at pressures greater than atmospheric pressure is __________ than the
     latent heat of steam at atmospheric pressure
      (A) Less
      (B) More
      (C) Equal
      (D) None of the above

83.   Heating of dry steam above saturation temperature is known as
      (A) enthalpy
      (B) superheating
      (C) supersaturating
      (D) None of the above

84.   Superheating of steam is done at
      (A) Constant volume		                          (B) Constant pressure
      (C) Constant enthalpy		                        (D) Constant entropy

85.   On Mollier chart, the constant pressure lines
      (A) Diverge from left to right
      (B) Diverge from right to left
      (C) First rise up and then fall
      (D) None of the above

86.   On Mollier diagram, throttling process is represented by
      (A) Horizontal straight line
      (B) Vertical straight line
      (C) Curved line
      (D) None of the above

87.   The power available at the shaft of an I.C. engine is known as
      (A) Brake horsepower
      (B) Indicated horsepower
      (C) Friction power
      (D) None of the above

88.	In a two-stroke engine, the number of revolutions of the crankshaft for completion of a working
     cycle is
      (A) One		                                      (B) Two
      (C) Three		                                    (D) Four


[BKQ]                                                                                  P.T.O.] | 13
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89.   Thermal efficiency of two-stroke engine in comparison with four-stroke engine is
      (A) More		                                          (B) Same
      (C) Less		                                          (D) None of the above

90.   In four-stroke petrol engine,
      (A) The intake valve closes after top dead center
      (B) The intake valve closes after bottom dead center
      (C) The exhaust valve opens after top dead center
      (D) The exhaust valve closes after bottom dead center

91.   In C.I. engines, the combustion is
      (A) homogeneous
      (B) heterogeneous
      (C) both homogeneous and heterogeneous
      (D) none of the above

92.   Morse test is conducted on
      (A) Vertical engines
      (B) Horizontal engines
      (C) Single cylinder engines
      (D) Multi-cylinder engines

93.   Heat transfer takes place as per
      (A) Zeroth law of thermodynamics
      (B) First law of thermodynamics
      (C) Second law of thermodynamics
      (D) All of the above

94.   The capacity of a refrigerating machine is expressed as
      (A) Inside volume of cabinet
      (B) Lowest temperature attained
      (C) Gross weight of machine in tons
      (D) Rate of abstraction of heat from the space being cooled

95.   One ton of refrigeration is equivalent to
      (A) 1 kW		                                          (B) 2.5 kW
      (C) 3.5 kW		                                        (D) 5 kW

96.   The stress-strain relation of the Newtonian fluid is
      (A) Linear		                                        (B) Parabolic
      (C) Hyperbolic		                                    (D) None of the options


14 | [BKQ]                                                                               [Contd.
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97.   Cavitation will begin when
      (A) the pressure at any location reaches an absolute pressure equal to the saturated vapor pressure
           of the liquid
      (B) the pressure becomes more than the critical pressure
      (C) the flow is increased
      (D) the pressure is increased

98.   Bernoulli`s theorem deals with the conservation of
      (A) mass		                                       (B) force
      (C) momentum		                                   (D) energy

99.   Specific speed of a turbine depends on
      (A) Speed, power and discharge
      (B) Discharge and power
      (C) Speed and head
      (D) Speed, power and head

100. An impulse turbine
      (A) Operates submerged
      (B) Requires draft tube
      (C) Is not exposed to atmosphere
      (D) Operates by an initial complete conversion to kinetic energy

101. Impulse turbine is used for
      (A) Low head		                                   (B) High head
      (C) Medium head		                                (D) All of the options

102. To produce a high head by multistage centrifugal pumps, the impellers are connected
      (A) both in parallel
      (B) in series
      (C) both in parallel and series
      (D) none of the above

103. The most efficient method to compress the air is
      (A) Isothermal compression
      (B) Adiabatic compression
      (C) Polytropic compression
      (D) None of the above


