BPSC AE 2024: Assistant Engineer (Civil/Mechanical/Electrical) (Advt. 32 and 33/2024), Paper IV General Engineering Science
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Booklet Serial No.
22/AE/CM/M –2024-04
NNN Booklet Series Question Booklet
NNN
W
NNN
NNN
GENERAL ENGINEERING SCIENCE
NNN Paper – IV Candidate’s Roll Number
Time Allowed : 01 Hour Maximum Marks : 100
Read the following instructions carefully before you begin to answer the questions.
IMPORTANT INSTRUCTIONS
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W
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1. American Public Health Association 3. Newton’s formula for convective heat
formula for aeration time (T) in hours is transfer from a fluid to a metallic wall
or from a metallic wall to a fluid is
(where, La = BOD of the aeration
tank sewage influent (mg/litre) to be (where, Q = heat transfer by convection
removed) in J/S, h = heat transfer or film
coefficient in J/m2 Cs or W/m2 C,
(A) T = (La/4) – 1 a = surface area through which heat is
transferred in m2, ts = temperature of
(B) T = (La/20) – 1 the surface or wall in ºC and
tf = temperature of the fluid in ºC)
(C) T = 2La – 1
2
(A) Q ha ( ts tf )
(D) T = (La/2) – 1
(B) Q ha( ts tf )
2. Rouse distance (x) required for (C) Q ha( ts tf )
establishment of a fully developed
(D) Q ha( t f ts )
turbulent flow in a pipe of diameter D
is given by
4. The strain energy stored in a
x spring, when subjected to maximum
(A) 50
D
load, without suffering permanent
50 distortion, is known as
(B) x D
(A) Modulus of resilience
x
(C) 50 (B) Proof resilience
D
(C) Impact energy
x 2
(D) (50)
D (D) Proof stress
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5. It is proposed that solar energy be used 8. A thin cylindrical shell of diameter (d) and
to warm a large collector plate. The thickness (t) is subjected to an internal
energy would in turn, be transferred pressure (P). The ratio of longitudinal
strain to volumetric strain is
as heat to a fluid within a heat engine,
1
and the engine would reject energy as (where, = Poisson’s ratio)
m
heat to the atmosphere having assumed
m 2
temperature of 20ºC. Experiments (A)
5m 4
indicate that about 1880 KJ/m2h of
energy can be collected when the plate 2m 1
is operating at 90ºC. The minimum (B) 2m 1
collector area that would be required for
m 1
plant producing 1 KW of useful shaft (C) 2m 1
power will be approximately
(A) 30 m2 m 2
(D)
(B) 10 m2 3m 4
(C) 20 m2
(D) 15 m2 9. Air at a temperature of 15ºC passes
through a heat exchanger at a velocity
6. Which one of these joints are not used of 30 m/s where its temperature is
in C.I. pipes ?
raised to 800ºC. It then enters a turbine
(A) Simplex joint
with the same velocity of 30 m/s and
(B) Flanged joint
expands until the temperature falls to
(C) Spigot and socket joint
650ºC. On leaving the turbine, the air is
(D) Tyton joint
taken at a velocity of 60 m/s to a nozzle,
where it expands until the temperature
7. The strength of current in 2 H inductor has fallen to 500ºC. If the air flow rate
changes at a rate of 3 A/s. The voltage is 2 kg/s, the rate of heat transfer to the
across it and the magnitude of energy
air in the heat exchanger, by taking the
stored in the inductor after 4 seconds
enthalpy of air as h = Cpt, where Cp is
are
the specific heat equal to 1.005 KJ/Kg
(A) VL = 1.5 V; WL = 144 J and t being the temperature, is
(B) VL = 6 V; WL = 72 J (A) 4500 KJ/sec
(B) 1300 KJ/sec
(C) VL = 6 V; WL = 144 J
(C) 1580 KJ/sec
(D) VL = 1.5 V; WL = 12 J (D) 1050 KJ/sec
22/AE/CM/M– 2024-04/W 3 [ P.T.O.
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10. The net heat transfer by radiation from 12. In the case of Rankine cycle, the
a body at temperature (T1) to another specific volume of water in the pump is
body or surrounding at temperature ___________ of the steam expanding in
(T2) is given by
the same turbine.
