IC Engines and Nuclear Power Plants problems
- 1. In open combustion chamber in diesel engines, the shape and layout of the piston crown, the inlet port and the valve produce the turbulent effect of fuel mixture.
Options- A. True
- B. False Discuss
Correct Answer: True
- 2. Nuclear reactors are used
Options- A. to produce heat for thermoelectric power
- B. to produce fissionable material
- C. to propel ships, submarines, aircrafts
- D. all of these Discuss
Correct Answer: all of these
- 3. The diesel engines are also known as __________ engines.
Options- A. compression ignition
- B. spark ignition Discuss
Correct Answer: compression ignition
- 4. The self ignition temperature of petrol is __________ as compared to diesel oil.
Options- A. same
- B. lower
- C. higher Discuss
Correct Answer: higher
- 5. The exhaust valve in a four stroke cycle petrol engine
Options- A. opens at 50° before bottom dead centre and closes at 15° after top dead centre
- B. opens at bottom dead centre and closes at top dead centre
- C. opens at 50° after bottom dead centre and closes at 15° before top dead centre
- D. may open and close anywhere Discuss
Correct Answer: opens at 50° before bottom dead centre and closes at 15° after top dead centre
- 6. The expansion of fuel in a four stroke cycle diesel engine
Options- A. starts at 15° before top dead centre and ends at 30° after top dead centre
- B. starts at top dead centre and ends at 30° after top dead centre
- C. starts at 15° after top dead centre and ends at 30° before bottom dead centre
- D. may start and end anywhere Discuss
Correct Answer: starts at 15° after top dead centre and ends at 30° before bottom dead centre
- 7. The effective inhibitor of pre-ignition is
Options- A. alcohol
- B. water
- C. lead
- D. none of these Discuss
Correct Answer: water
- 8. The pre-ignition occurs before the spark is produced whereas detonation develops after the introduction of spark.
Options- A. Agree
- B. Disagree Discuss
Correct Answer: Agree
- 9. A moderator, in nuclear power plants, is a medium introduced into the fuel mass in order to
Options- A. slow down the speed of fast moving neutrons
- B. control the reaction
- C. reduce the temperature
- D. extract heat from nuclear reaction Discuss
Correct Answer: slow down the speed of fast moving neutrons
- 10. In petrol engine, using a fixed octane rating fuel and fixed compression ratio, supercharging will __________ the knocking tendency.
Options- A. not effect
- B. decrease
- C. increase Discuss
Correct Answer: increase
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