NPCIL Online Practice Test For Mechanical
Nuclear Power Corporation of India Limited (NPCIL) Conducts Executive Trainees (ET) Test Every Year for Recruitment of Executive Engineers.
This Online Test is Free, Candidate may participate in this test and know their weakness/Strength towards Preparation for this Examination.
Contents
 1 NPCIL ( Executive Trainee for Engineers)  Mechanical
 1.1 Best of Luck Guys !!!!
 1.1.1 Results
 1.1.2 Categories
 1.1.2.1 1. Question
 1.1.2.2 2. Question
 1.1.2.3 3. Question
 1.1.2.4 4. Question
 1.1.2.5 5. Question
 1.1.2.6 6. Question
 1.1.2.7 7. Question
 1.1.2.8 8. Question
 1.1.2.9 9. Question
 1.1.2.10 10. Question
 1.1.2.11 11. Question
 1.1.2.12 12. Question
 1.1.2.13 13. Question
 1.1.2.14 14. Question
 1.1.2.15 15. Question
 1.1.2.16 16. Question
 1.1.2.17 17. Question
 1.1.2.18 18. Question
 1.1.2.19 19. Question
 1.1.2.20 20. Question
 1.1.2.21 21. Question
 1.1.2.22 22. Question
 1.1.2.23 23. Question
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 1.1.2.30 30. Question
 1.1.2.31 31. Question
 1.1.2.32 32. Question
 1.1.2.33 33. Question
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 1.1.2.35 35. Question
 1.1.2.36 36. Question
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 1.1.2.39 39. Question
 1.1.2.40 40. Question
 1.1.2.41 41. Question
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 1.1.2.60 60. Question
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 1.1.2.62 62. Question
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 1.1.2.64 64. Question
 1.1.2.65 65. Question
 1.1.2.66 66. Question
 1.1.2.67 67. Question
 1.1.2.68 68. Question
 1.1.2.69 69. Question
 1.1.2.70 70. Question
 1.1.2.71 71. Question
 1.1.2.72 72. Question
 1.1.2.73 73. Question
 1.1.2.74 74. Question
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 1.1.2.76 76. Question
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 1.1.2.90 90. Question
 1.1.2.91 91. Question
 1.1.2.92 92. Question
 1.1.2.93 93. Question
 1.1.2.94 94. Question
 1.1.2.95 95. Question
 1.1.2.96 96. Question
 1.1.2.97 97. Question
 1.1.2.98 98. Question
 1.1.2.99 99. Question
 1.1.2.100 100. Question
NPCIL ( Executive Trainee for Engineers)  Mechanical
Quizsummary
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Information
Engineer Trainee exam of NPCIL has 100 questions which needs to be answered in 120 minutes.
GENERAL GUIDELINES REGARDING NPCIL ( Executive Trainee for Engineers) – Mechanical :
 All 100 questions are from core technical subjects.
 No aptitude, english and GS is asked.
 No calculator is allowed. ( which means the questions are basic without heavy calculations )
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 Answered
 Review
 Question 1 of 100
1. Question
1 pointsThe hot tearing in a metal casting is due to
 Question 2 of 100
2. Question
1 pointsThe process utilizing mainly thermal energy for removing material is
 Question 3 of 100
3. Question
1 pointsThe part of a gating system which regulates the rate of pouring of molten metal is
 Question 4 of 100
4. Question
1 pointsThe nontraditional machining process that essentially requires vacuum is
 Question 5 of 100
5. Question
1 pointsIn an orthogonal cutting process the tool used has rake angle of zero degree. The measured cutting
force and thrust force are 500 N and 250 N, respectively. The coefficient of friction between the
tool and the chip is  Question 6 of 100
6. Question
1 pointsThe welding process which uses a blanket of fusible granular flux is
 Question 7 of 100
7. Question
1 pointsThe following data is applicable for a turning operation. The length of job is 900 mm, diameter of
job is 200 mm, feed rate is 0.25 mm/rev and optimum cutting speed is 300 m/min. The machining
time (in min) is  Question 8 of 100
8. Question
1 pointsIn an ultrasonic machining (USM) process, the material removal rate (MRR) is plotted as a function
of the feed force of the USM tool. With increasing feed force, the MRR exhibits the following
behavior:  Question 9 of 100
9. Question
1 pointsInternal gears are manufactured by
 Question 10 of 100
10. Question
1 pointsUnder certain cutting conditions, doubling the cutting speed reduces the tool life to (1/16) of the original. Taylor’s tool life index (n) for this toolworkpiece combination will be
 Question 11 of 100
11. Question
1 pointsIn a linear arc welding process, the heat input per unit length is inversely proportional to
 Question 12 of 100
12. Question
1 pointsThe function of interpolator in a CNC machine controller is to
 Question 13 of 100
13. Question
1 pointsThe primary mechanism of material removal in electrochemical machining (ECM) is
 Question 14 of 100
14. Question
1 pointsWhich one of the following statements is TRUE?
