IC Engines and Nuclear Power Plants problems
- 1. In a coil ignition system of petrol engines, a condenser is connected across the contact-breaker in order to
Options- A. prevent sparking across the gap between the points
- B. cause more rapid break of the primary current, giving a higher voltage in the secondary circuit
- C. both (a) and (b)
- D. none of the above Discuss
Correct Answer: both (a) and (b)
- 2. An ignition coil in the spark ignition engines supplies __________ voltage to the spark plug.
Options- A. high
- B. low Discuss
Correct Answer: high
- 3. In a four stroke engine, the working cycle is completed in
Options- A. one revolution of the crankshaft
- B. two revolutions of the crankshaft
- C. three revolutions of the crankshaft
- D. four revolutions of the crankshaft Discuss
Correct Answer: two revolutions of the crankshaft
- 4. As compared to air standard cycle, in actual working, the effect of variation in specific heats is to
Options- A. increase maximum pressure and maximum temperature
- B. reduce maximum pressure and maximum temperature
- C. increase maximum pressure and decrease maximum temperature
- D. decrease maximum pressure and increase maximum temperature Discuss
Correct Answer: reduce maximum pressure and maximum temperature
- 5. The __________ engines can work on very lean mixture of fuel.
Options- A. spark ignition
- B. compression ignition Discuss
Correct Answer: compression ignition
- 6. The fuel valve in a four stroke cycle diesel engine
Options- A. opens at 15° after top dead centre and closes at 20° before bottom dead centre
- B. opens at 15° before top dead centre and closes at 20° after top dead centre
- C. opens at top dead centre and closes at bottom dead centre
- D. may open and close anywhere Discuss
Correct Answer: opens at 15° before top dead centre and closes at 20° after top dead centre
- 7. Diesel as compared to petrol is
Options- A. highly ignitable
- B. more difficult to ignite
- C. less difficult to ignite
- D. none of these Discuss
Correct Answer: more difficult to ignite
- 8. Enriched uranium may contain fissionable contents from
Options- A. 1 to 40%
- B. 10 to 50%
- C. 1 to 80%
- D. 1 to 99% Discuss
Correct Answer: 1 to 99%
- 9. In petrol engines, using a fixed octane rating fuel, the increase in compression ratio will not effect the knocking tendency.
Options- A. Agree
- B. Disagree Discuss
Correct Answer: Disagree
- 10. The ignition quality of diesel oil is expressed by
Options- A. cetane number
- B. octane number
- C. calorific value
- D. none of these Discuss
Correct Answer: cetane number
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