[BKQ]                                                                                       P.T.O.] | 15
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104. Clearance volume on a reciprocating compressor is required to
      (A) Decrease work input
      (B) Attain high volumetric efficiency
      (C) 
          Provide a cushioning effect and also to avoid mechanical bang of the piston with the
          cylinder head
      (D) None of the above

105. Volumetric efficiency is
      (A) The ratio of stroke volume to clearance volume
      (B) The ratio of air actually delivered to the amount of piston displacement
      (C) Reciprocal of compression ratio
      (D) None of the above

106. As the compression ratio increases, the volumetric efficiency of air compressor
      (A) Increases
      (B) Decreases
      (C) Remains constant
      (D) None of the above

107. It is not a conserved quantity: _________
      (A) mass		                                      (B) momentum
      (C) energy		                                    (D) exergy

108. The exergy of an isolated system in a process
      (A) Can never increase
      (B) Can never decrease
      (C) Always remain constant
      (D) None of the above

109. A humidification process means
      (A) A decrease in relative humidity
      (B) An increase in specific humidity
      (C) A decrease in temperature
      (D) An increase in temperature


16 | [BKQ]                                                                             [Contd.
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110.	In a refrigerator plant, if the condenser temperature increases, then the power input to the
      compressor will
      (A) decrease
      (B) increase
      (C) remain the same
      (D) be unpredictable

111. When the air is adiabatically saturated, the temperature attained is
      (A) Dew point temperature
      (B) Dry bulb temperature
      (C) Wet bulb temperature
      (D) Triple point temperature

112.	For a given dry bulb temperature, as the relative humidity decreases, the wet bulb temperature
      will
      (A) decrease
      (B) increase
      (C) remain the same
      (D) depend on other factors

113.	The saturation temperature at the partial pressure of water vapour in the air-water vapour
      mixture is called
      (A) Dry bulb temperature
      (B) Wet bulb temperature
      (C) Dew point temperature
      (D) Saturation temperature

114. Compressibility is the reciprocal of
      (A) Bulk modulus of elasticity
      (B) Shear modulus of elasticity
      (C) Young`s modulus of elasticity
      (D) All of the above

115. The Bourdon tubes are generally made of
      (A) copper
      (B) tin
      (C) mild steel
      (D) bronze or nickel steel


[BKQ]                                                                                  P.T.O.] | 17
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116. Which of the following is the limitation of manometers?
     (A) Fragile
     (B) Bulky and large in size
     (C) Capillary effect is created due to the surface tension of manometric fluid
     (D) All of the above

117. The point of application of the force of buoyancy on the body is known as
     (A) Centre of gravity
     (B) Centre of buoyancy
     (C) Metacentre
     (D) None of the above

118. A floating body is in stable equilibrium when
     (A) The metacentre is below its centre of gravity
     (B) The metacentre is above its centre of gravity
     (C) The metacentric height is zero
     (D) Its centre of gravity is below the centre of buoyancy

119. 	Curve which gives an instantaneous picture of the location of the fluid particles which have
       passed through a given point is
     (A) Path line
     (B) Streamline
     (C) Streak line
     (D) None of the above

120. In which of the following measuring devices is Bernoulli`s equation used?
     (A) Venturimeter
     (B) Orifice meter
     (C) Pitot tube
     (D) All of the above

121. Bingham plastic __________________.
     (A) Flows when the shear stress exceeds the yield stress
     (B) Flows when the shear stress is of smaller magnitude than the yield stress
     (C) Follows Newton`s law of viscosity
     (D) Follows power law


18 | [BKQ]                                                                                 [Contd.
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122. For pseudoplastic fluids, increase in shear rate
      (A) Increases the apparent viscosity
      (B) decreases the apparent viscosity
      (C) has no effect on the apparent viscosity
      (D) has unspecified effect

123. An increase in the speed of a centrifugal compressor for a given pressure ratio would result in
      (A) Increase of flow and increase of efficiency
      (B) decrease of flow and increase of efficiency
      (C) Increase of flow and decrease of efficiency
      (D) decrease of flow and decrease of efficiency

