UKPSC JE 2013: Uttarakhand Combined Junior Engineer Selection Examination, JE MECHANICAL ENGINEERING (PAPER-Il)
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MECHANICAL ENGINEERiNG
PAPER-Il
1. A fly cutter is used on
(a) lathe (b) capstan lathe
(c) metal spining lathe (d) milling machine
2. The flow rate through a circular pipe is measured by
(a) Pitot tube (b) Venturimeter
(c) Orifice meter (d) both (b) and (c)
3. A pump is defined as a device which converts
(a) hydraulic energy into mechanical energy
(b) mechanical energy into hydraulic energy
(c) kinetic energy into mechanical energy
(d) None of the above
4. The following is a vertical type boiler
(a) Lancashire boiler (b) Cornish boiler
(c) Cochran boiler (d) Locomotive boiler
5. A boiler mounting used to put-off fire in the furnace when water level in the boiler falls
below a safe limit:
(a) Blow off cock (b) Stop valve
(c) Feed check valve (d) Fusible plug
6. In a Brayton cycle, the air enters the compressor at 300 °k and maximum temperature of cycle
is 1200 °k. What will be the thermal efficiency of cycle for maximum power output?
(a) 75% (b) 25%
(c) 50% (d) None of these
7. In an engine working on Otto cycle, air-fuel mixture is compressed from 400 C.C. to
100 C.C. Ify= 1.5, calculate the thermal efficiency of cycle.
(a) 50°/o (b) 55%
(c) 68% (d) None of these
S. The engine part that joins piston and piston rod is called
(a) piston crown (b) piston ring
(c) crank pin (d) gudgeon pin
9. The process of scavenging is related o
(a) two stroke engine (b) four stroke engine
(c) gas turbine (d) compressor
10. An axial flow compressor will have symmetrical blades for a degree of reaction:
(a) 25% (b) 50%
(c) 75% (d) 100%
11. The function of lubrication in engines are (b) cleaning, sealing and ncise reduction
(a) lubrication and cooling
(c) efficiency enhancement (d) both (a) and (b)
12. A reciprocating compressor having 0.20 m bore and 0.25 m stroke runs at 600 rpm. If the
actual volume delivered by compressor is 4 m3/min, its volumetric efficiency will be about
(a) 70% (b) 75%
(c) 80% (d) 85%
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13. In which cycle, all the four processes are not reversible?
(a) Carnot cycle (b) Joule cycle
(c) Vapour compression cycle (d) None of these
14. Wet compression in vapour compression cycle means
(a) presence of water in refrigerant vapour during compression
(b) presence of liquid refrigerant in refrigerant vapour during compression
(c) compression of liquid refrigerant only
(d) compression of water only
15. In an ideal vapour absorption system, the absorber pressure is equal to the pressure of
(a) generator (b) condenser
(c) evaporator (d) expansion device
16. if ha is enthalpy of dry air, h is enthalpy of water vapour and w is specific humidity, the
enthalpy of moist air will be
(a) ha +hv (b) ha +Whv
(c) hv +wha (d) h,+h/W
17. A sample of moist air is at a DBT of 25 °C, WBT of 18 °C and DPT of 13 °C and
corresponding saturation pressures of water vapour are 3.0 kPa, 2.0 kPa and 1.5 kPa
respectively. What will be the relative humidity of air?
(a) 47% (b) 50%
(c) 65% (d) None of these
18. In summer air-conditioning, the room is maintained at the following conditions:
(a) 21 °C DBT, 50% RH (b) 21 °C DBT, 60% RH
(c) 25°C DBT, 50% RH (d) 25°C DBT, 60% RH
19. If sensible heat load and latent heat load in a building are in the ratio 3:1, sensible heat
factor will be
(a) 0.67 (b) 0.33
(c) 0.75 (d) 0.25
20. The centre of pressure of a plane submerged surface
(a) should coincide with centroid of surface
(b) should cOincide with centroid of pressure prism
(c) may be above or below centroid
(d) cannot be above mentioned
21. Bernoulli's equation can be derived from
(a) Continuity equation (b) Newton's law of viscosity
(c) Reynold transport theorem (d) Euler's equation
22. If velocity of flow through a pipe is doubled, the head loss due to friction becomes
(a) two times (b) four times
(c) eight times (d) half
23. If the level of water (H) above the base point of V notch is increased by four times, the
discharge through the notch will become
(a) 4 times (b) 8 times
(c) 16 times (d) 32 times
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24. Uniform flow in a channel is characterised by
(a) the flow is uniform across the channel.