(where, = Radiation constant for a
perfect black body and = Emissivity (A) Much less than that
of a body at a particular temperature)
(B) Equal to
4 4 2
(A) Q T1 T2 W m (C) Much more than that
1
4 4 2 (D) Not related to that
(B) Q 2
T1 T2 W m
4 4 2
(C) Q 1
T1 T2 W m
13. Theoretical power required to drive a
2 2 2
(D) Q T1 T2 W m Single-acting Reciprocating Pump is
2
(where, is the specific weight of the
11. Y liquid, A is the cross-sectional area of
B piston or the plunger, L is the length
of the stroke, N is delivery stroke per
minute, Hs is the static head, Hd is the
30° A delivery head)
X
O
A rod AB rests with the end A on rough 2
ground and the end B against a smooth ( ALN ) ( Hs Hd )
(A) P
vertical wall. The rod is uniform and of 60
weight W. If the rod is in equilibrium
in the position shown in figure, the
( ALN )( Hs Hd )
normal reaction at B is (B) P
60
3
(A) W
2 ( ALN )( Hs Hd )
W (C) P
(B) 60
2
(C) W 2
( ALN ) ( Hs Hd )
(D) 3W (D) P
60
22/AE/CM/M–2024-04/W 4
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14. The metallic oxide used in the form of 17. For the same compression ratio, the
powder in a paint is called Brayton cycle efficiency as compared to
(A) Drier that of the Otto cycle is
(A) Greater
(B) Base
(B) Equal
(C) Extender
(C) L ess
(D) Vehicle
(D) Not related
15. The total inductance of two coils, A and
18. The hot-wire ammeter
B, when connected in series is 0.5 H
or 0.2 H, depending upon the relative (A) reads equally well on d.c. and /or a.c.
circuits
directions of the current in the coils.
Coil A, when isolated from coil B, has (B) is a high precision instrument
a self-inductance of 0.2 H. The mutual
(C) is used only for d.c. circuits
inductance between the two coils is
(D) is used only for a.c. circuits
(A) 0.05 H
(B) 0.15 H 19. PERT is
(C) 0.075 H (A) Work oriented technique
(D) 0.25 H (B) Activity oriented technique
(C) Time oriented technique
16. The loss of head due to frictional
(D) Event oriented technique
resistance due to flow of liquid in a
long straight pipe of length (L) and
diameter (D) is given by 20. A stationary mass of gas is compressed
(where, f is the friction factor of the without friction from an initial state of
pipe and V is the mean velocity of flow 0.3 m3 and 0.105 MPa to a final state
in the pipe.) of 0.15 m3 and 0.105 MPa, the pressure
fLV remaining constant throughout the
(A) process. There is a transfer of 37.6 KJ
2gD
of heat from the gas during the process.
fV 2 The internal energy of gas changes by
(B)
L 2gD
(A) –31.25 KJ
fLV 2
(C) (B) –21.85 KJ
2gD
2 (C) –37.6 KJ
(D) 2 fLV
gD (D) 15.75 KJ
22/AE/CM/M– 2024-04/W 5 [ P.T.O.
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21. To the sum of the first and the last 24. Gypsum is added in the manufacturing
of Portland Cement
ordinates, add twice the sum of the
(A) At the end of grinding the clinker
intermediate ordinates. The total into powder
sum thus obtained is multiplied by (B) During burning in the rotary kiln
the common distance between the (C) While mixing the raw material
ordinates. One-half of this product (D) At the beginning of grinding the
clinker
gives the required area. This rule of
finding the area is called
25. Mean diameter or the pitch diameter (D)
of the Pelton Wheel which rotates at N
(A) Simpson’s rule r.p.m. is given by
(where, Ku is the speed of rotation and
(B) Trapezoidal rule
H is the net head)
(C) Mid-ordinate rule
2gH
(D) Average ordinate rule (A) D 60 K u
N
22. The nodal method of circuit analysis is 2K ugH
(B) D
based on N
(A) KCL, KVL and Ohm’s Law 60 2K ugH
(C) D
N
(B) KCL and Ohm’s Law
(C) KVL and Ohm’s Law 60 K u 2gH
(D) D
(D) KCL and KVL N
23. If the cross slope of a country is 10%, 26. Relative permeability of vacuum is
the terrain is classified as 1
(A)
4
(A) Steep
(B) 1 H/m
(B) Rolling
(C) 4 10–7 H/m
(C) Plain
(D) Mountainous (D) 1
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27. When a body is subjected to bi-axial 29. If T1 is the source temperature and
stress, i.e. direct stress (P1) and (P2) T2 is the sink temperature, the more
in two mutually perpendicular planes effective way to increase the efficiency
accompanied by a simple shear of a Carnot engine is
stress (q), then maximum normal
stress is (A) Decrease T1 keeping T2 constant
(B) Increase T2 keeping T1 constant
P1 P2 1 (C) Increase T1 keeping T2 constant
