Solar Power Future: How Renewable Energy Will Transform the World

 

Mechanical technical interview questions and answers for All
PART-5

Quiz Presentation 

01 to 20

1.Q: The rate of heat transfer through a material depends on:

a) Temperature difference only

b) Thermal conductivity only

c) Both temperature difference and thermal conductivity

d) Neither temperature difference nor thermal conductivity

Answer: c) Both temperature difference and thermal conductivity

 

2.Q: Which of the following is a scalar quantity?

a) Force

b) Velocity

c) Displacement

d) Torque

Answer: c) Displacement

 

3.Q: The maximum stress theory used for the design of machine elements is also known as:

a) Tresca theory

b) Von Mises theory

c) Maximum distortion energy theory

d) Rankine theory

Answer: a) Tresca theory

 

3.Q: The efficiency of a Carnot cycle operating between two temperature limits depends on:

a) The nature of the working fluid

b) The pressure ratio

c) The temperature ratio

d) The volume ratio

Answer: c) The temperature ratio

 

 

4.Q: In a cam-follower mechanism, the type of follower that maintains contact with the cam profile by means of a roller is called:

a) Knife-edge follower

b) Flat-faced follower

c) Roller follower

d) Spherical follower

Answer: c) Roller follower

 

5.Q: In metal casting, the term "riser" refers to:

a) A cavity in the mold used for pouring molten metal

b) A device used to regulate the flow of molten metal into the mold

c) A device used to remove excess material from the casting

d) A reservoir of molten metal used to compensate for shrinkage during solidification

Answer: d) A reservoir of molten metal used to compensate for shrinkage during solidification

 

6.Q: Which of the following materials exhibits superconductivity at low temperatures?

a) Copper

b) Aluminum

c) Lead

d) Steel

Answer: c) Lead

 

7.Q: The specific speed of a centrifugal pump depends on:

a) The flow rate

b) The head developed by the pump

c) The rotational speed of the pump

d) The viscosity of the fluid

Answer: c) The rotational speed of the pump

 

8.Q: The technique used to determine the most efficient sequence of operations in a production process is called:

a) Time study

b) Work sampling

c) Line balancing

d) Critical path method

Answer: c) Line balancing

 

9.Q: The Brayton cycle is commonly used in the operation of:

a) Steam turbines

b) Gas turbines

c) Reciprocating compressors

d) Centrifugal compressors

Answer: b) Gas turbines

 

10.Q: The property of a fluid that describes its resistance to shear stress is called:

a) Viscosity

b) Surface tension

c) Compressibility

d) Specific gravity

Answer: a) Viscosity

 

11.Q: The knocking in an internal combustion engine is caused by:

a) Premature ignition of the fuel-air mixture

b) Insufficient fuel supply

c) Excessive lubrication

d) Improper valve timing

Answer: a) Premature ignition of the fuel-air mixture

 

12.Q: The specific speed of a turbine is defined as the speed at which a turbine of unit head and unit discharge produces:

a) Maximum power output

b) Maximum efficiency

c) Maximum pressure rise

d) Maximum torque

Answer: b) Maximum efficiency

 

13.Q: Hooke's Law states that the stress in a material is directly proportional to:

a) The strain in the material

b) The modulus of elasticity of the material

c) The area of cross-section of the material

d) The length of the material

Answer: b) The modulus of elasticity of the material

 

14.Q: The function of a control rod in a nuclear reactor is to:

a) Absorb excess neutrons

b) Generate electricity

c) Cool down the reactor

d) Provide structural support

Answer: a) Absorb excess neutrons

 

15.Q: The refrigerant used in most domestic refrigerators and air conditioners is:

a) R-12 (dichlorodifluoromethane)

b) R-22 (chlorodifluoromethane)

c) R-134a (tetrafluoroethane)

d) R-410A (hydrofluorocarbon blend)

Answer: d) R-410A (hydrofluorocarbon blend)

 

16.Q: The efficiency of a thermal power plant is defined as the ratio of:

a) Heat supplied to the working fluid to the electrical power output

b) Electrical power output to the heat supplied to the working fluid

c) Heat rejected to the ambient to the electrical power output

d) Electrical power output to the heat rejected to the ambient

Answer: b) Electrical power output to the heat supplied to the working fluid

17.Q: The efficiency of a thermal power plant is defined as the ratio of:

a) Heat supplied to the working fluid to the electrical power output

b) Electrical power output to the heat supplied to the working fluid

c) Heat rejected to the ambient to the electrical power output

d) Electrical power output to the heat rejected to the ambient

Answer: b) Electrical power output to the heat supplied to the working fluid

 

18.Q: In a feedback control system, the controller adjusts the system output based on the difference between the actual output and the desired or reference value. This type of control is known as:

a) Open-loop control

b) Closed-loop control

c) Proportional control

d) On-off control

Answer: b) Closed-loop control

 

19.Q: The process of joining two metal parts by melting and adding a filler material into the joint is called:

a) Welding

b) Brazing

c) Soldering

d) Riveting

Answer: a) Welding

 

20.Q: Which of the following energy sources is considered to be a renewable resource?

a) Natural gas

b) Coal

c) Crude oil

d) Solar power

Answer: d) Solar power