The thermal efficiency of diesel engines is about

A. 15 %

B. 30 %

C. 50 %

D. 70 %

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  1. Number of working strokes per min. for a four stroke cycle engine are _________ the speed of the engine…
  2. Which of the following does not relate to a spark ignition engine?
  3. A diesel engine has
  4. If the speed of the engine is increased, the indicated power will
  5. Supercharging is the process of
  6. The calorific value of gaseous fuels is expressed in terms of
  7. Scavenging is usually done to increase
  8. In a petrol engine, the mixture has the lowest pressure at the
  9. Which one of the following event would reduce volumetric efficiency of a vertical compression ignition…
  10. The octane number of petrol, generally available, is
  11. Installation of supercharger on a four cycle diesel engine can result in the following percentage increase…
  12. The spark ignition engines are governed by
  13. The rating of a diesel engine, with increase in air inlet temperature, will
  14. Diesel as compared to petrol is
  15. Iso-octane (C8H18) has octane number of
  16. In petrol engines, advancing of the spark timing will _________ the knocking tendency.
  17. The advancing of spark timing in spark ignition engines will _________ knocking tendency.
  18. The knocking in spark ignition engines can be reduced by
  19. Which of the following statements is correct?
  20. The pressure at the end of compression, in petrol engines, is approximately
  21. A diesel engine has compression ratio from
  22. Pour point of fuel oil is the
  23. A petrol engine has compression ratio from
  24. Fuel consumption of diesel engines is not guaranteed at one quarter load because at such low loads
  25. The two reference fuels used for cetane rating are
  26. The ratio of the volume of charge admitted at N.T.P. to the swept volume of the piston is called
  27. In a coil ignition system of petrol engines, a condenser is connected across the contact breaker in…
  28. Pick up the wrong statement about supercharging
  29. Air fuel ratio at which a petrol engine cannot work is
  30. In order to prevent knocking in spark ignition engines, the charge away from the spark plug should have