Mechanical Engineering Online Quiz Competition

 

1) The diesel engines are also known as __________ engines. 

Compression Ignition

Spark Ignition

Saab Direct Ignition

Electromagnetism

Answer: Compression Ignition

 

2) Which of the following is a scalar quantity? 

Force

Velocity

Speed

Acceleration

Answer: Speed

 

3) A cycle consisting of one constant pressure, one constant volume and two isentropic processes is known as _______________ 

Carnot cycle

Stirling cycle

Otto cycle

Diesel cycle

Answer: Diesel cycle

 

4) An adiabatic process is one in which ______________________ 

no heat enters or leaves the gas

the temperature of the gas changes

the change in internal energy is equal to the mechanical workdone

All the above

Answer: All the above

 

5) The ratio of total useful heat drop to the total isentropic heat drop, is called _____________ 

Stage efficiency

Internal efficiency

Rankine efficiency

None of these

Answer: Internal efficiency

 

6) The maximum temperature in a gas turbine is _____________ 

200°C

500°C

700°C

1000°C

Answer: 700°C

 

7) The toughness of a material __________ when it is heated. 

increases

decreases

does not change

remains same

Answer: decreases

 

8) Which of the following material has maximum ductility? 

Mild steel

Copper

Nickel

Aluminium

Answer: Mild steel

 

9) Reheating in a gas turbine 

increases the thermal efficiency

increases the compressor work

increases the turbine work

decreases the thermal efficiency

Answer: increases the thermal efficiency

 

10) Cast iron is a _____________ 

Ductile material

Malleable material

Brittle material

Tough material

Answer: Brittle material

 

11) In a Kaplan turbine runner, the number of blades are generally between ____________ 

2 to 4

4 to 8

8 to 16

16 to 24

Answer: 4 to 8

 

12) In a refrigerating machine, heat rejected is __________ heat absorbed. 

equal to

less than

greater than

remains same as

Answer: greater than

 

13) Which of the following is the lightest and most volatile liquid fuel? 

Kerosene

Gasoline

Fuel oil

None of the above

Answer: Gasoline

 

14) The point, through which the whole weight of the body acts, irrespective of its position, is known as _____________ 

moment of inertia

centre of gravity

centre of percussion

centre of mass

Answer: centre of gravity