Mechanical Engineering - IC Engines and Nuclear Power Plants

1. 

The cetane number of diesel oil, generally available, is

A. 20 to 25
B. 25 to 30
C. 30 to 40
D. 40 to 55

Answer: Option D

Explanation:

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2. 

The object of providing masked inlet valve in the air passage of compression ignition engines is to

A. enhance flow rate
B. control air flow
C. induce primary swirl
D. induce secondary turbulence

Answer: Option C

Explanation:

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3. 

During suction stroke of a four stroke petrol engine, the inlet valve opens and the charge is sucked into the cylinder as the piston moves upwards from the bottom dead centre.

A. True
B. False

Answer: Option B

Explanation:

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4. 

The power actually developed by the engine cylinder of an I.C. engine is known as

A. theoretical power
B. actual power
C. indicated power
D. none of these

Answer: Option C

Explanation:

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5. 

A nuclear reactor is said to be critical when the neutron population in the reactor core is

A. rapidly increasing leading to the point of explosion
B. decreasing from the specified value
C. reduced to zero
D. constant

Answer: Option D

Explanation:

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