Question 1 : The control rods in the control system of nuclear reactors are used to
1. control fuel consumption
2. absorb excess neutrons
3. control temperature
4. all of the mentioned
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Question 2 : In petrol engines, the delay period is of the order of
1. 0.001 sec
2. 0.002 sec
3. 0.003 sec
4. 0.004 sec
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Question 3 : The compensating jet in a carburettor supplies almost constant amount of petrol at all speeds because the
1. jet area is automatically varied depending on the suction
2. the flow from the main jet is diverted to the compensating jet with increase in speed
3. flow is produced due to the static head in the float chamber
4. the diameter of the jet is constant and the discharge coefficient is invariant
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Question 4 : In a four stroke cycle petrol engine, the charge is ignited at
1. 30° after bottom dead centre
2. 30° before bottom dead centre
3. 30° after top dead centre
4. 30° before top dead centre
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Question 5 : If the speed of the engine is increased, the indicated power will
1. increase
2. decrease
3. remain same
4. none of the mentioned
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Question 6 : The probability of knocking in diesel engines is increased by
1. high self-ignition temperature
2. low volatility
3. high viscosity
4. all the mentioned
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Question 7 : The voltage required to produce a spark across the gap, between the sparking points is
1. 2000-4000 volts
2. 4000-6000 volts
3. 6000-10000 volts
4. 10000-12000 volts
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Question 8 : The expansion of fuel in a four stroke cycle diesel engine
1. starts at 15° after top dead centre and ends at 30° before bottom dead centre
2. starts at top dead centre and ends at 30° after top dead centre
3. may start and end anywhere
4. starts at 15° before top dead centre and ends at 30° after top dead centre
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Question 9 : Number of working strokes per min. for a two stroke cycle engine are __________ the speed of the engine in r.p.m.
1. equal to
2. one-half
3. four-times
4. twice
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Question 10 : A fuel of cetane number 40 has the same ignition quality as a mixture of
1. 40% alpha methyl napthalene and 60% cetane
2. 40% cetane and 60% alpha methyl napthalene
3. 40% petrol and 60% diesel
4. 40% diesel and 60% petrol
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