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Mechanical Engineering :: IC Engine and Nuclear Power Plants

  1. In a petrol engine, the mixture has the lowest pressure at the

  2. A.
    beginning of suction stroke
    B.
    end of suction stroke
    C.
    end of compression stroke
    D.
    none of these

  3. Which of the following does not relate to a spark ignition engine ?

  4. A.
    Ignition coil
    B.
    Spar kplug
    C.
    Carburettor
    D.
    Fuel injector

  5. The increase in intake temperature of internal combustion engines will __________ efficiency.

  6. A.
    have no effect on
    B.
    increase
    C.
    decrease

  7. The reflectivity depends upon

  8. A.
    geometry of the reflector
    B.
    energy of neutrons
    C.
    properties of the reflector
    D.
    all of these

  9. The indicated power for multi-cylinder engine will be same as that of a single cylinder engine.

  10. A.
    True
    B.
    False

  11. In order to prevent knocking in spark ignition engines, the charge away from the spark plug should have

  12. A.
    low density
    B.
    low temperature
    C.
    long ignition delay
    D.
    all of these

  13. The size of a reactor at which the chain reaction can be initiated (i.e. when system becomes critical) with just enough fissionable material (called critical mass of fuel) is known as critical size of reactor.

  14. A.
    Correct
    B.
    Incorrect

  15. The mechanical efficiency (ηm) of the engine is given by

  16. A.
    B.
    C.
    D.
    none of these

  17. A gas engine has a swept volume of 300 cm3 and clearance volume of 25 cm3. Its volumetric efficiency is 0.88 and mechanical efficiency is 0.90. The volume of the mixture taken in per stroke is

  18. A.
    248 cm3
    B.
    252 cm3
    C.
    264 cm3
    D.
    286 cm3