| 1. | If the temperature of intake air in internal combustion engine increases, then its efficiency will ? | |
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remain same
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decrease
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increase
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none
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Report Question| 2. | A supercharged engine as compared to an ordinary engine ? | |
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is lighter
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requires smaller foundations
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consumes less lubricating oil
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all of these
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| 3. | In order to mix air and petrol in the required proportion and to supply it to the engine during suction stroke, then.............. is employed ? | |
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fuel pump
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injector
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carburettor
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none of these
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| 4. | The ignition of the charge by some hot surface within the engine before the passage of spark is called ? | |
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pre-ignition
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detonation
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ignition delay
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auto-ignition
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| 5. | The firing order in an I.C. engine depends upon ? | |
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arrangement of the cylinders
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design of crankshaft
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number of cylinders
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all of these
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| 6. | The knocking in diesel engines may be prevented by ? | |
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reducing the delay period
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raising the compression ratio
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increasing the inlet pressure of air
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all of these
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| 7. | In an internal combustion engine, the process of removing the burnt gases from the combustion chamber of the engine cylinder is known as ? | |
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scavenging
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detonation
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supercharging
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polymerisation
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| 8. | Pre-ignition is caused by the spontantaneous combustion of the mixture before the end of the compression stroke, and is due to ? | |
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cylinder walls being too hot
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overheated spark plug points
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red hot carbon deposits on cylinder walls
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any one of these
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| 9. | Uranium has isotopes ? | |
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U234
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U235
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U238
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all of these
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| 10. | The effective inhibitor of pre-ignition is ? | |
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alcohol
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water
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lead
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none of these
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