Explore topic-wise MCQs in Mechanical Engineering Questions.

This section includes 266 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering Questions knowledge and support exam preparation. Choose a topic below to get started.

1.

Which of the following is a type of cushioning in hydraulic cylinders?
A. trunnion cushioning
B. adjustable cushioning
C. clevis cushioning
D. none of the above
Answer» C. clevis cushioning
Discussion
2.

Which numbers are used to denote retraction of a piston rod?
A. even numbers
B. odd numbers
C. both even and odd numbers
D. none of the above
Answer» C. both even and odd numbers
Discussion
3.

Which of the following is used to sense the initial and final positions of a piston rod?
A. lever operated direction control valve
B. limit switch
C. roller lever valve
D. all of the above
Answer» E.
Discussion
4.

Which valve gets activated only in one direction that is forward or backward movement of the piston rod?
A. roller lever valve
B. idle roller lever valve
C. both a. and b.
D. none of the above
Answer» C. both a. and b.
Discussion
5.

Which of the following is an element of time delay valve?
A. flow control valve
B. direction control valve
C. both a. and b.
D. none of the above
Answer» D. none of the above
Discussion
6.

How is proximity switch differentiated from limit switch?
A. proximity switch is activated when moving parts have physical contact with it
B. proximity switch is activated when non-moving parts have physical contact
C. proximity switch is activated when moving parts are close to it
D. none of the above
Answer» D. none of the above
Discussion
7.

In which circuits, relay of low voltage and low current is used to make open or close contact?
A. high voltage and high current circuit
B. low voltage and low current circuit
C. high voltage and low current circuit
D. low voltage and low current circuit
Answer» B. low voltage and low current circuit
Discussion
8.

In electropneumatic circuits,
A. spool is shifted by signal air
B. spool is shifted by control air
C. spool is shifted by electromotive force
D. all of the above
Answer» D. all of the above
Discussion
9.

Why are electromechanical relays more popular than solid state relays?
A. they are reliable
B. less costly
C. both a. and b.
D. none of the above
Answer» D. none of the above
Discussion
10.

For starting an axial flow pump, its delivery valve should be____________________?
A. closed
B. open
C. depends on starting condition and flow desired
D. could be either open or closed
E. partly open and partly closed
Answer» C. depends on starting condition and flow desired
Discussion
11.

Cam lobe hydraulic motor is a type of
A. axial hydraulic motor
B. orbit hydraulic motor
C. gear hydraulic motor
D. radial hydraulic motor
Answer» E.
Discussion
12.

Cartridge kits generate pumping chambers of various sizes, which
A. increase the flow rate
B. decrease the flow rate
C. increase and decrease the flow rate
D. none of the above
Answer» D. none of the above
Discussion
13.

According to fan laws, at constant speed and capacity, the pressure and power vary_____________________?
A. directly as the air or gas density
B. inversely as square root of density
C. inversely as density
D. as square of density
E. as square root of density
Answer» B. inversely as square root of density
Discussion
14.

In a centrifugal pump casing, the flow of water leaving the_______________?
A. radial
B. radial
C. centrifugal
D. rectilinear
E. vortex
Answer» F.
Discussion
15.

During any operation in hydraulic system, oil prefers the path of
A. least resistance
B. maximum resistance
C. both a. and b.
D. none of the above
Answer» B. maximum resistance
Discussion
16.

Why is fluid power preferred in mobile vehicles? 1. Power can be transmitted without any delay 2. When overloaded, fluid power systems stop without damaging the components 3. Speed variation cannot be achieved 4. Fluid is non-compressible
A. 1 and 4
B. 2, 3 and 4
C. 1, 2 and 4
D. 1 and 2
Answer» D. 1 and 2
Discussion
17.

Which of the following statements is true for a proportional valve?
A. spool of the proportional valve can travel maximum length
B. digital type of functioning is possible in proportional valve
C. proportional valve requires a separate flow control valve
D. all of the above
Answer» B. digital type of functioning is possible in proportional valve
Discussion
18.

