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Mechanical Engineering Objective Questions { Internal Combustion Engines }

176. The ignition coil in diesel engines produces voltage of the order of
A.6 to 12 volts
B.240 volts
C.1000 volts
D.20,000 volts
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177. If the door of a diesel engine crankcase is opened just after shutdown before cooling of engine, then
A.Efficiency of engine will be poor
B.There is a risk of explosion taking place
C.It is the safest practice
D.Some parts may be subjected to thermal stresses
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178. The thermal efficiency of a diesel engine is of the order of
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179. Theoretically, the following engine should have maximum efficiency
A.Gas engine
B.4-stroke C.I. engine
C.4-stroke S.I. engine
D.Steam engine
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180. The part load efficiency of a carburetor is,
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181. In petrol engine using a fixed octane rating fuel and fixed compression ratio, supercharging will
A.Increase the knocking tendency
B.Decrease the knocking tendency
C.Not affect the knocking tendency
D.Increase or decrease knocking tendency depending on strength and time of spark
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182. In open combustion chamber in diesel engines
A.The shape and layout of the piston crown, the inlet port, and the valve produce the turbulent effect on fuel mixture
B.Fuel is injected into an auxiliary chamber that is separated from the cylinder by an orifice or throat
C.Only a part of air charge is contained in an auxiliary chamber in which the fuel starts to burn with insufficient air which due to explosion tendency mixes thoroughly into main cylinder charge
D.Fuel is injected at atmospheric pressure
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