IC Engines and Nuclear Power Plants problems
- 1. A mixture containing 65% of iso-octane and 35% of normal heptane will have
Options- A. cetane number 65
- B. octane number 65
- C. qetane number 35
- D. octane number 35 Discuss
Correct Answer: octane number 65
- 2. The increase of efficiency of a compression ignition engine, as the load decreases, is due to
Options- A. higher maximum temperature
- B. qualitative governing
- C. quantitative governing
- D. hit and miss governing Discuss
Correct Answer: qualitative governing
- 3. The knocking tendency in spark ignition engines can be decreased by adding dopes like tetra ethyle lead and ethylene dibromide.
Options- A. Agree
- B. Disagree Discuss
Correct Answer: Agree
- 4. The function of a distributor in a coil ignition system of I.C. engines is
Options- A. to distribute spark
- B. to distribute power
- C. to distribute current
- D. to time the spark Discuss
Correct Answer: to time the spark
- 5. Which of the following statement is correct regarding petrol engines?
Options- A. A fine fuel spray mixed with air is ignited by the heat of compression which is at a high pressure.
- B. The fuel supplied to the engine cylinder is mixed with necessary amount of air and the mixture in ignited with the help of a spark plug.
- C. The fuel is first evaporated after passing through a carburettor and is mixed with air before ignition.
- D. all of the above Discuss
Correct Answer: The fuel supplied to the engine cylinder is mixed with necessary amount of air and the mixture in ignited with the help of a spark plug.
- 6. The cetane (C16H34) which is a straight chain paraffin is assigned a cetane number of
Options- A. 0
- B. 50
- C. 100
- D. 120 Discuss
Correct Answer: 100
- 7. The control rods in the control system of nuclear reactors are used to
Options- A. absorb excess neutrons
- B. control fuel consumption
- C. control temperature
- D. all of these Discuss
Correct Answer: absorb excess neutrons
- 8. In compression ignition engines, swirl denotes a
Options- A. haphazard motion of the gases in the chamber
- B. rotary motion of the gases in the chamber
- C. radial motion of the gases in the chamber
- D. none of the above Discuss
Correct Answer: rotary motion of the gases in the chamber
- 9. Supercharging __________ the power developed by the engine.
Options- A. has no effect on
- B. increases
- C. decreases Discuss
Correct Answer: increases
- 10. Which of the following statement is wrong?
Options- A. In compression ignition engines, detonation occurs near the beginning of combustion.
- B. Since the fuel, in compression ignition engines, is injected at the end of compression stroke, therefore, there will be no pre-ignition.
- C. To eliminate knock in compression ignition engines, we want to achieve auto-ignition not early and desire a long delay period.
- D. In compression ignition engines, because of hetrogeneous mixture, the rate of pressure rise is comparatively lower. Discuss
Correct Answer: To eliminate knock in compression ignition engines, we want to achieve auto-ignition not early and desire a long delay period.
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