(b) the total energy remains constant along the channel.
(c) specific energy remains constant along the channel.
(d) total energy line either rises or falls depending on Froude number.
25. Of the various methods of measuring discharge through a pipe line, the one with the least
loss of energy and direct reading is by
(a) venturimeter (b) orifice meter
(c) flow nozzle (d) traversing a pitot-static probe
26. A jet of water of 0.002 m 2 area moving with a velocity of 15 rn/s strikes on a series of
blades moving with a velocity of 6 rn/s. The force exerted on the blades will be
(a) 0.18N (b) 270N
(c) 27N (d) l80N
27. If jet ratio of a Pelton turbine is 8, the number of buckets will be
(a) 8 (b) 23 (c) 19 (d) 31
28. A turbine is coupled with alternator to generate electricity. If number of pair of poles in
alternator are 6 and the frequency of electricity is 50 Hz, what should be the speed of the
turbine?
(a) 250 rpm (b) 500 rpm
(c) 1000 rpm (d) 3000 rpm
29. Following is an inward mixed flow reaction turbine:
(a) Pelton turbine (b) Francis turbine
(c) Kaplan turbine (d) None of these
30. In Kaplan turbine, the number of blades is generally
(a) 2to4 (b) 4to8
(c) 8 to 16 (d) 16 to 24
31. N.P.S.H. stands for
(a) Net Positive Supply Head (b) Net Power Supply Head
(c) Net Positive Suction Height (d) Net Positive Suction Head
32. Wet bulb depression is equal to
(a) WBT — DPT (b) DPT—WBT
(c) DBT — DPT (d) DBT—WBT
33. Air washer is a plant used for
(a) cleaning air (b) washing air
(c) year round air-conditioning (d) None of these
34. Solid solution of carbon in gamma iron is called
(a) austenite (b) sorbite
(c) troostite (d) ferrite
35. The process of increasing the thickness of a bar at the expense of its length is called
(a) drawing down (b) setting down
(c) upsetting (d) None of these
36. Welding used for production of high quality butt welds in thicker steel plates is
(a) resistance welding (b) gas welding
(c) seam welding (d) submerged arc welding
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37. Following is natural defect found in timbers: I
(a) pitch (b) hefrt shakes
(c) medulla (d) both (a) and (b)
38. The tool used for removing nails from wood is
(a) screw-driver (b) chisel
(c) pincer (d) None of these
39. In gas welding, the following type of flame is used for welding brass, bronze and gold:
(a) neutral flame (b) reducing flame
(c) oxidising flame (d) both neutral and reducing flames
40. The following type of welding is used for joining rails and heavy pipes etc:
(a) laser beam welding (b) resistance welding
(c) ultrasonic welding (d) thermit welding
41. Following is not a characteristic of powder metallurgy:
(a) complex shapes can be produced
(b) bimetallic and laminated parts can be made
(c) cost effectiveness
(d) low production rates lue to complex shapes
42. For good permeability of moulding sand, the following is not a desirable characteristics:
(a) higher percentage of silica
(b) larger grain size
(c) lower silt percentage
(d) sand mixture containing grains of all sizes
43. The correct sequence of processes for getting smooth surface is as follows:
(I Grinding, II— Honing, Ill Burnishing, IV Buffing)
- - -
(a) I—+IV--+II--III (b) I—+Il--III--9IV
(c) I—*I1--*IV--*1I1 (d) I—~1V---lII--II
44. Following type of chip is produced while machining ductile metals with extreme pressure
in cutting zone and high local temperature:
(a) continuous chip (b) continuous chip with built up edge
(c) discontinuous chip (d) discontinuous chip with built up edge
45. The value of 'n' for High Speed Steel (HSS) tool in Taylor's relation VT' = constant is in
the range
(a) 0.1 to 0.15 (b) 0.2to0.4
(c) 0.4 to 0.6 (d) None of these
46. The tool used in the shaper is a
(a) multipoint cutting tool (b) two point cutting tool
(c) single point cutting tool (d) None of these
47. Helix angle for most of the drills lies from
(a) 100 to 15° (b) 15° to 20°
(c) 20° to 24° (d) 24° to 30°
48. Select the most appropriate alternative about cutting fluids.
(a) It reduces heat generation. (b) It wash away the chips from metal.
