Discussion
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- Question
The purpose of testing an internal combustion engine is
Options- A. to determine the information, which can not be obtained by calculations
- B. to conform the data used in design, the validity of which may be doubtful
- C. to satisfy the customer regarding the performance of the engine
- D. all of the above
- Correct Answer
- all of the above
- 1. The critical pressure ratio for initially dry saturated steam is more as compared to initially wet steam.
Options- A. Yes
- B. No Discuss
- 2. A nozzle is said to be a convergent nozzle
Options- A. when the cross-section of the nozzle increases continuously from entrance to exit
- B. when the cross-section of the nozzle decreases continuously from entrance to exit
- C. when the cross-section of the nozzle first decreases from entrance to throat and then increases from its throat to exit
- D. none of the above Discuss
- 3. When the back pressure of a nozzle is below the designed value of pressure at exit of nozzle, the nozzle is said to be
Options- A. choked
- B. underdamping
- C. overdamping
- D. none of these Discuss
- 4. The rate of discharge through the nozzle __________ when the exit pressure is gradually reduced.
Options- A. remains same
- B. decreases
- C. increases Discuss
- 5. In a convergent divergent nozzle, the discharge depends upon the initial conditions of steam and the area of nozzle at throat.
Options- A. Correct
- B. Incorrect Discuss
- 6. The thermal efficiency of a standard Otto cycle for a compression ratio of 5.5 will be
Options- A. 25%
- B. 50%
- C. 70%
- D. 100% Discuss
- 7. Where reactor operation is designed with fast neutrons such as in reactors using highly enriched fuel, the moderator used is
Options- A. heavy water
- B. graphite
- C. carbon dioxide
- D. no moderator is needed Discuss
- 8. The compensating jet in a carburettor supplies almost constant amount of petrol at all speeds because the
Options- A. jet area is automatically varied depending on the suction
- B. the flow from the main jet is diverted to the compensating jet with increase in speed
- C. the diameter of the jet is constant and the discharge coefficient is invariant
- D. flow is produced due to the static head in the float chamber Discuss
- 9. Pre-ignition is caused by the spontantaneous combustion of the mixture before the end of the compression stroke, and is due to
Options- A. cylinder walls being too hot
- B. overheated spark plug points
- C. red hot carbon deposits on cylinder walls
- D. any one of these Discuss
- 10. In a four stroke cycle petrol engine, the inlet valve
Options- A. opens at top dead centre and closes at bottom dead centre
- B. opens at 20° before top dead centre and closes at 40° after bottom dead centre
- C. opens at 20° after top dead centre and closes at 20° before bottom dead centre id) may open or close anywhere Discuss
IC Engines and Nuclear Power Plants problems
Search Results
Correct Answer: No
Correct Answer: when the cross-section of the nozzle decreases continuously from entrance to exit
Correct Answer: underdamping
Correct Answer: increases
Correct Answer: Correct
Correct Answer: 50%
Correct Answer: no moderator is needed
Correct Answer: flow is produced due to the static head in the float chamber
Correct Answer: any one of these
Correct Answer: opens at 20° before top dead centre and closes at 40° after bottom dead centre
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