What is a pressure sequence valve?
A. it is a combination of adjustable pressure relief valve and directional control valve
B. it is a combination of nonadjustable pressure relief valve and directional control valve
C. it is a combination of adjustable pressure reducing valve and check valve
D. it is a combination of adjustable pressure reducing valve and flow control valve
Answer» B. it is a combination of nonadjustable pressure relief valve and directional control valve
Discussion
19.

Which of the following logic valve is known as shuttle valve?
A. OR gate
B. AND gate
C. NOR gate
D. NAND
Answer» B. AND gate
Discussion
20.

Which fluid is used in hydraulic power systems?
A. water
B. oil
C. non-compressible fluid
D. all of the above
Answer» E.
Discussion
21.

What is difference between regulator and pressure switch?
A. regulator operates at set value pressure while pressure switch operates with slight fluctuation in pressure
B. pressure switch operates at set value pressure while regulator operates with slight fluctuation in pressure
C. both a. and b.
D. None of the above
Answer» B. pressure switch operates at set value pressure while regulator operates with slight fluctuation in pressure
Discussion
22.

What effect does overloading have on fluid power and electrical systems?
A. electrical components get damaged in electrical systems
B. fluid power system stops working without damaging the components
C. both a. and b.
D. none of the above
Answer» D. none of the above
Discussion
23.

In pneumatic systems, AND gate is also known as
A. check valve
B. shuttle valve
C. dual pressure valve
D. none of the above
Answer» D. none of the above
Discussion
24.

Generally liquids are non-compressible but when a large pressure of 70 bar is applied, petroleum oil can be compressed up to
A. 0.5% of its original volume
B. 1% of its original volume
C. 5% of its original volume
D. none of the above
Answer» B. 1% of its original volume
Discussion
25.

How is power transmitted in fluid power systems?
A. power is transmitted instantaneously
B. power is transmitted gradually
C. both a. and b.
D. none of the above
Answer» B. power is transmitted gradually
Discussion
26.

Can all hydraulic fluids be compressed when extremely large pressure is applied?
A. Yes
B. No
Answer» B. No
Discussion
27.

Which of the following is a component used in air generation system?
A. pressure switch
B. pressure gauge
C. drier
D. intercooler
Answer» D. intercooler
Discussion
28.

Which of the following statements are true? 1. Bell housing connects motor and pump 2. Centrifugal pump is a non-positive displacement pump 3. Centrifugal pumps allow the back flow of fluid from delivery side to the suction side of the pump 4. The function of vent plug used in a reservoir is to flush out oil

A. 1, 2 and 4
B. 2, 3 and 4
C. 2 and 3
D. all of the above
Answer» C. 2 and 3
Discussion
29.

What is the advantage of DC solenoid coils?
A. DC solenoid coils have high rush in current
B. DC solenoid coils have constant level of current
C. DC solenoid coils have rating of 220 V DC
D. all of the above
Answer» C. DC solenoid coils have rating of 220 V DC
Discussion
30.

In which systems, spool of the servo valve is operated by a torque motor?
A. hydromechanical servo systems
B. electrohydraulic servo systems
C. conventional servo valve
D. all of the above
Answer» C. conventional servo valve
Discussion
31.

Which of the following statements is true for cascade method which is used to draw a pneumatic circuit?
A. signal processing valves are connected in parallel
B. when the number of signal processing valves are greater than 4, the signals are strong
C. cascade method does not consider the cost factor
D. all of the above
Answer» D. all of the above
Discussion
32.

Overlapping of signals in pneumatic systems can be avoided by using
A. rolling lever valve
B. idle roller lever valve
C. both a. and b.
D. none of the above
Answer» D. none of the above
Discussion
33.

