Question 31 : In a diesel engine, the duration between the time of injection and ignition, is known as
1. delay period
2. period of ignition
3. burning period
4. pre-ignition period
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Question 32 : The ratio of the volume of charge admitted at N.T.P. to the swept volume of the piston is called
1. overall efficiency
2. mechanical efficiency
3. relative efficiency
4. volumetric efficiency
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Question 33 : The material most commonly used for shielding is
1. Carbon
2. Concrete
3. Lead
4. All of the mentioned
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Question 34 : The object of supercharging the engine is
1. to increase the power output of an engine when greater power is required
2. to reduce mass of the engine per brake power
3. to reduce space occupied by the engine
4. all of the mentioned
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Question 35 : Reflector in nuclear power plants __________ neutron leakage.
1. increases
2. decreases
3. has no effect
4. all of the mentioned
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Question 36 : The ignition quality of petrol is expressed by
1. Cetane number
2. Octane number
3. Calorific Value
4. None of the mentioned
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Question 37 : The two reference fuels used for cetane rating are
1. cetane & iso-octane
2. cetane & normal heptane
3. cetane & alpha methyl naphthalene
4. cetane & tetra ethyl lead
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Question 38 : A higher compression ratio causes
1. increase in detonation
2. pre-ignition
3. an acceleration in the rate of combustion
4. any one of the mentioned
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Question 39 : The specific fuel consumption per B.P. hour for a petrol engine is about
1. 0.2 kg
2. 0.25 kg
3. 0.3 kg
4. 0.35 kg
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Question 40 : If the temperature of intake air in internal combustion engine increases, then its efficiency will
1. remain same
2. increase
3. decrease
4. none of the mentioned
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