 Question 15 of 100
15. Question
1 pointsWhich two of the following joining processes are autogeneous?
(i) Diffusion welding
(ii) Electroslag welding
(iii) Tungsten inert gas welding
(iv) Friction welding  Question 16 of 100
16. Question
1 pointsFor a floating body, buoyant force acts at the
 Question 17 of 100
17. Question
1 pointsThe volumetric flow rate (per unit depth) between two streamlines having stream functions Ѱ1 and
Ѱ2 is  Question 18 of 100
18. Question
1 pointsGrashof number signifies the ratio of
 Question 19 of 100
19. Question
1 pointsConsider fully developed flow in a circular pipe with negligible entrance length effects. Assuming the mass flow rate, density and friction factor to be constant, if the length of the pipe is doubled and the diameter is halved, the head loss due to friction will increase by a factor of
 Question 20 of 100
20. Question
1 pointsThe Blasius equation related to boundary layer theory is a
 Question 21 of 100
21. Question
1 pointsWithin a boundary layer for a steady incompressible flow, the Bernoulli equation
 Question 22 of 100
22. Question
1 pointsCouette flow is characterized by
 Question 23 of 100
23. Question
1 pointsFor a completely submerged body with centre of gravity ‘G’ and centre of buoyancy ‘B’, the
condition of stability will be  Question 24 of 100
24. Question
1 pointsFor laminar forced convection over a flat plate, if the free stream velocity increases by a factor of 2, the average heat transfer coefficient
 Question 25 of 100
25. Question
1 pointsThe difference in pressure (in N/m2) across an air bubble of diameter 0.001 m immersed in water (surface tension = 0.072 N/m) is
 Question 26 of 100
26. Question
1 pointsConsider the turbulent flow of a fluid through a circular pipe of diameter, D. Identify the correct
pair of statements.
I. The fluid is wellmixed
II. The fluid is unmixed
III. Reynolds No < 2300 IV. Reynolds No > 2300  Question 27 of 100
27. Question
1 pointsA flow field which has only convective acceleration is
 Question 28 of 100
28. Question
1 pointsFor a ductile material, toughness is a measure of
 Question 29 of 100
29. Question
1 pointsIn order to have maximum power from a Pelton turbine, the bucket speed must be
 Question 30 of 100
30. Question
1 pointsIn a laminar developing flow through a pipe with constant wall temperature, the magnitude of the pipe wall inner surface convective heat transfer coefficient shall be maximum at the:
 Question 31 of 100
31. Question
1 pointsA cantilever beam having square crosssection of side a is subjected to an end load. If a is increased
by 19%, the tip deflection decreases approximately by  Question 32 of 100
32. Question
1 pointsThe spring constant of a helical compression spring DOES NOT depend on
 Question 33 of 100
33. Question
1 pointsWhich of the following statements are TRUE with respect to heat and work?
