IC Engines and Nuclear Power Plants - Section 1 (6)

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IC Engines and Nuclear Power Plants - Section 1

41.

The predominent isotope of the naturally occuring element is

A.	U235
B.	U238
C.	Pu233
D.	Pu239

Answer: Option B

Explanation:

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42.

A moderator generally used in nuclear power plants is

A.	graphite
B.	heavy water
C.	concrete
D.	graphite and concrete

Answer: Option D

Explanation:

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43.

Nuclear reactors are used

A.	to produce heat for thermoelectric power
B.	to produce fissionable material
C.	to propel ships, submarines, aircrafts
D.	all of these

Answer: Option D

Explanation:

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44.

The exhaust valve in a four stroke cycle petrol engine

A.	opens at 50° before bottom dead centre and closes at 15° after top dead centre
B.	opens at bottom dead centre and closes at top dead centre
C.	opens at 50° after bottom dead centre and closes at 15° before top dead centre
D.	may open and close anywhere

Answer: Option A

Explanation:

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45.

The ratio of the volume of charge admitted at N.T.P. to the swept volume of the piston is called

A.	mechanical efficiency
B.	overall efficiency
C.	volumetric efficiency
D.	relative efficiency

Answer: Option C

Explanation:

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46.

The thermal efficiency of a standard Otto cycle for a compression ratio of 5.5 will be

A.	25%
B.	50%
C.	70%
D.	100%

Answer: Option B

Explanation:

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47.

In hit and miss governing, the fuel supply is cut-off completely during one or more number of cycles.

A.	Yes
B.	No
C.	Good
D.	Both

Answer: Option A

Explanation:

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48.

In a four stroke cycle, the minimum temperature inside the engine cylinder occurs at the

A.	beginning of suction stroke
B.	end of suction stroke
C.	beginning of exhaust stroke
D.	end of exhaust stroke

Answer: Option A

Explanation:

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