(C) It reduces energy consumption. (d) All of these
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49. The relationship between two specific heats C and C, is
(a) =y—I (b) C — C, = R/J
(c) C — C. = J/R (d) C +
50. The efficiency of a Carnot engine depends on
(a) Type of fuel (b) Size of engine
(c) Design of engine (d) Temperature of source and sink
51. Second law of thermodynamics defines
(a) Entropy (b) Enthalpy
(c) Heat (d) Work
52. In an isothermal process, the internal energy
(a) increases (b) decreases
(c) remains constant (d) first increases then decreases
53. Maximum work is done in compressing air when the compression is done in
(a) isothermal process (b) adiabatic process
(c) polytropic process (d) None of these
54. What will be the volume of air at 327 °C if its volume at27 °C is 1.5 m3 ?
(a) 3m3 (b) l.5nf
(c) 6m3 (d) 10 iii-'
55. Reciprocating air compressor is best suited for
(a) large quantity of air at high pressure (b) small quantity of air at high pressure
(c) small quantity of air at low pressure (d) large quantity of air at low pressure
56. Losses in a centrifugal compressor are due to
(a) inlet losses (b) impeller channel losses
(c) diffuser losses (d) All of these
57. Which of the following cycles uses air as the refrigerant?
(a) Ericsson (b) Stirling
(c) Carnot (d) Bell-Coleman
58. One ton of refrigeration is equal to
(a) 210 kJ/min (b) 21 kJ/min
(c) 420 ki/min (d) 620 kJ/min
59. The refrigerant for a refrigerator should have
(a) high sensible heat (b) high total heat
(c) high latent heat (d) low latent heat
60. If a heat pump cycle operates between the condenser temperature of +27 °C and evaporator
temperature of— 23 °C, then the Carnot CoP will be
(a) 0.2 (h) 1.2
(c) 5 (d) 6
61. Which of the following refrigerants has lowest freezing point?
(a) Freon-12 (b) NH3
(c) CO., (d) Freon-22
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62. If P is partial pressure of water vapour in air and PS is saturation pressure of water vapour
at same temperature, then relative humidity is equal to
(a) P,/Ps (b) s'v
(c) — (d) 1 v —
63. Indication of amount of moisture in air is given by
(a) dry bulb temperature (b) wet bulb temperature
(c) dew point temperature (d) saturation temperature
64. As relative humidity decreases, the dew point will be
(a) lower than wet bulb temperature (b) higher than wet bulb temperature
(c) equal to wet bulb temperature (d) None of these
65. Sensible heat is the heat needed to
(a) Vaporise water into steam and vice versa
(b) Change the temperature of a liquid or vapour
(c) Convert water into steam and super heat it
(d) Measure dew point temperature
66. Which of the following is the unit of entropy?
(a) i/kg °k (b) Nm/kg sec
(c) J/kg (d) Nm/sec
67. The difference of pressure between the inside and outside of a liquid drop is
(a) P = T x r (b) P = T/r (c) P = T/2r (d) P = 2T/r
68. Newton's law of viscosity is a relationship between
(a) shear stress and rate of angular distortion
(b) shear stress and viscosity
(c) pressure, velocity and viscosity
(d) shear stress, pressure and rate of angular distortion
69. The curved lines on a psychrornetric chart indicates
(a) specific humidity (b) relative humidity
(c) DBT (d) WBT
70. Ratio of inertia force to surface tension is known as
(a) Mach number (b) Froude number
(c) Reynold's number (d) Weber's number
71. Friction factor of pipes depends on
(a) rate of flow (b) fluid density
(c) viscosity (d) All of these
72. Pelton wheels are used for minimum of following heads:
(a) 20m (b) l5Om
(c) 25m (d) 200 m or above
73. If 'a' is the angle of blade tip at outlet, then maximum hydraulic efficiency of an impulse
turbine is
1 + cos a I — cos a
(a) (b)
2 2
1 + sin a I — sin a
(c) (d)
2
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In blanking operation, the angle of shear is provided on
a
87.
