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Question Bank

Question for WBPSC AE - Quiz / Questions / MCQ in English

Last Update on : October 10, 2026

Duration: 120 · Questions: 100 · Max Marks: 100

View WBPSC Assistant Engineer 2026 Exam Page

To boost your performance in WBPSC AE exam, practice each question regularly and with focus. Every question tests your subject understanding, so solve them one at a time. Taking a quiz improves your speed and accuracy. Practicing topic-wise MCQs. Students benefit greatly from reviewing questions with answer keys, which help clarify concepts and strengthen Questions knowledge for success in WBPSC AE exams.

Latest WBPSC AE Exam Question (Objective Questions), MCQ in English

Subjects : Concerned Discipline (Mechanical)Concerned Discipline (Mechanical), Concerned Discipline (Mechanical)

Question Bank WBPSC Assistant Engineer Exam (Mechanical) - English

Concerned Discipline (Mechanical)

Q 1 :
Which of the following is the unit of kinematic viscosity _________________?
  1. A.Pascal
  2. B.Poise
  3. C.Stoke
  4. D.Faraday
  5. E.None of the above
Q 2 :
Consider the following processes:
1. Extension of a spring
2. Plastic deformation of a material
3. Magnetization of a material exhibiting hysteresis
Which of the above process are irreversible?
  1. A.1 and 2 only            
  2. B.1 and 3 only
  3. C.1 only                        
  4. D.1, 2 and 3
Q 3 :
Which of the following statements are correct for a throttling process?
1. It is an adiabatic steady flow process
2. The enthalpy before and after throttling is same
3. In the processes, due to fall in pressure, the fluid velocity at outlet is always more than inlet velocity
  1. A.1 and 2 only            
  2. B.1 and 3 only
  3. C.2 and 3 only                        
  4. D.1, 2 and 3
Q 4 :
A Reversed Carnot Engine removes 50 kW from a heat sink. The temperature of the heat sink is 250 K and the temperature of the heat reservoir is 300 K. The power required of the engine is
  1. A.10 kW      
  2. B.20 kW
  3. C.30 kW    
  4. D.50 kW
Q 5 :
A heat engine receives heat at the rate of 2500 kJ/min and gives an output of 12.4 kW. Its thermal efficiency is, nearly
  1. A.18%                        
  2. B.23%
  3. C.26%                        
  4. D.30%
Q 6 :
A spherical waterdrop of 1 mm in diameter splits up in air into 64 smaller drops of equal size. The surface tension coefficient of water in air is 0.073 N/m. The work required in splitting up the drop is
  1. A.0.96 × 10–6 J            
  2. B.0.69 × 10–6 J
  3. C.0.32 × 10–6 J            
  4. D.0.23 × 10–6 J
Q 7 :
Consider the following statements pertaining to stability of floating bodies:
1. A floating body will be stable when the centre of gravity is above the centre of buoyancy.
2. The position of metacentres corresponding to different axes of rotation are generally different for the same floating object.
3. For cargo ships, the metacentric height varies with loading.
Which of the above statements are correct?
  1. A.1, 2 and 3                
  2. B.1 and 2 only
  3. C.1 and 3 only                        
  4. D.2 and 3 only
Q 8 :
Water is coming out from a tap and falls vertically downwards. At the tap opening, the stream diameter is 20 mm with uniform velocity of 2 m/s. Assuming steady inviscid flow, constant pressure atmosphere everywhere, and neglecting curvature and surface tension effects, the diameter of the stream 0.5 m below the tap opening is nearly
  1. A.11.7 mm                  
  2. B.14.6 mm
  3. C.17.5 mm                  
  4. D.20.4 mm
Q 9 :
Consider the following statements:
1. At low Reynolds numbers of any flow, viscous forces dominate over inertial forces.
2. Transition from laminar to turbulent flow occurs over a range of Reynolds numbers depending on the surface presented to the flow.
Which of the above statements is/are correct?
  1. A.1 only                     
  2. B.2 only
  3. C.Both 1 and 2           
  4. D.Neither 1 nor 2
Q 10 :
In a steady laminar flow of a given discharge through a circular pipe of diameter D, the head loss is proportional to
  1. A.D–1                          
  2. B.D–2
  3. C.D–3                          
  4. D.D–4
Q 11 :
The centre-line velocity in a pipe flow is 2m/s. What is the average flow velocity in the pipe if the Reynolds number of the flow is 800?
  1. A.2 m/s                       
  2. B.1.5 m/s
  3. C.1 m/s                      
  4. D.0.5 m/s
Q 12 :
During a constant pressure expansion of a gas, 33.3% heat is converted into work while the temperature rises by 20 K. The specific heat of the gas at constant pressure as a proportion of work, W is
  1. A.8%                          
  2. B.10%
  3. C.12%                        
  4. D.15%
Q 13 :
