31. A diesel engine has

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

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

A. same
B. lower
C. higher

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

A. equal to
B. below
C. above

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

A. not effect
B. decrease
C. increase

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

36. U₂₃₃ is produced

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

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

38. The detonation is also called knocking or pinking.

A. Yes
B. No

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

A. Agree
B. Disagree

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