124.	For supplying intermittent small quantity of air at high pressure, which of the following compressor
      is well suited?
      (A) Centrifugal
      (B) Reciprocating
      (C) Axial
      (D) Screw

125. In the window air conditioner, the expansion device used is
      (A) Capillary tube
      (B) Thermostatic expansion valve
      (C) Automatic expansion valve
      (D) Float valve

126. During the chemical dehumidification process of air
      (A) Dry bulb temperature and specific humidity decreases
      (B) Dry bulb temperature increases and specific humidity decreases
      (C) Dry bulb temperature decreases and specific humidity increases
      (D) Dry bulb temperature and specific humidity increase

127. In CI engines, by increasing inlet air pressure, the knocking tendency
      (A) increases
      (B) decreases
      (C) does not effect
      (D) first decreases and then increases


[BKQ]                                                                                       P.T.O.] | 19
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128. Knocking takes place in CI engines
      (A) at the start of combustion
      (B) at the end of combustion
      (C) during combustion
      (D) none of the above

129. The measurement of frictional power by Willian's line is applicable to
      (A) SI engines at a particular speed
      (B) CI engines at a particular speed
      (C) any engine at a particular speed only
      (D) None of the above

130.	At constant speed and constant air-fuel ratio for an SI engine, the brake specific fuel consumption
      (BSFC) is
      (A) Maximum at full load
      (B) Minimum at full load
      (C) Minimum at no load
      (D) Does not depend on load

131. Sankey diagram represents
      (A) air consumption vs speed
      (B) heat balance of the engine
      (C) torque vs speed
      (D) None of the above

132. A surface is said to be gray if its properties are independent of
      (A) direction
      (B) temperature
      (C) wavelength
      (D) none of the above

133. The Grashof number is defined as the ratio of
      (A) Buoyancy to inertial forces
      (B) Buoyancy to viscous forces
      (C) Inertial to viscous forces
      (D) Buoyancy to surface tension forces


20 | [BKQ]                                                                                       [Contd.
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134. Prandtl number is the ratio of
      (A) Mass diffusivity to thermal diffusivity
      (B) Momentum diffusivity to thermal diffusivity
      (C) Thermal diffusivity to mass diffusivity
      (D) Thermal diffusivity to momentum diffusivity

135.	The rate of energy emission from the unit surface area through a unit solid angle, along a normal
      to the surface is known as
      (A) Emissivity
      (B) Transmissivity
      (C) Reflectivity
      (D) Absorptivity

136. The value of the wavelength for maximum emissive power is given by
      (A) Wienʼs Law
      (B) Planckʼs Law
      (C) Stefanʼs Law
      (D) Fourierʼs Law

137. Phenomenon of choking in compressor means
      (A) no flow of air
      (B) fixed mass flow rate regardless of pressure ratio
      (C) reducing mass flow rate with increase in pressure ratio
      (D) does not occur

138. In Rankine cycle, regeneration results in higher efficiency because
      (A) Pressure inside the boiler increases
      (B) Heat is added before steam enters the low-pressure turbine
      (C) Average temperature of heat addition in the boiler increases
      (D) Total work delivered by the turbine increases

139. Venturi in the carburetor results in
      (A) increase of air velocity
      (B) decrease of air velocity
      (C) decrease of fuel flow
      (D) none of the above


[BKQ]                                                                                    P.T.O.] | 21
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140. The desirable characteristics of the combustion chamber for SI engines to avoid knock is
      (A) small bore
      (B) short ratio of flame path to bore
      (C) absence of hot surfaces in the last region of the charge
      (D) all of the options

141. Which of the following is found out by calculating the area under the stress strain graph?
      (A) Endurance		                                   (B) Toughness
      (C) Strength		                                    (D) Hardness

142. Brinell hardness test is a ___________ type of hardness measurement.
      (A) Scratch		                                     (B) Indentation
      (C) Rebound		                                     (D) None of the options

143.	__________ is a mechanical measurement that measures how resistant a material is to localized
      plastic deformation caused by mechanical indentation
      (A) Hardness
      (B) Toughness
      (C) Resilience
      (D) Malleability