(i) They are boundary phenomena
(ii) They are exact differentials
(iii) They are path functions  Question 34 of 100
34. Question
1 pointsConsider two hydraulic turbines having identical specific speed and effective head at the inlet. If
the speed ratio (N1/N2) of the two turbines is 2, then the respective power ratio (P1/P2)
is  Question 35 of 100
35. Question
1 pointsThe INCORRECT statement about regeneration in vapor power cycle is that
 Question 36 of 100
36. Question
1 pointsThe “Jominy test” is used to find
 Question 37 of 100
37. Question
1 pointsA shaft with a circular crosssection is subjected to pure twisting moment. The ratio of the
maximum shear stress to the largest principal stress is  Question 38 of 100
38. Question
1 pointsA thin cylindrical pressure vessel with closedends is subjected to internal pressure. The ratio of
circumferential (hoop) stress to the longitudinal stress is  Question 39 of 100
39. Question
1 pointsAssuming constant temperature condition and air to be an ideal gas, the variation in atmospheric
pressure with height calculated from fluid statics is  Question 40 of 100
40. Question
1 pointsThe internal energy of an ideal gas is a function of
 Question 41 of 100
41. Question
1 pointsThe heat removal rate from a refrigerated space and the power input to the compressor are 7.2 kW
and 1.8 kW, respectively. The coefficient of performance (COP) of the refrigerator is  Question 42 of 100
42. Question
1 pointsI n a singlechannel queuing model, the customer arrival rate is 12 per hour and the serving rate is
24 per hour. The expected time that a customer is in queue(in min) is  Question 43 of 100
43. Question
1 pointsThe static deflection of a spring under gravity, when a mass of 1 kg is suspended from it, is 1 mm.
Assume the acceleration due to gravity g =10 m/s2. The natural frequency of this springmass
system (in rad/s) is  Question 44 of 100
44. Question
1 pointsWhich of the bearings given below SHOULD NOT be subjected to a thrust load?
 Question 45 of 100
45. Question
1 pointsThe INCORRECT statement about the characteristics of critical point of a pure substance is that
 Question 46 of 100
46. Question
1 pointsF or a heat exchanger, ΔTmax is the maximum temperature difference and ΔTmin is the minimum
temperature difference between the two fluids. LMTD is the log mean temperature difference. Cmin
and Cmax are the minimum and the maximum heat capacity rates. The maximum possible heat
transfer (Qmax) between the two fluids is  Question 47 of 100
47. Question
1 pointsIn PERT chart, the activity time distribution is
 Question 48 of 100
48. Question
1 pointsFor flow of viscous fluid over a flat plate, if the fluid temperature is the same as the plate temperature, the thermal boundary layer is
 Question 49 of 100
49. Question
1 pointsFor an ideal gas with constant values of specific heats, for calculation of the specific enthalpy,
 Question 50 of 100
50. Question
1 pointsConsider a steel (Young’s modulus E = 200 GPa) column hinged on both sides. Its height is 1.0 m and crosssection is 10 mm × 20 mm. The lowest Euler critical buckling load (in N) is
 Question 51 of 100
51. Question
1 pointsWhich one of the following is the most conservative fatigue failure criterion?
 Question 52 of 100
52. Question
1 pointsA rod is subjected to a uniaxial load within linear elastic limit. When the change in the stress is 200 MPa, the change in the strain is 0.001. If the Poisson’s ratio of the rod is 0.3, the modulus of rigidity (in GPa) is
 Question 53 of 100
53. Question
1 pointsA gas is stored in a cylindrical tank of inner radius 7 m and wall thickness 50 mm. The gage pressure of the gas is 2 MPa. The maximum shear stress (in MPa) in the wall is
 Question 54 of 100
54. Question
1 pointsIn a springmass system, the mass is m and the spring constant is k. The critical damping coefficient of the system is 0.1 kg/s. In another springmass system, the mass is 2m and the spring constant is 8k. The critical damping coefficient (in kg/s) of this system is
 Question 55 of 100
55. Question
1 pointsThe uniaxial yield stress of a material is 300 MPa. According to von Mises criterion, the shear yield stress (in MPa) of the material is
 Question 56 of 100
56. Question
1 pointsWhich of the following statements regarding a Rankine cycle with reheating are TRUE?
