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Mechanical Engineering Objective Questions { Internal Combustion Engines }

183. The basic requirement of a good combustion chamber is
A.High compression ratio
B.High power output and high thermal efficiency
C.Low volumetric efficiency
D.Minimum turbulence
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184. Deposition of carbon in petrol engine cylinder would result in increase of
A.Clearance volume
B.Swept volume
C.Compression ratio
D.Volumetric efficiency
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185. Which of the following engines can work on very lean mixture
A.S.I. engine
B.C.I. engine
C.Two stroke engine
D.Four stroke engine
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186. If petrol is used in a diesel engine, then
A.Higher knocking will occur
B.Efficiency will be low
C.Low power will be produced
D.Black smoke will be produced
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187. Hot air standard diesel cycle efficiency with increase in value of C
C.Remains unaffected
D.Depends on other factors
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188. In turbulence chamber in diesel engine
A.The shape and layout of the piston crown, the inlet port, and the valve produce the turbulent effect of 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.There are no valves
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189. For low load operation, more suitable (economical) engine is
A.S.I. engine
B.C.I. engine
C.Both are equally good
D.Multi-cylinder engine
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