A system of 100 kg mass undergoes a process in which its specific entropy increases from 0.3 kJ/kg K to 0.4 kJ/kg K. At the same time, the entropy of the surroundings decreases from 80 kJ/kg K to 75 kJ/kg K. The process is
  1. A.reversible and isothermal
  2. B.irreversible
  3. C.reversible only
  4. D.isothermal only
Q 14 :
A reversible heat engine rejects 80% of the heat supplied during a cycle of operation. If the engine is reversed and operates as a refrigerator, then its coefficient of performance shall be
  1. A.6                             
  2. B.5
  3. C.4                             
  4. D.3
Q 15 :
For the same efficiency of the Brayton cycle and the Carnot cycle working between temperature limits of Tmax and Tmin, the power contribution of the Brayton cycle will be
  1. A.zero            
  2. B.maximum
  3. C.minimum
  4. D.50% of the Carnot cycle
Q 16 :
A fin will be more effective when Bio number is
  1. A.Greater than 1
  2. B.Equal to 1
  3. C.Between 1 and 3
                   4        4
  4. D.Less than 1
Q 17 :
A tank of length, breadth and height in the ratio of 2:1:2 is full of water. The ratio of hydrostatic force at the bottom to that at any larger vertical surface is
  1. A.1
  2. B.2
  3. C.3
  4. D.4
Q 18 :
Which of the following fluids exhibit a certain shear stress at zero shear strain rate followed by a straight line relationship between shear stress and shear strain rate?
  1. A.Newtonian fluid 
  2. B.Ideal Bingham plastic fluids
  3. C.Pseudo-plastic fluids
  4. D.Dilatent fluids
Q 19 :
What is the specific gravity of a marble stone, which weighs 400N in air, and 200N in water? (g=10m/s2)
  1. A.8
  2. B.6
  3. C.4
  4. D.2
Q 20 :
What is the intensity of pressure in the following SI units, when specific gravity of mercury is 13.6 and the intensity of pressure is 400KPa ?
  1. A.0.3 bar or 4.077m of water or 0.29 mm of Hg
  2. B.4 bar or 5.077m of water or 0.399 mm of Hg
  3. C.0.3 bar or 5.077m of water or 0.599 mm of Hg
  4. D.4 bar or 4.077m of water or 0.299 mm of Hg
Q 21 :
Consider the following statements:
1.If a small upward displacement is given to a floating body, it results in the reduction of the buoyant force acting on the body
2.A slight horizontal displacement does not change either the magnitude or the location of the buoyant force 
Which of the above statements is/are correct? 
  1. A.Both 1 and 2
  2. B.1 only 
  3. C.2 only
  4. D.Neither 1 nor 2 
Q 22 :
State whether following flow field is physically possible? 
  1. A.Possible for steady, incompressible flow
  2. B.Possible for unsteady, incompressible flow
  3. C.Possible for steady, compressible flow 
  4. D.Not Possible 
Q 23 :
In a differential manometer, a head of 0.5 m of fluid A in limb 1 is found to balance a head of 0.3 m of fluid B in limb 2. The atmospheric pressure is 760 mm of mercury. The ratio of specific gravities of A to B is
  1. A.0.25
  2. B.0.26
  3. C.2
  4. D.4
Q 24 :
A Reversed Carnot Engine removes 50 kW from a heat sink. The temperature of the heat sink is 250 K and the temperature of the heat reservoir is 300 K. The power required of the engine is
  1. A.10 kW 
  2. B.20 kW
  3. C.30 kW
  4. D.50 kW
Q 25 :
On which of the following just in time manufacturing philosophy emphasizes ?
  1. A.man power
  2. B.profit
  3. C.inventory
  4. D.manufacturing
Q 26 :
In a stream line steady flow, two points A and B on a stream line are 1m apart and the flow velocity varies uniformly from 2m/s to 5m/s. What is the acceleration of fluid at B?
  1. A.3 m/s2
  2. B.6 m/s2
  3. C.9 m/s2
  4. D.15 m/s2
Q 27 :
The stream function is given by Ψ = 3xy, then the velocity at the point (2,3) is
  1. A.9
  2. B.-6
  3. C.117
  4. D.10.8
Q 28 :
The boundary layer thickness at a given distance from the leading edge of a flat plate is
  1. A.More for lighter fluid
  2. B.More for denser fluid
  3. C.Less for denser fluid
  4. D.Less for lighter fluid
Q 29 :
In a laminar flow through a circular pipe, the discharge varies
  1. A.Linearly with fluid density
  2. B.Inversely with pressure drop
  3. C.Directly as square of pipe radius
  4. D.Inversely with fluid velocity
Q 30 :
A fluid is flowing over a flat plate. At distance of 8 cm from the leading edge, the Reynolds number is found to be 25600. The thickness of the boundary layer at this point is
  1. A.1.5mm
  2. B.2.5mm
  3. C.4.0mm
  4. D.5.0mm
Q 31 :
Air is flowing over a flat plate with a free stream velocity of 24 m/s, and its kinematic viscosity is 72 ×10-6m2/s. If at a particular point, the Reynolds number is 30000, its location from the leading edge is
  1. A.0.05m 
  2. B.0.07m
  3. C.0.08m
  4. D.0.09m
Q 32 :
In a refrigerator, the evaporator and condenser coil temperatures are –33°C and 27°C, respectively. Assuming that the maximum COP is realized, the required power input for a refrigerating effect of 4 kW is
 
