Question 71 : Reflector in nuclear power plants __________ neutron leakage.
1. increases
2. have no effect on
3. all of the above
4. decreases
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Question 72 : In order to eliminate knocking in compression ignition engines, there should be
1. high self ignition temperature of fuel
2. late auto-ignition
3. low compression ratio
4. short delay period
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Question 73 : The specific fuel consumption per B.P. hour for a petrol engine is about
1. 0.3 kg
2. 0.35 kg
3. 0.2 kg
4. 0.25 kg
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Question 74 : Number of working strokes per min. for a two stroke cycle engine are __________ the speed of the engine in r.p.m.
1. four-times
2. one-half
3. twice
4. equal to
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Question 75 : he material most commonly used for sheilding is
1. lead
2. carbon
3. concrete
4. all of these
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Question 76 : The scavenging efficiency of a tour stroke cycle diesel engine is
1. between 85 and 95%
2. between 95 and 100%
3. between 50 and 85%
4. below 50%
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Question 77 : The voltage required to produce a spark across the gap, between the sparking points is
1. 6000 to 10 000 volts
2. 4000 to 6000 volts
3. 2000 to 4000 volts
4. 10 000 to 12 000 volts
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Question 78 : The control rods in the control system of nuclear reactors are used to
1. control fuel consumption
2. control temperature
3. absorb excess neutrons
4. all of these
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Question 79 : If the speed of the engine is increased, the indicated power will
1. decrease
2. all of these
3. remain same
4. increase
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