(A) ( P1 P2 )2 4q 2
2 2 (D) Decrease T2 keeping T1 constant
P1 P2 1
( P1 P2 )2 4q 2
2 2 30. An angle made by a survey line with
the prolongation of the proceeding line,
P1 P2 1 is known as
( P1 P2 )2 4q 2
2 2
(A) Deflection angle
(B) Vertical angle
P1 P2 1
( P1 P2 )2 4q 2 (C) Direct angle
2 2
(D) Horizontal angle
The specific speed, (NS) of a 31. Factors not affecting bacterial efficiency
Centrifugal Pump is given by of chlorine are
(where, Hm is the available head from (A) Coagulants used
the pump and Q corresponding to the (B) Presence of metallic compounds
maximum efficiency of the pump at its (C) Turbidity
normal working speed N) (D) Ammonia compounds
Q N
(A) N S 3 32. The friction factor (f) for laminar flow
Hm4 in a pipe is given by
8
NQ (A) f
(B) N Re
S 3
Hm4
64
(B) f
N Q Re
(C) N 3
S
Hm4 64
(C) f
Re
N Q
(D) N 8
S 4
(D) f
Hm3 Re
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33. When the magnetic bearing of the 36. A particle of mass 1 kg resting on
sun at noon is 185°20', the magnetic rough contact with a plane inclined at
declination will be
30° to the horizontal is just about to
(A) 5°20' South slip. The coefficient of friction between
(B) 5°20' West the plane and the particle will be
1
(C) 5°20' East (A) 3
(D) 5°20' North 1
(B) 3
(C) 3
34. The overall efficiency of Francis
Turbine is given by (D) 2 3
(where, W is the weight of water per
37. In the given circuit, the value of I is
second which strikes the runner, P is
the power available at the runner shaft
and H is the net head at the runner
shaft)
2P
(A) o ( WH)
( WH)
(B) o P
P (A) Indeterminate
(C) o ( WH)
(B) –1 A
(C) 1 A
(2WH)
(D) o P (D) 2 A
35. A dummy activity 38. Vicat’s apparatus is used to determine the
(A) is artificially introduced (A) Initial setting time of cement
(B) does not consume time (B) Normal consistency of cement
(C) is represented by dotted lines (C) Final setting time of cement
(D) all of the above (D) All of the above
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39. For complete similarity to exist 41. The method of levelling in which the
between the model and its prototype, heights of mountains are found by
observing the temperature at which
there should be
water boils, is known as
(A) Geometric, kinematic and dynamic
similarity (A) Hypsometry
(B) Only kinematic similarity (B) Reciprocal levelling
(C) Only geometric similarity
(C) Barometric levelling
(D) Only dynamic similarity
(D) Longitudinal levelling
40.
42. Emissivity factor for the energy emitted
by a grey body is given by
(where, E = Energy emitted by a grey
body per m2 per unit time and
EB = Energy emitted by a perfect black
body per m2 per unit time)
EB E
(A)
E
EB
(B)
E
E
(C)
EB
EB E
(D)
EB
43. A tank contains oil of specific gravity
The figures show the compression of 0.9. The depth of the point below
of Otto, Diesel and Dual cycles for free surface is (where, the pressure
the same compression ratio and heat
rejection. The Otto cycle is intensity is 9 kg(f)/cm2 )
(A) 3 – 6 – 4 (A) 1 m
(B) 1 – 2 – 7 – 5 (B) 100 m
(C) 1 – 2 – 6 – 5 (C) 1000 m
(D) 1 – 2 – 3 – 4 – 5 (D) 10 m
22/AE/CM/M– 2024-04/W 9 [ P.T.O.
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44. What is the chemical composition of 47. Break-even point shows that
quicklime ? (A) Variable cost = Fixed cost
(B) Sales revenue < Total cost
(A) MgS
(C) Sales revenue > Total cost
(B) CaO (D) Sales revenue = Total cost
(C) CaS
48. Which of the following constituents,
(D) MgO when present in excess quantity,
changes the colour of the brick from
red to yellow ?
45. For prevention of dental caries in (A) Alkalis
children, the recommended fluoride (B) Silica
concentration in water should be in the (C) Alumina
range of (D) Limestone
(A) 1.7 – 2.2 49. A moving coil voltmeter measures
(A) Only a.c. voltage
(B) 0.7 – 1.2
(B) Only d.c. voltage
(C) Both a.c. and d.c. voltage
(C) 0.2 – 0.7
(D) Nothing
(D) 1.2 – 1.7
50. Dimension of circulation is
46. An object of mass 5 kg falls from rest L
(A)
through a vertical distance of 20 m and T
gains a velocity of 10 m/s. The work
2
done by the resistance of the air on the L
object will be (B)
T
(A) – 750 J L
(C) 2
(B) – 550 J T
(C) 750 J 2
L
(D) 2
(D) 550 J T
22/AE/CM/M–2024-04/W 10
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SPACE FOR ROUGH WORK 22/AE/CM/M– 2024-04/W 11 [ P.T.O.