What does servo mean in servo valve system?
A. it cannot receive a feedback but the desired output can be obtained
B. it cannot receive a feedback and the desired output cannot be obtained
C. it can receive a feedback and the desired output can be obtained
D. none of the above
Answer» D. none of the above
Discussion
34.

In conventional valves, which component is used to move the spool?
A. torque motor
B. mechanical servo valve
C. solenoid
D. all of the above
Answer» D. all of the above
Discussion
35.

Which valve is used to block the accumulator from the system for the purpose of safety?
A. pilot valve
B. needle valve
C. detent valve
D. all of the above
Answer» C. detent valve
Discussion
36.

What is a positive displacement pump?
A. oil from suction side of the pump flows completely to the delivery side
B. volume of fluid discharged cannot return back to the suction side of the pump
C. discharges fixed volume of fluid every cycle
D. all of the above
Answer» E.
Discussion
37.

Which of the following is used as a component in hydraulic power unit?
A. pressure gauge
B. filler gauge
C. valve
D. reservoir
Answer» D. reservoir
Discussion
38.

Which of the following systems generate more energy when used in industrial applications?
A. hydraulic systems
B. pneumatic systems
C. both systems generate same energy
D. cannot say
Answer» B. pneumatic systems
Discussion
39.

Leakage in rotary chucks can be compensated by
A. flow control valve
B. pilot operated check valve
C. accumulator
D. all of the above
Answer» D. all of the above
Discussion
40.

What is the advantage of using a single acting cylinder?
A. high cost and reliable
B. honing inside the inner surface of pump is not required
C. piston seals are not required
D. all of the above
Answer» D. all of the above
Discussion
41.

What does the numbers in 4/2 valve mean?
A. 4 positions and 2 ways
B. 4 ways and 2 positions
C. both a. and b.
D. none of the above
Answer» C. both a. and b.
Discussion
42.

Which of the following factors is/are considered while selecting a compressor?
A. type of oil filter required
B. volumetric efficiency
C. viscosity of the liquids used
D. all of the above
Answer» C. viscosity of the liquids used
Discussion
43.

Which type of compressor requires a reservoir for compressed air and why?
A. rotary compressor to avoid pulsating effect
B. reciprocating compressor to avoid pulsating effect
C. both rotary and reciprocating compressors to avoid pulsating effect
D. none of the above
Answer» C. both rotary and reciprocating compressors to avoid pulsating effect
Discussion
44.

Accessories used in a hydraulic power unit adjust pressure and are used to generate flow and direction of the fluid.
A. True
B. False
Answer» C.
Discussion
45.

Rotary motion in a hydraulic power unit is achieved by using
A. hydraulic cylinder
B. pneumatic cylinder
C. both hydraulic and pneumatic cylinder
D. none of the above
Answer» E.
Discussion
46.

Leakage in welded type of hydraulic cylinder is prevented by
A. wiper in gland cover
B. rod seal in end cover
C. rod seal in gland cover
D. none of the above
Answer» D. none of the above
Discussion
47.

Which energy is converted into mechanical energy by the hydraulic cylinders?
A. hydrostatic energy
B. hydrodynamic energy
C. electrical energy
D. none of the above
Answer» B. hydrodynamic energy
Discussion
48.

What is the function of electric actuator?
A. converts electrical energy into mechanical torque
B. converts mechanical torque into electrical energy
C. converts mechanical energy into mechanical torque
D. none of the above
Answer» B. converts mechanical torque into electrical energy
Discussion
49.

What is the relation between speed and flow rate for fixed displacement vane pump?
A. flow rate increases with increase in speed of rotor
B. flow rate decreases with increase in speed of rotor
C. flow rate is constant and does not change with change in speed
D. none of the above
Answer» B. flow rate decreases with increase in speed of rotor
Discussion
50.

Which type of motion is transmitted by hydraulic actuators?
A. linear motion
B. rotary motion
C. both a. and b.
D. none of the above
Answer» D. none of the above
Discussion