Question 61 : Solid fuel fabricated into various small shapes, which are assembled to form fuel elements, is in the form of
1. pallets
2. plates
3. all of these
4. pins
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Question 62 : A diesel engine is __________ as compared to petrol engine, both running at rated load.
1. equally efficient
2. less efficient
3. all of above
4. more efficient
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Question 63 : Which of the following statement is correct ?
1. Petrol engines work on Otto cycle.
2. Compression ratio for petrol engines varies from 6 to 10.
3. all of the above
4. Higher compression ratio in diesel engines results in higher pressures
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Question 64 : Which one of the following event would reduce volumetric efficiency of a vertical compression ignition engine ?
1. inlet valve opening before top dead centre
2. exhaust valve closing after top dead centre
3. inlet valve closing before bottom dead centre
4. inlet valve closing after bottom dead centre
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Question 65 : The pressure at the end of compression, in petrol engines, is approximately
1. 35 bar
2. 25 bar
3. 20 bar
4. 10 bar
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Question 66 : In petrol engines, the delay period is of the order of
1. 0.001 second
2. 0.004 second
3. 0.002 second
4. 0.003 second
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Question 67 : In a four stroke cycle petrol engine, the pressure inside the engine cylinder during the suction stroke is __________ the atmospheric pressure.
1. equal to
2. below
3. above
4. middle
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Question 68 : A fuel of cetane number 40 has the same ignition quality as a mixture of
1. 40% petrol and 60% diesel
2. 40% diesel and 60% petrol
3. 40% cetane and 60% alpha methyl napthalene
4. 40% alpha methyl napthalene and 60% cetane
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Question 69 : The two reference fuels used for cetane rating are
1. cetane and iso-octane
2. cetane and alpha-methyl naphthalene
3. cetane and normal heptane
4. cetane and tetra ethyl lead
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Question 70 : The injector nozzle of a compression ignition engine is required to inject fuel at a sufficiently high pressure in order to
1. all of the above
2. ensure that penetration is not high
3. inject fuel in a chamber of high pressure at the end of compression stroke
4. inject fuel at a high velocity to facilitate atomisation
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