(i) increase in average temperature of heat addition
(ii) reduction in thermal efficiency
(iii) drier steam at the turbine exit  Question 57 of 100
57. Question
1 pointsThe COP of a Carnot heat pump operating between 6 °C and 37 °C is
 Question 58 of 100
58. Question
1 pointsThe atomic packing factor for a material with body centered cubic structure is
 Question 59 of 100
59. Question
1 pointsDuring the development of a product, an entirely new process plan is made based on design logic, examination of geometry and tolerance information. This type of process planning is known as
(A) retrieval
(B) generative
(C) variant
(D) group technology based  Question 60 of 100
60. Question
1 pointsAnnual demand of a product is 50000 units and the ordering cost is Rs. 7000 per order. Considering the basic economic order quantity model, the economic order quantity is 10000 units. When the annual inventory cost is minimized, the annual inventory holding cost (in Rs.) is
 Question 61 of 100
61. Question
1 pointsThe strain hardening exponent n of stainless steel SS 304 with distinct yield and UTS values undergoing plastic deformation is
 Question 62 of 100
62. Question
1 pointsIn a machining operation, if the generatrix and directrix both are straight lines, the surface obtained is
 Question 63 of 100
63. Question
1 pointsIn full mould (cavityless) casting process, the pattern is made of
 Question 64 of 100
64. Question
1 pointsIn the notation (a/b/c) : (d/e/f) for summarizing the characteristics of queueing situation, the letters ‘b’ and ‘d’ stand respectively for
 Question 65 of 100
65. Question
1 pointsThe ratio of momentum diffusivity (ν) to thermal diffusivity (α), is called
 Question 66 of 100
66. Question
1 pointsA cylindrical tank with closed ends is filled with compressed air at a pressure of 500 kPa. The inner radius of the tank is 2 m, and it has wall thickness of 10 mm. The magnitude of maximum inplane shear stress (in MPa) is
 Question 67 of 100
67. Question
1 pointsWhich of the following statements are TRUE for damped vibrations?
P. For a system having critical damping, the value of damping ratio is unity and system does not undergo a vibratory motion.
Q. Logarithmic decrement method is used to determine the amount of damping in a physical system.
R. In case of damping due to dry friction between moving surfaces resisting force of constant magnitude acts opposite to the relative motion.
S. For the case of viscous damping, drag force is directly proportional to the square of relative velocity.  Question 68 of 100
68. Question
1 pointsA circular rod of length ‘L’ and area of crosssection ‘A’ has a modulus of elasticity ‘E’ and
coefficient of thermal expansion ‘α’. One end of the rod is fixed and other end is free. If the
temperature of the rod is increased by ΔT, then  Question 69 of 100
69. Question
1 pointsCritical damping is the
 Question 70 of 100
70. Question
1 pointsA circular object of radius r rolls without slipping on a horizontal level floor with the centre having velocity V. The velocity at the point of contact between the object and the floor is
 Question 71 of 100
71. Question
1 pointsFor the given statements:
I. Mating spur gear teeth is an example of higher pair
II. A revolute joint is an example of lower pair.Indicate the correct answer
 Question 72 of 100
72. Question
1 pointsBiot number signifies the ratio of
 Question 73 of 100
73. Question
1 pointsThe maximum theoretical work obtainable, when a system interacts to equilibrium with a reference
environment, is called  Question 74 of 100
74. Question
1 pointsWhich one of the following is a CFC refrigerant?
 Question 75 of 100
75. Question
1 pointsThe jobs arrive at a facility, for service, in a random manner. The probability distribution of number
of arrivals of jobs in a fixed time interval is  Question 76 of 100
76. Question
1 pointsIn exponential smoothening method, which of the following is true?
 Question 77 of 100
77. Question
1 pointsFor machining a rectangular island represented by coordinates P(0,0), Q(100,0), R(100,50) and
S(0,50) on a casting using CNC milling machine, an end mill with a diameter of 16 mm is used.