144. ___________ hardness number is also called as Diamond Pyramid Hardness number (DPH).
      (A) Meyer		                                       (B) Rockwell
      (C) Brinell		                                     (D) Vickers

145.	___________ usually proceeds along characteristic crystallographic planes called cleavage planes
      and has rapid crack propagation.
      (A) Ductile fracture
      (B) Fatigue fracture
      (C) Brittle fracture
      (D) None of the above

146. The unit for stress intensity factor is _________
      (A) N.m		                                         (B) MPa
      (C) N.√m 		                                       (D) MPa.√m

147. Fatigue failure occurs due to ____________ loading.
      (A) cyclic
      (B) tensile
      (C) shearing
      (D) compressive


22 | [BKQ]                                                                                        [Contd.
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148. Magnitude of the shear stress induced in a solid shaft due to applied torque varies from
      (A) Maximum at the center to zero at circumference
      (B) Maximum at the center to minimum (non-zero) at circumference
      (C) Zero at the center to maximum at circumference
      (D) Minimum (non-zero) at center to maximum at circumference

149. Variation of the shear stress over the cross-section of a circular shaft subjected to torsion is
      (A) Linear		                                     (B) Parabolic
      (C) Hyperbolic		                                 (D) Uniform

150. For two shafts joined in series, the ____________ in each shaft is the same.
      (A) Shear stress
      (B) Angle of twist
      (C) Torque
      (D) None of the above

151.	A solid shaft of same cross-sectional area and of same material as that of a hollow shaft can resist
      ____________.
      (A) Less torque		                                (B) More torque
      (C) Equal torque		                               (D) None of the options

152. In pure bending, bending stress at neutral axis is _______________.
      (A) Maximum
      (B) Minimum
      (C) Zero
      (D) None of the above

153. A beam is said to be in pure bending if ____________.
      (A) Shear force and bending moment are uniform throughout
      (B) Shear force is zero and bending moment is constant throughout
      (C) Shear force can vary but bending moment is uniform throughout
      (D) Shear force is uniform and bending moment varies linearly

154. The bending stress (σx) in beam is less if its section modulus is ____________
      (A) High
      (B) Low
      (C) Zero
      (D) None of the above


[BKQ]                                                                                        P.T.O.] | 23
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155.	
     In simple bending of beams, the bending stress (σx) over the cross-section of the
     beam _____________.
      (A) is constant
      (B) varies linearly
      (C) varies parabolically
      (D) varies cubically

     In bending, the nature of shear stress (τxy) distribution over the cross-section of a beam
156.	
     is ________
      (A) uniform		                                   (B) linear
      (C) parabolic		                                 (D) elliptic

157.	
     Principal stresses are the normal stresses acting on the planes on which shear stress
     is _____________
      (A) maximum
      (B) minimum
      (C) zero
      (D) none of the above

158.	In plane stress, the plane of principal stress and the plane of maximum shear stress make an angle
      of __________ degrees
      (A) 45
      (B) 90
      (C) 180
      (D) 270

159.	In plane stress, the planes of maximum and minimum principal stresses are at an angle of ________
      degrees to each other
      (A) 45		                                        (B) 90
      (C) 180		                                       (D) 270

160. The bending moment at a section of loaded beam, where shear force is zero, will be _______.
      (A) zero
      (B) maximum
      (C) minimum
      (D) none of the above

161. If a member is subjected to an axial tensile load, the plane normal to the axis of loading carries
      (A) maximum normal stress                       (B) minimum normal stress
      (C) maximum shear Stress                        (D) none of the options


24 | [BKQ]                                                                                       [Contd.
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162. Which of the following can be obtained from the Mohr’s Circle?
      (A) Moment of inertia
      (B) Stiffness
      (C) Damping
      (D) Principal Stresses

163.	The ratio of the crippling load of a column having both the ends fixed to the same column having
      both the ends hinged is _______.
      (A) 4
      (B) 2
      (C) 1
      (D) 3

