41. Morse test can be conducted for

A. petrol engines
B. diesel engines
C. multi-cylinder engines
D. all of these

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42. The basic requirement of a good combustion chamber is

A. minimum turbulence
B. low compression ratio
C. high thermal efficiency and power output
D. low volumetric efficiency

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43. In a four stroke cycle petrol engine, the charge is compressed when both the valves (i.e. inlet valve and exit valve) are closed,

A. Agree
B. Disagree

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44. The thermal efficiency of diesel engines on weak mixtures is

A. unaffected
B. lower
C. higher
D. dependent on other factors

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45. The injection pressure in a diesel engine is about

A. 10 bar
B. 100 bar
C. 150 bar
D. 500 bar

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46. High speed compression engines operate on

A. Otto cycle
B. Diesel cycle
C. Dual-combustion cycle
D. all of these

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47. In a four stroke cycle petrol engine, the inlet valve

A. opens at top dead center and closes at bottom dead center
B. opens at 20° before top dead center and closes at 40° after bottom dead center
C. opens at 20° after top dead center and closes at 20° before bottom dead center
D. may open or close anywhere

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48. The nuclear power station at Tarapur has the reactor of the __________ type.

A. pressurized water
B. boiling water
C. gas cooled
D. liquid metal cooled

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49. In nuclear power plants, due to the reflector, less fuel is needed to generate sufficient neutrons to sustain a chain reaction.

A. Yes
B. No

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50. The secondary fuel used in nuclear power plants is

A. U₂₃₃ and Pu₂₃₉
B. U₂₃₅ and Th₂₃₂
C. U₂₃₅ and Pu₂₃₈
D. U₂₃₃ and Pu₂₃₈

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