29 MCQs on Mechanical Engineering

Q1. What is the difference between stress and strain?

Both are the same.

None of the above.

Strain is the amount of force applied per unit area.

Stress is the amount of deformation that occurs as a result of the applied force.

Q2. Which type of pump is commonly used in high-pressure applications?

Positive displacement pump

Mixed flow pump

Axial flow pump

Centrifugal pump

Q3. Which type of material has the highest Young's modulus?

Copper

Titanium

Aluminum

Steel

Q4. Which type of fluid flow is characterized by constant velocity and pressure?

Turbulent flow

None of the above

Transitional flow

Laminar flow

Q5. Which type of bearing uses rolling elements?

Magnetic bearing

Rolling element bearing

Fluid bearing

Plain bearing

Q6. What is the function of a flywheel?

To store energy and smooth out fluctuations in speed

None of the above

To reduce friction between moving parts

To increase the power output of an engine

Q7. Which type of cooling system uses air to dissipate heat from an engine?

Liquid cooling system

Air cooling system

None of the above

Hybrid cooling system

Q8. What is the difference between a screw and a bolt?

Both are the same.

A bolt is threaded all the way to the head, while a screw has a smooth shank.

None of the above.

A screw is threaded all the way to the head, while a bolt has a smooth shank.

Q9. What is the difference between ductile and brittle materials?

Ductile materials can be bent and stretched without breaking, while brittle materials break easily when subjected to stress.

None of the above.

Both are the same.

Brittle materials can be bent and stretched without breaking, while ductile materials break easily when subjected to stress.

Q10. Which type of turbine is used in a gas turbine engine?

Both

None of the above

Reaction turbine

Impulse turbine

Q11. Which type of welding uses a consumable electrode?

TIG welding

Laser welding

Stick welding

MIG welding

Q12. What is the difference between a valve and a damper?

Both are the same.

None of the above.

A damper regulates the flow of fluid, while a valve regulates the flow of air.

A valve regulates the flow of fluid, while a damper regulates the flow of air.

Q13. Which type of compressor is commonly used in refrigeration systems?

Centrifugal compressor

Scroll compressor

Screw compressor

Reciprocating compressor

Q14. Which type of heat exchanger has the highest heat transfer coefficient?

Double-pipe heat exchanger

Shell and tube

Plate heat exchanger

Finned tube heat exchanger

Q15. What is the difference between a shaft and an axle?

A shaft transmits power from one component to another, while an axle supports and rotates a wheel or other rotating component.

None of the above.

An axle transmits power from one component to another, while a shaft supports and rotates a wheel or other rotating component.

Both are the same.

Q16. Which type of bearing is commonly used in high-speed applications?

Plain bearing

Magnetic bearing

Rolling element bearing

Fluid bearing

Q17. Which type of fluid flow is characterized by chaotic movement and irregular eddies?

Turbulent flow

Laminar flow

None of the above

Transitional flow

Q18. Which type of gear is used to transmit power between two non-parallel shafts?

Helical gear

Worm gear

Spur gear

Bevel gear

Q19. Which law states that the pressure of a gas is directly proportional to its temperature?

Gay-Lussac’s law

Charles’s law

Avogadro’s law

Boyle’s law

Q20. What is the difference between a motor and an engine?

Both are the same.

A motor converts electrical energy into mechanical energy, while an engine converts fuel into mechanical energy.

None of the above.

An engine converts electrical energy into mechanical energy, while a motor converts fuel into mechanical energy.

Q21. Which type of machining operation produces a smooth surface finish?

Grinding

Boring

Turning

Milling

Q22. What is the difference between torque and power?

Power is the force that causes rotation, while torque is the rate at which work is done.

None of the above.

Torque is the force that causes rotation, while power is the rate at which work is done.

Both are the same.

Q23. What is the difference between a gasket and a seal?

None of the above.

A seal prevents fluid leakage between two stationary surfaces, while a gasket prevents fluid leakage between two moving surfaces.

Both are the same.

A gasket prevents fluid leakage between two stationary surfaces, while a seal prevents fluid leakage between two moving surfaces.

Q24. Which type of gear is used to change the direction of rotation?

Bevel gear

Helical gear

Spur gear

Worm gear

Q25. Which type of compressor is more efficient at higher pressure ratios?

Centrifugal compressor

Axial compressor

Screw compressor

Reciprocating compressor

Q26. What is the difference between an open loop and a closed loop control system?

None of the above.

Both are the same.

A closed loop control system does not have a feedback loop, while an open loop control system uses a feedback loop to adjust the output.

An open loop control system does not have a feedback loop, while a closed loop control system uses a feedback loop to adjust the output.

Q27. What is the function of a gearbox?

None of the above

To convert electrical energy to mechanical energy

To store energy for later use

To transmit power between the engine and the wheels

Q28. Which type of bearing is commonly used in low-speed and heavy-load applications?

Plain bearing

Rolling element bearing

Fluid bearing

Magnetic bearing

Q29. Which type of material has the highest tensile strength?

Copper

Aluminum

Titanium

Steel

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