164.	For a simply supported beam of span L with point load W at the centre, the maximum Bending
     Moment will be

      (A) WL		                                             (B) 

      (C)     		                                           (D) 

165. Which of the following is NOT an assumption in derivation of torsion equation?
      (A) circular shaft remains circular after twisting
      (B) plane section of the shaft remains plane after twisting
      (C) material of the shaft is isotropic
      (D) angle of twist is proportional to radius

166. Maximum slope in a cantilever beam with point load at the free end will be
      (A) at the free end
      (B) at the centre
      (C) at the fixed end
      (D) none of the above

167. Deflection of a simply supported beam when subjected to central point load is given as ________.

      (A)      		                                          (B) 


      (C)       		                                         (D) 



[BKQ]                                                                                    P.T.O.] | 25
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168. The carbon percentage in AISI 1030 steel is
      (A) 30%
      (B) 3%
      (C) 0.3%
      (D) 0.03%

169. Which of the following is a non-destructive testing method?
      (A) Metallographic testing
      (B) Fatigue testing
      (C) Tensile testing
      (D) Radiography

170.	If compressive yield stress and tensile yield stress are equivalent, then the region of safety from
      maximum principal stress theory is of which shape?
      (A) Hexagon
      (B) Square
      (C) Circle
      (D) Ellipse

171. Which of the following is the characteristic of force?
      (A) Magnitude of force
      (B) Point of application of force
      (C) Direction of application of force
      (D) All of the above

172.	A struss structure is perfect, if the number of members are _________ (2j – 3) , where j is the
      number of joints.
      (A) equal to
      (B) less than
      (C) greater than
      (D) none of the above

173. The unit of work or energy in S.I. units is _________.
      (A) Newton
      (B) Pascal
      (C) Watt
      (D) Joule


26 | [BKQ]                                                                                       [Contd.
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174. The forces, which meet at one point but their lines of action do not lie in same plane are called
      (A) coplanar non-concurrent forces
      (B) non-coplanar concurrent forces
      (C) non-coplanar non-concurrent forces
      (D) parallel forces

175.	In determining forces in trusses by the method of sections, the truss is divided into two parts by
      an imaginary section drawn in such a way that it does not cut more than ______________ with
      unknown forces.
      (A) two members
      (B) three members
      (C) four members
      (D) five members

176.	Immediately after the collision, two elastic bodies attempt to regain original shape. This process of
      regaining the original shape is called __________.
      (A) elasticity
      (B) restitution
      (C) compression
      (D) conservation of momentum

177.	According to the law of conservation of momentum, the total momentum of an elastic system
      before collision is ___________ the total momentum of the system after collision.
      (A) greater than
      (B) less than
      (C) equal to
      (D) greater than or less than

178.	____________ is the branch of engineering mechanics which deals with the motion of particles and
      bodies without consideration of forces that cause them to move.
      (A) Kinematics
      (B) Kinetics
      (C) Statics
      (D) Quantum mechanics

179.	If the resultant force on a particle is zero during an interval of time, linear momentum of the
      particle _________.
      (A) increases
      (B) decreases
      (C) remains constant
      (D) increases or decreases


[BKQ]                                                                                        P.T.O.] | 27
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180.	The principle of virtual work for a rigid body in equilibrium states that the total virtual work of
      the external forces acting on the body is ________ for any virtual displacement of the body.
      (A) non-zero
      (B) zero
      (C) unstable
      (D) all of the above

181.	In a kinematic chain with four lower pairs, if two pairs are sliding pairs and the other two turning
      pairs, the mechanism is classified into
      (A) four-bar chain
      (B) single slider-crank chain
      (C) double slider-crank chain.
      (D) all of the above

182.	The velocity image of a kinematic link is a scaled reproduction of the link's shape in the velocity
      diagram from the configuration diagram, rotated through ___________ in the direction of the
      angular velocity.
      (A) 90°
      (B) 180°
      (C) 270°
      (D) None of the above