(a) die (b) punch
(c) both on punch and die (d) None of these
88. Tool life is most affected by
(a) cutting speed (b) tool geometry
(c) feed and depth (d) None of these
89. On tool surface, crater wear occurs mainly due to
(a) abrasion (b) diffusion
(c) oxidation (d) adhesion
90. In machining process, chips break due to
(a) plasticity (b) elasticity
(c) work hardening (d) None of these
91. No cutting fluid is used while machining which metal?
(a) Mild steel (b) Carbon steel
(c) Aluminium (d) Cast iron
92. Which of the following metals can be easily drawn into wire?
(a) Tin (b) Copper
(c) Zinc (d) Cast iron
93. The composition of silver solder is
(a) silver, copper, zinc (b) silver, tin, zinc, nickel
(c) silver, nickel (d) silver, copper, nickel
94. Muntz metal contains copper and zinc in the ratio of
(a) 50: 50 (b) 40 : 60
(c) 60 : 40 (d) 80 : 20
95. In electro discharge machining the tool is made of
(a) tungsten carbide (b) diamond
(c) copper or brass (d) stainless steel
96. The cutting tool used in spark erosion machining process is called
(a) arc (b) capacitor
(c) electrode (d) dielectric
97. Anvil is made of which of the following metal?
(a) Mild steel (b) Cast steel
(c) Copper (d) Brass
98. Which of the following are discrete products?
(a) Nut (b) Bolt
(c) Screw (d) All of these
99. Which of the following are continuous products?
(a) Sheets (metallic) (b) Pipes
(c) Wire rolls (d) All of these
100. Grate is the place in the boiler where
(a) fuel is burnt
(b) pressure of steam is measured
(c) temperature of saturated steam is increased
(d) None of the above
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$01. Boiler rating is usually defined in terms of
(a) maximum temperature of steam (b) heat transfer rate kJ/hr
(c) heating surface area (d) heating output in kg/hr
$112. Thermal efficiency of an ideal diesel cycle
(a) increases with increase in cut-off ratio
(b) decreases with increase in cut-off ratio
(c) does not depend on cut-off ratio
(d) may increase or decrease with increase in cut-off ratio
$03. Chemically correct air-fuel ratio by mass for combustion of petrol is approximately
(a) 5 (b) 10
(c) 12 (d) 15
104. In magneto ignition system, as the engine speed increases, the value of current
(a) increases (b) decreases
(c) remains the same (d) may increase or decrease
$05. If the temperature of intake air in an L.C. engine is lowered, its efficiency will
(a) increase
(b) decrease
(c) remains unchanged
(d) will increase upto certain limit and then decrease
106. In a gas turbine cycle with regeneration
(a) pressure ratio increases (b) work output decreases
(c) thermal etTiciency increases (d) heat input increases
107. The term 'priming' in boiler is associated with
(a) removal of air from the boiler shell (b) water particles being carried by steam
(c) firing of boiler (d) control of rate of fuel consumption
$00. Compression ratio in 1.C. engine is defined as the ratio of
(a) total cylinder volume to swept volume
(b) total cylinder volume to clearance volume
(C) swept volume to clearance volume
(d) None of the above
$09. Higher octane rating for Si. engine fuel indicates that it has
(a) higher calorific value (b) higher volatility
(c) higher ignition lag (d) lower ignition lag
110. Air standard efficiency of an Otto cycle having compression ratio of 5 will be
(a) 1 _5H (b) 1— l/5Y
(c) I ± l/5 (d) None of these
Ill. Most important property of I.C. engine lubricant is
(a) density (b) viscosity
(c) thermal conductivity (d) None of these
$12. The throttling operation in a domestic refrigerator is carried out in
(a) evaporator (b) capillary tube
(c) expansion valve (d) condenser
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113. Household refrigerators operate on
(a) reversed Carnot cycle (b) cascade effigeration cycle
(c) vapour absorption cycle (d) vapour compression cycle
114. When water — Lithium Bromide is used in a vapour absorption refrigeration system, then
(a) they together act as refrigerant. (b) water is the refrigerant.
(c) lithium bromide is refrigerant. (d) None of these
115. For saturated air, the dew point temperature is
(a) equal to WBT (b) less than WBT
(c) more than WBT (d) None of these
116. Process of sensible heating
(a) increases specific humidity (b) decreases specific humidity
(c) decreases relative humidity (d) increases relative humidity
117. Psychrometer is a device which is used to measure
(a) dry bulb temperature'
