IC Engines and Nuclear Power Plants problems
- 1. The combustion in compression ignition engines is
Options- A. homogeneous
- B. hetrogeneous
- C. both (a) and (b)
- D. none of these Discuss
Correct Answer: hetrogeneous
- 2. In a petrol engine, the charge is ignited with the help of a spark plug.
Options- A. Yes
- B. No Discuss
Correct Answer: Yes
- 3. In order to prevent knocking in spark ignition engines, the charge away from the spark plug should have
Options- A. low density
- B. low temperature
- C. long ignition delay
- D. all of these Discuss
Correct Answer: all of these
- 4. Spark plugs in automobiles generally have a gap between
Options- A. 0.3 to 0.7 mm
- B. 0.2 to 0.8 mm
- C. 0.4 to 0.9 mm
- D. 0.6 to 1.8 mm Discuss
Correct Answer: 0.6 to 1.8 mm
Explanation:
Spark plugs in automobiles generally have a gap between 0.6 and 1.8 mm (0.024 and 0.071 in). The gap may require adjustment from the out-of-the-box gap.
- 5. A reactor capable of converting a fertile material into fissile isotopes is called regenerative reactor.
Options- A. Yes
- B. No Discuss
Correct Answer: Yes
- 6. Which of the following statement is wrong?
Options- A. A four stroke cycle engine develops twice the power as that of a two stroke cycle engine.
- B. For the same power developed, a four stroke cycle engine is lighter, less bulky and occupies less floor area.
- C. The petrol engines are costly than diesel engines.
- D. all of the above Discuss
Correct Answer: all of the above
- 7. The reflectivity of a reflector is defined as the fraction of neutrons entering the reflector which are returned to the core.
Options- A. Agree
- B. Disagree Discuss
Correct Answer: Agree
- 8. Which of the following fuel detonates readily?
Options- A. Benzene
- B. Iso-octane
- C. Normal heptane
- D. Alcohol Discuss
Correct Answer: Normal heptane
- 9. The knocking tendency in spark ignition engines may be decreased by
Options- A. controlling the air-fuel mixture
- B. controlling the ignition timing
- C. controlling the exhaust temperature
- D. reducing the compression ratio Discuss
Correct Answer: reducing the compression ratio
- 10. Number of working strokes per min. for a two stroke cycle engine are __________ the speed of the engine in r.p.m.
Options- A. equal to
- B. one-half
- C. twice
- D. four-times Discuss
Correct Answer: equal to
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