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Question Bank

Question for WBMSC Assistant Engineer Mechanical - Quiz / Questions / MCQ in English

Last Update on : October 10, 2026

Duration: 90 · Questions: 100 · Max Marks: 200

View WBMSC Assistant Engineer (Mechanical) 2026 Exam Page

To boost your performance in WBMSC Assistant Engineer Mechanical 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 WBMSC Assistant Engineer Mechanical exams.

Latest WBMSC Assistant Engineer Mechanical Exam Question (Objective Questions), MCQ in English

Subjects : Mechanical

Question Bank WBMSC Assistant Engineer (Mechanical) Exam - English

Mechanical

Q 1 :
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 2 :
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 3 :
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 4 :
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 5 :
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 6 :
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 7 :
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 8 :
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 9 :
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 10 :
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 11 :
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 12 :
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 13 :
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 14 :
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 15 :
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 16 :
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 17 :
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 18 :
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 19 :
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 20 :
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 21 :
Consider the following statements with regard to hydraulic turbines:
1.Kaplan turbines are most efficient at part load operations.
2.If n is the number of jets in a Pelton turbine, then the specific speed is proportional to n2.
3.The flow ratio of Francis turbines are in the range of 0.1 – 0.3. 
Which of the above statements is/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 22 :
Which of the following is a Vector quantity ?
  1. A.Energy 
  2. B.Mass
  3. C.Momentum
  4. D.Angle
Q 23 :
Bernoulli’s equation is applicable between any two points located in
  1. A.Rotational flow of an incompressible fluid
  2. B.Irrotational flow of compressible or incompressible fluid
  3. C.Steady, rotational flow of an incompressible fluid
  4. D.Steady, irrotational flow of an incompressible fluid 
Q 24 :
Water flows through a smooth circular pipe of diameter D and length L because of a pressure difference ΔP across the length. The volume flow rate is Q and the flow is turbulent with Reynolds number 105. If the pressure difference is increased to 4ΔP the volume flow rate will be
  1. A.2Q
  2. B.A little more than 2Q
  3. C.A little less than 2Q
  4. D.4Q
Q 25 :
 Heat is lost from a 100 mm diameter steam pipe placed horizontally in ambient air at 30°C. If the Nusselt number is 25 and the thermal conductivity of the air is 0.03 W/m K, then the heat transfer coefficient will be
  1. A. 7.5 W/m2K      
  2. B.15 W/m2K
  3. C.25 W/m2K      
  4. D. 35 W/m2K
Q 26 :
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 27 :
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 28 :
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 29 :
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 30 :
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 31 :
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 32 :
The modern Francis turbine is a ___________flow turbine .
  1. A.tangential 
  2. B.axial
  3. C.radial
  4. D.mixed
Q 33 :
Variation of stress with strain rate for a Newtonian fluid is ______ .
  1. A.hyperbolic
  2. B.linear
  3. C.elliptical
  4. D.parabolic
Q 34 :
Which of the following is NOT a part of refrigeration systems ?
  1. A.Turbine
  2. B.Evaporator
  3. C.Compressor
  4. D.Condenser
Q 35 :
Which of the following is NOT an intensive property ?
  1. A.Temperature
  2. B.Total volume
  3. C.Pressure
  4. D.Density
Q 36 :
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 37 :
__________ in the fuel is oxidised during knocking .
  1. A.Hydrocarbon
  2. B.Phosphorous
  3. C.Water
  4. D.Coal
Q 38 :
_________ 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 39 :
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 40 :
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
Q 41 :
For a floating body, if the metacentre is below the centre of gravity, then the body is said to be __________ equilibrium .
  1. A.thermal 
  2. B.stable 
  3. C.unstable
  4. D.neutral
Q 42 :
________ is useful for measuring flow of a conducting fluid .
  1. A.Orifice meter
  2. B.Rotameter
  3. C.Vane meter
  4. D.Electro-magnetic flow meter
Q 43 :
A two- stroke engine consists of ________ port (s)
  1. A.Three
  2. B.Four
  3. C.One
  4. D.Two
Q 44 :
Air Cooling is mostly preferred for _________ .
  1. A.heavy truck
  2. B.buses
  3. C.moto cycles
  4. D.multi-utility vehicles
Q 45 :
_______ valves are provided in reciprocating compressors .
  1. A.Simply supported
  2. B.Solenoid
  3. C.Plate
  4. D.Poppet
Q 46 :
Benson boiler have ______ water drum (s)
  1. A.One
  2. B.Zero
  3. C.Three
  4. D.Two
Q 47 :
_________ is used for pumping water into a boilers .
  1. A.Economiser
  2. B.Duplex pump
  3. C.Feed pump
  4. D.Rotor
Q 48 :
The function of a carburetor in internal combustion engines is :
  1. A.to control fuel alone
  2. B.to cool exhaust gases
  3. C.to maintain air-fuel ratio
  4. D.to control air alone
Q 49 :
The device which transfers energy from the ______ to _____ the is known as hydraulic turbine .
  1. A.atmosphere; fluid  
  2. B.  rotor; fluid
  3. C.fluid; rotor
  4. D.fluid; atmosphere
Q 50 :
The flash chamber in the single stage VCR cycle serves to ________ .
  1. A.decrease the compression ratio
  2. B.increase the refrigerating effect
  3. C.increase the compression ratio
  4. D.decrease the refrigerating effect

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