Q. A nuclear reactor is said to be critical when the neutron population in the reactor core is

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Q. A long delay period in compression ignition engines gives a more rapid rise in pressure which causes knocking.

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Q. A fission chain reaction in uranium can be developed

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Q. Thermal efficiency of a two stroke cycle engine is __________ a four stroke cycle engine.

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Q. A supercharged engine as compared to an ordinary engine

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Q. Which one of the following engines will have heavier flywheel than the remaining ones?

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Q. In petrol engines, using a fixed octane rating fuel, the increase in engine speed will decrease the knocking tendency.

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Q. Materials which make good moderators do not make good reflectors.

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Q. The ignition of the charge by some hot surface within the engine before the passage of spark is called

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Q. Special reactors, called breeder reactors, supply a net gain of fissionable material.

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Q. The ratio of the indicated thermal efficiency to the air standard efficiency is known as

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Q. A diesel engine has inlet valve, fuel injection valve and exhaust valve.

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Q. In a four stroke cycle diesel engine, the compression

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Q. In a four stroke cycle diesel engine, the inlet valve

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Q. The knocking in diesel engines may be prevented by

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Q. The loud pulsating noise heard within the cylinder of an internal combustion engine is known as

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Q. The octane number of petrol, generally available, is

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Q. The brake power is the power available

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Q. The slowing down of fast neutrons is desirable because slow moving neutrons are more effective than fast neutrons in triggering fission.

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Q. The normal heptane (C7H16) is given a rating of __________ octane number.

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