250+ TOP MCQs on Miscellaneous and Answers

Power Plant Engineering Multiple Choice Questions on “Miscellaneous”.

1. Greenhouse effect is not caused by?
a) CFC’s
b) Sulphur dioxide
c) Carbon dioxide
d) None of the mentioned
Answer: a
Clarification: CFC’s aren’t responsible for the greenhouse effect.

2. In a four stroke cycle petrol engine, the inlet valve ___________
a) opens at top dead centre and closes at bottom dead centre
b) opens at 20° before top dead centre and closes at 40° after bottom dead centre
c) opens at 20° after top dead centre and closes at 20° before bottom dead centre id may open or close anywhere
d) none of the mentioned
Answer: b
Clarification: In a four stroke cycle petrol engine, the inlet valve opens at 20° before top dead centre and closes at 40° after bottom dead centre.

3. Which of the following does not relate to a compression ignition engine?
a) Fuel injector
b) Fuel pump
c) Governor
d) Carburettor
Answer: d
Clarification: Carburettor isn’t used in a compression ignition engine, instead it is used in spark ignition engine.

4. The theoretically correct mixture of air and petrol is?
a) 20:1
b) 15:1
c) 40:1
d) 50:1
Answer: a
Clarification: The theoretically correct mixture of air & petrol is 20:1.

5. The injection pressure in a diesel engine is about ___________
a) 10 bar
b) 100 bar
c) 150 bar
d) 300 bar
Answer: b
Clarification: The injection pressure in a diesel engine is about 100 bar.

6. The pressure at the end of compression, in diesel engines, is approximately ___________
a) 10 bar
b) 15 bar
c) 20 bar
d) 35 bar
Answer: d
Clarification: The pressure at the end of compression, in diesel engines, is approximately 35 bar.

7. The function of a distributor in a coil ignition system of I.C. engines is ___________
a) to distribute spark
b) to distribute power
c) to time the spark
d) to distribute current
Answer: c
Clarification: Distributor in a coil ignition system of an IC Engine times the spark produced.

8. Brayton cycle corresponds to ___________
a) IC Engines
b) Gas Turbines
c) IC Engines & Gas Turbines
d) None of the above mentioned
Answer: b
Clarification: Gas Turbines are based on Brayton cycle.

9. Intercooling is done in ___________
a) CI Engines
b) SI Engines
c) Gas Turbines
d) None of the mentioned
Answer: c
Clarification: Intercooling is done in Gas Turbines.

10. A Gas Turbine is also known as?
a) Compression Turbine
b) Compensation Turbine
c) Combustion Turbine
d) None of the mentioned
Answer: c
Clarification: Combustion Turbine is yet another name of Gas Turbines.