Question 1 : The effective inhibitor of pre-ignition is
1. lead
2. alcohol
3. water
4. none of these
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Question 2 : The thermal efficiency of diesel engines is about
1. 70%
2. 15%
3. 30%
4. 50%
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Question 3 : The purpose of testing an internal combustion engine is
1. to satisfy the customer regarding the performance of the engine
2. to determine the information, which can not be obtained by calculations
3. to conform the data used in design, the validity of which may be doubtful
4. all of the above
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Question 4 : In a diesel engine, the duration between the time of injection and ignition, is known as
1. pre-ignition period
2. period of ignition
3. burning period
4. delay period
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Question 5 : Where reactor operation is designed with fast neutrons such as in reactors using highly enriched fuel, the moderator used is
1. no moderator is needed
2. heavy water
3. carbon dioxide
4. graphite
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Question 6 : A moderator, in nuclear power plants, is a medium introduced into the fuel mass in order to
1. slow down the speed of fast moving neutrons
2. control the reaction
3. reduce the temperature
4. extract heat from nuclear reaction
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Question 7 : The compensating jet in a carburettor supplies almost constant amount of petrol at all speeds because the
1. the flow from the main jet is diverted to the compensating jet with increase in speed
2. the diameter of the jet is constant and the discharge coefficient is invariant
3. jet area is automatically varied depending on the suction
4. flow is produced due to the static head in the float chamber
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Question 8 : The expansion of fuel in a four stroke cycle diesel engine
1. may start and end anywhere
2. starts at 15° after top dead centre and ends at 30° before bottom dead centre
3. starts at 15° before top dead centre and ends at 30° after top dead centre
4. starts at top dead centre and ends at 30° after top dead centre
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Question 9 : 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 10 : Reactors for propulsion applications are designed for
1. any form of uranium
2. plutonium
3. enriched uranium
4. natura uranium
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