183. The axis of spin, the axis of precession and the axis of gyroscopic torque are in
      (A) two parallel planes
      (B) two perpendicular planes
      (C) three perpendicular planes
      (D) three parallel planes

184.	The governor is said to be ________ when the speed of the engine fluctuates continuously above
      and below the mean speed.
      (A) isochronous
      (B) hunting
      (C) insensitive
      (D) stable

185. In spur gears, the circle on which the involute is generated is called the
      (A) pitch circle
      (B) clearance circle
      (C) base circle
      (D) addendum circle


28 | [BKQ]                                                                                        [Contd.
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186. The relative velocity of sliding in the teeth of involute spur gears in mesh is zero at ________.
      (A) the point of engagement
      (B) the point of disengagement
      (C) the pitch point
      (D) the point between point of engagement and pitch point

187.	For which of the following planar mechanism/s, coriolis acceleration component appears in the
      acceleration analysis?
      1. Whitworth quick-return mechanism
      2. Slider-crank mechanism
      3. Scotch-Yoke mechanism
      (A) 1, 2 and 3		                                 (B) 1 and 2
      (C) 2 and 3		                                    (D) 1 only

188. In a radial cam, the follower moves in a direction
      (A) parallel to the cam axis
      (B) perpendicular to the cam axis
      (C) at an angle of 45º to the cam axis
      (D) none of the above

189.	According to Kennedy’s theorem, the instantaneous centres of three bodies having relative motion
      lie on a
      (A) curved path
      (B) straight line
      (C) point
      (D) infinite distance

190. The ratio of maximum fluctuation of speed of the flywheel to the mean speed is called
      (A) fluctuation of energy
      (B) maximum fluctuation of energy
      (C) coefficient of fluctuation of speed
      (D) none of the above

191. A reverted gear train is one in which the output shaft and input shaft _________.
      (A) rotate in opposite directions
      (B) are co-axial
      (C) are at right angles to each other
      (D) are at an angle of 45° to each other


[BKQ]                                                                                       P.T.O.] | 29
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192.	D’Alembert’s principle states that the inertia forces and couples and the external forces and
      torques on a body together give _____________.
      (A) statical equilibrium
      (B) dynamic equilibrium
      (C) unstable equilibrium
      (D) all of the above

193. ____________ is a reference point on the follower to trace the cam profile
      (A) pitch point
      (B) trace point
      (C) base point
      (D) prime point

194.	In a revolving rotor, the centrifugal force remains balanced as long as the centre of the mass of the
      rotor lies ___________
      (A) below the axis of shaft
      (B) on the axis of shaft
      (C) above the axis of shaft
      (D) away from the axis of shaft

195.	Grashof's Law states that the sum of lengths of the shortest and the longest link should be
      _________ to the sum of lengths of the other two links.
      (A) less than or equal
      (B) greater than or equal
      (C) always equal
      (D) none of the above

196.	A kinematic pair of links having surface or area contact between the members is known as a
      __________
      (A) higher pair
      (B) lower pair
      (C) redundant pair
      (D) linkage

197.	__________ motion is the most ideal program for high-speed follower motion in cam follower
      mechanism.
      (A) Simple harmonic
      (B) Constant velocity
      (C) Cycloidal
      (D) Constant acceleration and deceleration


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198. A governor with a zero speed range is known as an __________ governor.

      (A) isochronous

      (B) hunting

      (C) centrifugal

      (D) Pickering

199. The function of the universal joint is to allow the propeller shaft to ________

      (A) change the length

      (B) change the inclination

      (C) transfer the torque at an angle

      (D) none of the above

200.	If a circular chamber is introduced between the casing and the impeller of centrifugal pump, the

      casing is known as _________

      (A) volute casing

      (B) casing with guide blades

      (C) vortex casing

      (D) none of the above

                                        ______________________




[BKQ]                                                                                    P.T.O.] | 31
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             SPACE FOR ROUGH WORK




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Source: Gujarat Public Service Commission. Question paper published by Gujarat Public Service Commission.