(b) wet bulb temperature
(c) dry bulb and wet bulb temperature simultaneously
(d) dew-point
118. In vapour absorption refrigeration, heat is rejected in
(a) condenser only (b) generator only
(c) absorber only (d) both condenser and absorber
119. A heat pump working on a reversed Carnot cycle has a CoP of 4. It is made to work as
refrigerator with 1 kW work input. The refrigerating effect will be
(a) 1 (b) 2
(c) 3 (d) 4
120. In conventional refrigerants, which element is responsible for ozone depletion?
(a) Chlorine (b) Carbon
(c) Hydrogen (d) Fluorine
121. Bernoulli's equation refers to conservation of
(a) mass (b) energy
(c) momentum (d) None of these
122. FaIling drops of water become spherical in shape due to the property of
(a) adhesion (b) cohesion
(c) surface tension (d) viscosity
123. The pressure at a depth of 5 km below the surface of the sea water, considering sp. gravity
of water to be 1.3, will be
(a) 63765 Pa (b) 637650 Pa
(c) 1.27 x 108 Pa (d) 1.27 X i0 Pa
124. The velocity of liquid flowing through the divergent portion of a venturimeter'
(a) increases (b) decreases
(c) remains constant (d) cannot be predicted
125. The shear stress at a point 5 cm from the pipe axis is 20 Pa. The value of shear stress at the
pipe wall, having diameter 20 cm will be
•(a) 40 Pa (b) 80 Pa
(c) 50 Pa (d) cannot be determined
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126. The value of velocity ratio for Kaplan turbine is about
(a) 0.5 (b) 0.9
(c) 1.5 (d) 2.0
127. Which of the following turbine does not require draft tube?
(a) Kaplan turbine (b) Pelton turbine
(c) Francis turbine (d) Propeller turbine
128. The vanes of centrifugal pumps are usually
(a) curved forward (b) curved backward
(c) radial (d) None of these
129. Notch is a device used for the measurement of
(a) rate of flow through pipes (b) rate of flow through small channel
(c) velocity through pipes (d) velocity through small channels
130. In centrifugal pump, the liquid enters
(a) at the centre (b) at the bottom
(c) at the top (d) from sides
131. Francis tiirbine is used when the available head of water range in
(a) 0— 25 rn (b) 60 — 250 m
(c) above 250 m (d) can be used for any head
132. Copper sheets are manufactured by process of
(a) drawing (b) rolling
(c) extruding (d) hammering
133. Dies for wire drawing are made of the following material:
(a) cast iron (b) wrought iron
(c) mild steel (d) carbides
134. The type of welding used for car bodies is
(a) resistance welding (b) gas welding
(c) arc welding (d) None of these
135. Commonly used flame in gas welding is
(a) neutral (b) oxidising
(c) carburising (d) None of these
136. Which of the following sands is used to keep away the green sand from sticking to the
pattern?
(a) Core sand (b) Parting sand
(c) Loam sand (d) Synthetic sand
137. Sprue in casting refers to
(a) gate (b) runner
(c) riser (d) vertical passage
138. The main function of cutting fluid is to
(a) wash away the chips (b) provide lubrication
(c) cool the tool and workpiece (d) All of these
139. In which of the following operation on lathe, spindle speed is minimum?
(a) Knurling (b) Taper turning
(c) Fine finishing (d) Thread cutting
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140. The size of shaper is specified by
