Discussion
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- Question
A long delay period in compression ignition engines gives a more rapid rise in pressure which causes knocking.
Options- A. Yes
- B. No
- Correct Answer
- Yes
- 1. Detonation is harmful due to
Options- A. increase in the rate of heat transfer, there is a reduction in the power output and efficiency of the engine
- B. excessive turbulence which removes most of the insulating gas boundary layer from the cylinder walls
- C. high intensity of knock causes crankshaft vibration and the engine runs rough
- D. none of the above Discuss
- 2. The knocking in diesel engines may be prevented by
Options- A. reducing the delay period
- B. raising the compression ratio
- C. increasing the inlet pressure of air
- D. all of these Discuss
- 3. The normal heptane (C7H16) is given a rating of __________ octane number.
Options- A. 0
- B. 50
- C. 100
- D. 120 Discuss
- 4. A fission chain reaction in uranium can be developed
Options- A. by increasing the contents of U235
- B. by slowing down fast neutrons so that U235 fission continues by slow neutron
- C. both (a) and (b)
- D. none of these Discuss
- 5. The thermal efficiency of petrol and gas engines is about
Options- A. 15%
- B. 30%
- C. 50%
- D. 70% Discuss
- 6. The volumetric efficiency ofa well designed engine may be
Options- A. 30 to 40%
- B. 40 to 60%
- C. 60 to 70%
- D. 75 to 90% Discuss
- 7. The brake power is the power available
Options- A. in the engine cylinder
- B. at the crank shaft
- C. at the crank pin
- D. none of these Discuss
- 8. Which of the following statement is correct regarding the features of a Breeder reactor?
Options- A. It produces more fuel than it consumes.
- B. It requires highly enriched fuel.
- C. It requires liquid sodium metal as moderator.
- D. all of the above Discuss
- 9. If the compression ratio in I.C. engine increases, then its thermal efficiency will
Options- A. decrease
- B. increase
- C. remain same Discuss
- 10. The ignition of the charge by some hot surface within the engine before the passage of spark is called
Options- A. pre-ignition
- B. detonation
- C. ignition delay
- D. auto-ignition Discuss
IC Engines and Nuclear Power Plants problems
Search Results
Correct Answer: none of the above
Correct Answer: all of these
Correct Answer: 0
Correct Answer: both (a) and (b)
Correct Answer: 30%
Correct Answer: 75 to 90%
Correct Answer: at the crank shaft
Correct Answer: all of the above
Correct Answer: increase
Correct Answer: pre-ignition
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