The trajectory of the cutter centre to machine the island PQRS is  Question 78 of 100
78. Question
1 pointsWhich one of the following instruments is widely used to check and calibrate geometric features of
machine tools during their assembly?  Question 79 of 100
79. Question
1 pointsThe major difficulty during welding of aluminium is due to its
 Question 80 of 100
80. Question
1 pointsThe process of reheating the martensitic steel to reduce its brittleness without any significant loss in
its hardness is  Question 81 of 100
81. Question
1 pointsIn solidstate welding, the contamination layers between the surfaces to be welded are removed by
 Question 82 of 100
82. Question
1 pointsIn vibration isolation, which one of the following statements is NOT correct regarding Transmissibility (T)?
 Question 83 of 100
83. Question
1 pointsIn a structure subjected to fatigue loading, the minimum and maximum stresses developed in a cycle are 200 MPa and 400 MPa respectively. The value of stress amplitude (in MPa) is
 Question 84 of 100
84. Question
1 pointsIn a heat exchanger, it is observed that ΔT1 = ΔT2, where ΔT1 is the temperature difference between the two single phase fluid streams at one end and ΔT2 is the temperature difference at the other end. This heat exchanger is
 Question 85 of 100
85. Question
1 pointsIf there are m sources and n destinations in a transportation matrix, the total number of basic variables in a basic feasible solution is
 Question 86 of 100
86. Question
1 pointsA robot arm PQ with end coordinates P(0,0) and Q(2,5) rotates counter clockwise about P in the XY plane by 90°. The new coordinate pair of the end point Q is
 Question 87 of 100
87. Question
1 pointsConsider a single degreeoffreedom system with viscous damping excited by a harmonic force. At
resonance, the phase angle (in degree) of the displacement with respect to the exciting force is  Question 88 of 100
88. Question
1 pointsA mass m1 of 100 kg travelling with a uniform velocity of 5 m/s along a line collides with a
stationary mass m2 of 1000 kg. After the collision, both the masses travel together with the same
velocity. The coefficient of restitution is  Question 89 of 100
89. Question
1 pointsWhich one of following is NOT correct?
 Question 90 of 100
90. Question
1 pointsFor a gas turbine power plant, identify the correct pair of statements.
P. Smaller in size compared to steam power plant for same power output
Q. Starts quickly compared to steam power plant
R. Works on the principle of Rankine cycle
S. Good compatibility with solid fuel  Question 91 of 100
91. Question
1 pointsA source at a temperature of 500 K provides 1000 kJ of heat. The temperature of environment is
27°C. The maximum useful work (in kJ) that can be obtained from the heat source is  Question 92 of 100
92. Question
1 pointsThe number of independent elastic constants required to define the stressstrain relationship for an isotropic elastic solid is
 Question 93 of 100
93. Question
1 pointsA point mass is executing simple harmonic motion with an amplitude of 10 mm and frequency of 4 Hz. The maximum acceleration (m/s2) of the mass is
 Question 94 of 100
94. Question
1 pointsAs the temperature increases, the thermal conductivity of a gas
 Question 95 of 100
95. Question
1 pointsA reversed Carnot cycle refrigerator maintains a temperature of −5° C. The ambient air temperature is 35°C. The heat gained by the refrigerator at a continuous rate is 2.5 kJ/s. The power (in watt) required to pump this heat out continuously is
 Question 96 of 100
96. Question
1 pointsKaplan water turbine is commonly used when the flow through its runner is
 Question 97 of 100
97. Question
1 pointsMoist air at 35°C and 100% relative humidity is entering a psychrometric device and leaving at 25°C and 100% relative humidity. The name of the device is
 Question 98 of 100
98. Question
1 pointsWithin the Heat Affected Zone (HAZ) in a fusion welding process, the work material undergoes
 Question 99 of 100
99. Question
1 pointsThe principle of material removal in Electrochemical machining is
 Question 100 of 100
100. Question
1 pointsBetter surface finish is obtained with a large rake angle because