Detonation is harmful due to

A. Increase in the rate of heat transfer, there is a reduction in the power output and efficiency of the engine

B. Excessive turbulence which removes most of the insulating gas boundary layer from the cylinder walls

C. High intensity of knock causes crankshaft vibration and the engine runs rough

D. None of the above

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  2. Pre-ignition is caused by the spontaneous combustion of the mixture before the end of the compression…
  3. In the crankcase method of scavenging, the air pressure is produced by
  4. Iso-octane (C8H18) has octane number of
  5. A mixture containing 65% of iso-octane and 35% of normal heptane will have
  6. In a petrol engine, if diesel is used, then the engine will
  7. The advancing of spark timing in spark ignition engines will _________ knocking tendency.
  8. The firing order in an I.C. engine depends upon
  9. In a four stroke cycle engine, the sequence of operations is
  10. The ignition quality of diesel oil is expressed by
  11. The maximum temperature in the I.C. engine cylinder is of the order of
  12. The sensing element in the control system of nuclear reactors measures the _________ of the neutron…
  13. The theoretically correct mixture of air and petrol is
  14. Diesel as compared to petrol is
  15. The cetane (C16H34) which is a straight chain paraffin, is assigned a cetane number of
  16. The specific fuel consumption per BH hour for a petrol engine is approximately
  17. The fuel in diesel engine is normally injected at pressure of
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  19. The pressure at the end of compression, in petrol engines, is approximately
  20. The thermal efficiency of a diesel cycle having fixed compression ratio, with increase in cut-off ratio…
  21. Engine pistons are usually made of aluminium alloy because it
  22. In a cycle, the spark lasts roughly for
  23. Number of working strokes per min. for a four stroke cycle engine are _________ the speed of the engine…
  24. Which of the following fuel has little tendency towards detonation?
  25. The ratio of the indicated thermal efficiency to the air standard efficiency is known as
  26. The object of supercharging the engine is
  27. If V₁ is the jet velocity and V₀ is the vehicle velocity, then the propulsive efficiency…
  28. The air standard efficiency of an I.C. engine depends on
  29. The air standard efficiency of an I.C. engine is given by (where r = Compression ratio, and γ =…
  30. Detonation is harmful due to