  1. A.8 kW     
  2. B.4 kW
  3. C.2 kW    
  4. D. 1 kW
Q 33 :
In a hydraulic coupling
  1. A.The magnitudes of input and output torques are equal
  2. B.The magnitudes of input torque is greater than output torque
  3. C.The magnitudes of input torque is less than output torque
  4. D.The magnitudes of input torque is negligible as compared to output torque 
Q 34 :
Consider the following statements:
1.The wheel can be operated freely in air
2.Pressure at the exit of the nozzle is atmospheric
3.Pressure does not vary along the moving vanes
4.Change the direction of momentum imparts thrust over moving vanes Which of the following statements are applied to impulse turbine?
  1. A.1,2 and 3 only
  2. B.1,2 and 4 only
  3. C.3 and 4 only
  4. D.1,2, 3 and 4 
Q 35 :
A water jet 0.0015m2in area issues from a nozzle with 15 m/s velocity. It is made to impinge perpendicular on to a plate that moves away from the jet with a velocity of 5 m/s. The force on the plate due to this impact is
  1. A.150 N
  2. B.1470 N
  3. C.340 N
  4. D.900 N
Q 36 :
If a submerged body displaced from its equilibrium position, returns to its original position, it is called __________.
  1. A.thermal equilibrium
  2. B.neutral equilibrium
  3. C.unstable equilibrium
  4. D.stable equilibrium
Q 37 :
In a flow measurement, a venturi meter is preferred over an orifice plate because _____.
  1. A.energy of head loss is less
  2. B.It is cheaper
  3. C.pressure drop is more
  4. D.space is limited  
Q 38 :
Pitot tube measures ______.
  1. A.dynamic pressure of a moving stream
  2. B.guage pressure
  3. C.temperature of moving water
  4. D.pressure difference between two fluids
Q 39 :
Which of the following is not a property of an ideal fluid ?
  1. A.flow is irrotational
  2. B.it has no viscosity
  3. C.it has viscosity
  4. D.it is incompressible
Q 40 :
Nozzle used in steam turbines convert ________.
  1. A.enthalpy of steam into work
  2. B.enthalpy of steam into kinetic energy
  3. C.enthalpy of steam into pressure energy
  4. D.pressure energy into work
Q 41 :
Which of the following assumptions is the most relevant in air-standard cycle analysis ?
  1. A.All the processes within the cycle are irreversible
  2. B.Working fluid is a fixed mass
  3. C.Specific heat of air changes during the cycle
  4. D.Cycle is assumed to be an open cycle
Q 42 :
The modern Francis turbine is a ___________flow turbine .
  1. A.tangential 
  2. B.axial
  3. C.radial
  4. D.mixed
Q 43 :
Variation of stress with strain rate for a Newtonian fluid is ______ .
  1. A.hyperbolic
  2. B.linear
  3. C.elliptical
  4. D.parabolic
Q 44 :
Which of the following is NOT a part of refrigeration systems ?
  1. A.Turbine
  2. B.Evaporator
  3. C.Compressor
  4. D.Condenser
Q 45 :
Which of the following is NOT an intensive property ?
  1. A.Temperature
  2. B.Total volume
  3. C.Pressure
  4. D.Density
Q 46 :
Which of the following does NOT represent a unit of viscosity ?
  1. A.Stoke
  2. B.Poise
  3. C.m²/sec
  4. D.N-m/sec
Q 47 :
__________ in the fuel is oxidised during knocking .
  1. A.Hydrocarbon
  2. B.Phosphorous
  3. C.Water
  4. D.Coal
Q 48 :
_________ is defined as the ability of a material to resist deformation under action of an external load .
  1. A.Stiffness
  2. B.Resilience
  3. C.Brittleness
  4. D.Toughness
Q 49 :
Draught is produced in locomotive boilers by which of the following components ?
  1. A.Locomotive
  2. B.Steam jet
  3. C.Centrifugal fan
  4. D.Chimney
Q 50 :
For a steady flow, the value of all fluid properties at any fixed point _________ .
  1. A.do not change with location
  2. B.change with time
  3. C.change with location
  4. D.do not change with time

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