Question 21 : In a four stroke cycle, the minimum temperature inside the engine cylinder occurs at the
1. end of suction stroke
2. beginning of exhaust stroke
3. beginning of suction stroke
4. end of exhaust stroke
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Question 22 : The scavenging efficiency of a tour stroke cycle diesel engine is
1. between 50-85%
2. between 95-100%
3. below 50%
4. between 85-95%
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Question 23 : 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 24 : The operation of forcing additional air under pressure in the engine cylinder is known as
1. Supercharging
2. Scavenging
3. Turbulence
4. Pre-ignition
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Question 25 : The injector nozzle of a compression ignition engine is required to inject fuel at a sufficiently high pressure in order to
1. inject fuel at a high velocity to facilitate atomisation
2. inject fuel in a chamber of high pressure at the end of compression stroke
3. ensure that penetration is not high
4. all of the mentioned
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Question 26 : The maximum temperature in the I.C. engine cylinder is of the order of(in degree Celsius)
1. 500-1000
2. 1000-1500
3. 1500-2000
4. 2000-2500
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Question 27 : A diesel engine is __________ as compared to petrol engine, both running at rated load.
1. equally efficient
2. more efficient
3. less efficient
4. all of the mentioned
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Question 28 : A moderator generally used in nuclear power plants is
1. heavy water
2. concrete
3. graphite & concrete
4. graphite
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Question 29 : In order to eliminate knocking in compression ignition engines, there should be
1. high self-ignition temperature of fuel
2. late auto-ignition
3. short delay period
4. low compression ratio
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Question 30 : The pressure at the end of compression, in petrol engines, is approximately
1. 10 bar
2. 20 bar
3. 25 bar
4. 35 bar
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