31. A diesel engine has

A. one valve
B. two valves
C. three valves
D. four valves

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32. The self ignition temperature of petrol is __________ as compared to diesel oil.

A. same
B. lower
C. higher

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33. The pressure inside the cylinder is __________ the atmospheric pressure during the exhaust stroke.

A. equal to
B. below
C. above

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34. The increase of cooling water temperature in petrol engine will __________ the knocking tendency.

A. not effect
B. decrease
C. increase

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35. A carburetor is used to supply

A. petrol, air and lubricating oil
B. air and diesel
C. petrol and lubricating oil
D. petrol and air

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36. U₂₃₃ is produced

A. artificially
B. as basic raw material
C. when thorium is irradiated by neutrons
D. by fission of U₂₃₈

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37. The pressure at the end of compression, in diesel engines, is approximately

A. 10 bar
B. 20 bar
C. 25 bar
D. 35 bar

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38. The detonation is also called knocking or pinking.

A. Yes
B. No

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39. The pre-ignition occurs before the spark is produced whereas detonation develops after the introduction of spark.

A. Agree
B. Disagree

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40. The energy released during the fission of one atom of Uranium – 235 in million electron volts is about

A. 100
B. 200
C. 300
D. 400

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