41. Morse test can be conducted for
A. petrol engines
B. diesel engines
C. multi-cylinder engines
D. all of these
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
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
44. The thermal efficiency of diesel engines on weak mixtures is
A. unaffected
B. lower
C. higher
D. dependent on other factors
45. The injection pressure in a diesel engine is about
A. 10 bar
B. 100 bar
C. 150 bar
D. 500 bar
46. High speed compression engines operate on
A. Otto cycle
B. Diesel cycle
C. Dual-combustion cycle
D. all of these
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
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
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
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