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SPACE FOR ROUGH WORK
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Bihar Public Service Commission, Patna
Advt. No. 32/2024 & 33/2024
(General Engineering Science, Paper-IV)
Assistant Engineer, Civil & Mechanical Written (Objective)
Competitive Examinations
Final Answer Key (Set-W)
Question No. Ans. Key Question No. Ans. Key
1 B 26 D
2 C 27 C
3 Deleted 28 C
4 B 29 D
5 B 30 A
6 A 31 A
7 C 32 C
8 A 33 B
9 C 34 C
10 C 35 D
11 A 36 B
12 A 37 A
13 Deleted 38 D
14 B 39 A
15 C 40 C
16 C 41 A
Text of page 2
Question No. Ans. Key Question No. Ans. Key
17 B 42 C
18 A 43 B
19 D 44 B
20 B 45 B
21 B 46 A
22 B 47 D
23 C 48 D
24 D 49 B
25 D 50 B
Text of page 3
(Set-X)
Question No. Ans. Key Question No. Ans. Key
1 B 26 D
2 A 27 C
3 C 28 B
4 D 29 D
5 A 30 A
6 D 31 D
7 C 32 B
8 A 33 D
9 D 34 B
10 A 35 C
11 B 36 Deleted
12 D 37 D
13 B 38 D
14 Deleted 39 B
15 D 40 B
16 C 41 C
17 D 42 B
18 B 43 A
19 B 44 C
20 C 45 D
21 C 46 D
22 C 47 C
23 D 48 C
24 C 49 A
25 C 50 A
Text of page 4
(Set-Y)
Question No. Ans. Key Question No. Ans. Key
1 D 26 D
2 C 27 A
3 C 28 A
4 A 29 C
5 B 30 B
6 A 31 B
7 D 32 Deleted
8 B 33 B
9 A 34 C
10 D 35 C
11 Deleted 36 B
12 D 37 D
13 A 38 D
14 D 39 A
15 A 40 D
16 C 41 D
17 C 42 C
18 D 43 A
19 A 44 B
20 D 45 A
21 B 46 A
22 C 47 D
23 D 48 B
24 A 49 D
25 C 50 C
Text of page 5
(Set-Z)
Question No. Ans. Key Question No. Ans. Key
1 A 26 D
2 C 27 D
3 A 28 A
4 C 29 D
5 C 30 D
6 D 31 C
7 Deleted 32 A
8 C 33 Deleted
9 B 34 D
10 D 35 D
11 D 36 B
12 A 37 D
13 C 38 B
14 C 39 A
15 B 40 A
16 A 41 B
17 A 42 A
18 D 43 D
19 B 44 A
20 D 45 A
21 A 46 C
22 C 47 D
23 B 48 B
24 A 49 B
25 C 50 D
Text of page 6
Question Sequence as per Set-W
Set-W Set-X Set-Y Set-Z
3 14 32 33
6 1 50 4
13 36 11 7
17 8 35 3
19 49 8 41
23 46 6 47
24 5 36 19
31 34 17 5
Reasons as per Set-W
Q No 03 :- Deleted
Reason :- More than one option is correct.
Q.No 06 :- No change.
Reason :- Spigot and socket joint, and flanged joint are used for CI pipes. Tyton joint
is designed to be used in ductile iron pipes, but can also be used in CI
pipes. Generally simplex joint is used for asbestos cement pipe. Hence,
most appropriate option is (A) Simplex joint. (CPHEEO Manual)
Q.No 13. :- Deleted
Reason :- Option C and D has literally the same meaning.
Q. No.17 :- No Change
Reason :- For the same compression ratio, the Brayton cycle efficiency is equal to otto
cycle efficiency.
(Ref: Engineering Thermodynamics by P.K.Nag, Third edition Page no. 503)
Q.No19 :- The Provisional answer is option 'B' But the Correct answer is option 'D'.
PERT is considered an event oriented technique, it means focuses on the
Reason :- start and completion of events within project. (Ref book, Construction
planning and management by U.K. Shrivastava, Galgotia Publisher).
Q. No 23 :- No change.
Reason :- Generally plain terrain is defined as the cross slope of a country up to 10%,
where more than it can be classified as rolling terrain.
Q. No 24. :- The provisional answer is option 'A' but the Correct answer is option 'D'.
Reason :- Gypsum is added at the beginning of the grinding of clinker.
(Concrete Technology by M L Gambhir, Tata McGraw Hill,
Concrete Technology by Neville and Brooks, Pearson, Londan
Q. No 31. :- No change.
Reason :- Coagulants are primarily used to clump together suspended particles in
water, aiding in their removal through sedimentation and do not directly
impact the disinfection ability of chlorine against bacteria.
Metallic compounds, turbidity and ammonia compounds can
significantly reduce the effectiveness of chlorine molecules and preventing
them from reaching and killing bacteria.
. (Wastewater Engineering, Metcalf, TATA McGraw Hill 2003)Page 1 of 12
Source: Bihar Public Service Commission. Question paper published by Bihar Public Service Commission.