Mechanical Engineering - IC Engines and Nuclear Power Plants

26. 

Ordinary water is sometimes used as moderator when enriched uranium is used as a fuel in nuclear power plants.

A. Yes
B. No

Answer: Option A

Explanation:

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27. 

The compensating jet in a carburettor supplies almost constant amount of petrol at all speeds because the

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

Answer: Option D

Explanation:

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28. 

The effective inhibitor of pre-ignition is

A. alcohol
B. water
C. lead
D. none of these

Answer: Option B

Explanation:

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29. 

The purpose of testing an internal combustion engine is

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

Answer: Option D

Explanation:

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30. 

The thermal efficiency of diesel engines is about

A. 15%
B. 30%
C. 50%
D. 70%

Answer: Option D

Explanation:

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