| 1. | Enriched uranium is required as a fuel in a nuclear reactor, if light water is used as moderator and coolant, because light water has ? | |
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high neutron absorption cross-section
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low moderating efficiency
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high neutron scatter cross-section
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low neutron absorption cross-section
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Report Question| 2. | By higher octane number of spark ignition fuel, it is near ? | |
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higher heating value
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higher flash point
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lower volatility
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longer Ignition delay
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| 3. | The ratio of the indicated thermal efficiency to the air standard efficiency is known as ? | |
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mechanical efficiency
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overall efficiency
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volumetric efficiency
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relative efficiency
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| 4. | The ratio of the work obtained at the crankshaft in a given time to the energy supplied during the same time is called ? | |
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mechanical efficiency
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overall efficiency
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indicated thermal efficiency
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volumetric efficiency
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| 5. | Which one of the following engines will have heavier flywheel than the remaining ones ? | |
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30 kW four-stroke petrol engine running at 1500 r.p.m.
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30 kW two-stroke petrol engine running at 1500 r.p.m.
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30 kW two-stroke diesel engine running at 750 r.p.m.
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30 kW four-stroke diesel engine running at 750 r.p.m.
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| 6. | A power plant giving least running cost of production of electrical power is ? | |
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steam power plant
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gas turbine power plant
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hydro electric power plant
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nuclear power plant
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| 7. | The knocking in spark ignition engines can be reduced by ? | |
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retarding the spark
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increasing the engine speed
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both (a) and (b)
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none of these
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| 8. | The air-fuel ratio of the petrol engine is controlled by ? | |
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carburettor
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injector
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governor
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none of these
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| 9. | Which of the following fuel detonates readily ? | |
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Benzene
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Iso-octane
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Normal heptane
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Alcohol
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| 10. | A diesel engine has compression ratio from ? | |
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6 to 10
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10 to 15
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15 to 25
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25 to 40
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