Question 41 : In compression ignition engines, swirl denotes a
1. Haphazard motion of the gases in the chamber
2. Rotary motion of the gases in the chamber
3. Radial motion of the gases in the chamber
4. None of the mentioned
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Question 42 : Nuclear Reactors are used
1. to produce heat for thermoelectric power
2. to propel ships, submarines, aircrafts
3. to produce fissionable material
4. all of the mentioned
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Question 43 : The exhaust valve in a four stroke cycle petrol engine
1. opens at 50° after bottom dead centre and closes at 15° before top dead centre
2. opens at 50° before bottom dead centre and closes at 15° after top dead centre
3. opens at bottom dead centre and closes at top dead centre
4. may open and close anywhere
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Question 44 : Reactors for propulsion applications are designed for
1. any form of uranium
2. natura uranium
3. enriched uranium
4. thorium
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Question 45 : Where reactor operation is designed with fast neutrons such as in reactors using highly enriched fuel, the moderator used is
1. Carbon dioxide
2. Heavy Water
3. Graphite
4. No moderator is needed
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Question 46 : The brake power of a diesel engine, keeping other parameters constant, can be increased by
1. increasing the pressure of intake air
2. decreasing the density of intake air
3. decreasing the pressure of intake air
4. increasing the temperature of intake air
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Question 47 : Solid fuel fabricated into various small shapes, which are assembled to form fuel elements, is in the form of
1. pallets
2. plates
3. pins
4. all of the mentioned
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Question 48 : Which of the following statement is correct?
1. Compression ratio for petrol engines varies from 6 to 10
2. Petrol engines work on Otto cycle
3. Higher compression ratio in diesel engines results in higher pressures
4. All of the mentioned
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Question 49 : The mean effective pressure obtained from engine indicator indicates the
1. maximum pressure developed
2. minimum pressure developed
3. Instantaneous pressure at any point
4. Average pressure
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Question 50 : The reference fuels for knock rating of spark ignition engines would include
1. normal octane and aniline
2. iso-octane and normal hexane
3. iso-octane and alpha-methyl naphthalene
4. normal heptane and iso-octane
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