(a) length of stroke (b) size otool
(c) ratio of forward to return stroke (d) size of table
141. Enlarging of an existing circular hole with a rotating single point tool is called
(a) boring (b) drilling
(c) reaming (d) internal turning
142. Which of the following material is used as binding material for grinding wheels?
(a) Silicon carbide (b) Sodium silicate
(c) Boron carbide (d) Aluminium oxide
143. The cutting edges of a standard twist drill are called
(a) cutting lip (b) flanks
(c) flutes (d) wedges
144. Which of the following is the natural abrasive?
(a) A1203 (b) SiC
(c) Boron carbide (d) Corundum
145. For which material, the cutting speed will be minimum for machining?
(a) Aluminium (b) Brass
(c) Copper (d) Cast iron
146. The purpose of using flux in soldering is to
(a) increase fluidity of solder metal
(b) prevent oxides formation
(c) wash away the surplus solder
(d) lowering the melting temperature of solder
147. In sand moulding, the middle part of flask is called
(a) cope (b) drag
(c) cheek (d) middle flask
148. Least shrinkage allowance is provided for the following:
(a) brass (b) aluminium
(c) cast iron (d) lead
149. A knee is part of the following:
(a) Shaper (b) Lathe
(c) Milling machine (d) Slotter
150. Seasoning of timber refers to
(a) removing of moisture (b) adding moisture
(c) cutting in desired shape (d) removing curves
151. Which is the hardest wood?
(a) Teak (b) Tun
(c) Shisham (d) Babul
152. Poise is the unit of
(a) mass density (b) kinematic viscosity
(c) dynamic viscosity (d) velocity gradient
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153. Continuity equation can take the form
(a) A1 v1 A,v, - (b) p1 A1 =p7 A2
(c) p1 A1 v1 p,A7 v; (d) None of these
154. Two stroke engines have
(a) valves (b) ports
(c) both (a) & (b) (d) None of these
155. Compression ratio of diesel engine is in the range of
(a) 8to 10 (b) lOto 15
(c) 16 to 20 (d) None of these
156. Steam turbines are governed by the following methods:
(a) Throttle governing (b) Nozzle control governing
(c) By-pass governing (d) All of these
157. For Parson's reaction steam turbine, degree of reaction is
(a) 75% (b) 100%
(c) 50% (d) 60%
158. Boiler mountings are necessary for
(a) operation and safety of a boiler (b) increase the efficiency of boiler
(c) both (a) and (b) (d) None of these
159. Babcock & Wilcox boiler is
(a) water tube type (b) fire tube type
(c) both (a) and (b) (d) None of these
160. Range of high pressure boilers are
(a) below 80 bar (b) above 80 bar
(c) 40to80bar (d) 60 to 80 bar
161. Dry ice is
(a) free from water (b) free from dissolved air or gases
(c) does not contain impurities (d) solidified form of carbon dioxide
162. A simple pitot tube is used to measure
(a) pressure in a static fluid (b) velocity in a flowing stream
(c) total pressure (d) dynamic pressure
163. The boundary layer on a flat plate is called laminar boundary layer if
(a) Re is less than 2000 (b) Re is less than 4000
(c) Re is less than 5 x iø (d) None of these
164. Capillary action is due to the
(a) viscosity of liquid (b) cohesion of liquid particles
(c) surface tension (d) None of these
165. Cavitation is caused by
(a) high velocity (b) low barometric pressure
(C) high pressure (d) low pressure
166. Power required to drive a centrifugal pump is proportional to
(a) Speed (N) (b) N2
(c) N3 (d) I/N2
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167. Continuous chip may be formed while machining
(a) brittle material (b) hard material
(c) tough material (d) ductile material
168. In which type of welding, molten metal is poured for joining the metals?
(a) Arc welding (b) Thermit welding
(c) MIG . (d) TIG
169. Grey iron is usually welded by
(a) Arc welding (b) Gas welding
(c) TIG. (d) M1G
170. The process of cutting thin gears from metal sheet is known as
(a). extruding (b) stamping
(c) sintering (d) rolling
171. Which wood can be used for making patterns?
(a) Mahogany (b) Pine wood
(c) . Teak wood (d) Any of these
172. Cohesiveness of sand depends on
(a) grain size and shape of sand particles (b) bounding material
(c) moisture content (d) All of these
173. Electronic ôomponents are often joined by
(a) adhesive (b) soldering
(c) brazing (d) welding
174. Which of the following is basically a polishing operation?
(a) Soft grinding (b) Lapping
(c) Honing (d) Buffing
175. The depth of cut depend on the
(a) cutting speed (b) tool material
(c) rigidity of machine tool (d) All of these
176. The commonly used material for thermocouples is
(a) chromel — copper (b) chromel — alumel
(c) platinum — rhodium . (d) Any of these
177. The gases used in tungsten inert gas welding are
(a) helium and neon (b) argon and helium
(c) ozone and neon (d) None of these
178. The chemical formulae for Freon — 12 is
(a) CHCIF2 (b) CH3CI
(c) LCC12F2 (d) . None of these
179. The function of a regenerator in a gas turbine is to
(a) reduce heat loss in exhaust (b) permit use of higher compression ratio
(c) improve thermal efficiency (d) None of these
180. The.bottom ring on the piston is known as
(a) oil ring . (b) scraper ring
(c) compression ring (d) groove ring
Series-D . 28 KAU-06
Text of page 29
Space For Rough Work / fTP1W Series-D 30 KAU-06
Text of page 30
0 Space For Rough Work /TiTtT1T KAU-06 31 Series-U
Text of page 31
Space For Rough Work Series-fl 32 KAU-06
Official key not published for this paper.
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Source: Uttarakhand Public Service Commission. Question paper published by Uttarakhand Public Service Commission.