i c engines MCQs – Page 10

Practise focused i c engines questions with marked answers for exam preparation and subject revision.

i c engines Mcqs
181. Most high speed compression engines operate on ___________________?
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A. Two stroke cycle

B. Dual cycle

C. Otto cycle

D. Diesel cycle

E. Carnot cycle

182. Most high speed compression engines operate on __________________?
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A. Diesel cycle

B. Carnot cycle

C. Otto cycle

D. Dual combustion cycle

E. Special type of air cycle

183. The air requirement of a petrol engine during starting compared to theoretical airequired for complete combustion is___________________?
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A. loss

B. more

C. may be more or less depending on engine capacity

D. unpredictable

E. same

184. If the compression ratio of an engine working on Otto cycle is increased from 5 to 7, the %age increase in efficiency will be________________?
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A. 14%

B. 27%.

C. 4%

D. 8%

E. 2%

185. The m.e.p. of a petrol engine first increases as the fuel air ratio is increased and then decreases on further increase in fuel air ratio. The M.E.P is maximum in the zone of________________?
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A. rich mixture

B. unpredictable

C. none of the above

D. lean mixture

E. chemically correct mixture

186. The pistons are usually given a coating such as tin plating in order to________________?
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A. increase lubrication effect

B. reduce possibility of scoring

C. conduct heat efficiently

D. reduce friction

E. reduce weight

187. Which of the following is not an interns combustion engine___________________?
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A. 2-stroke petrol engine

B. 4-stroke petrol engine

C. gas turbine

D. diesel engine

E. steam turbine
188. When crude oil is heated, then which of the following hydrocarbon is given off first______________?
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A. gasoline

B. diesel

C. natural gas

D. paraffin

E. kerosene

189. With increase in engine speed, the ignition of spark in petrol engine has to be __________________?
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A. Increased

B. Decreased

C. Unaltered

D. Advanced
190. If petrol is used in a diesel engine, then______________?
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A. low power will be produced

B. efficiency will be low

C. black smoke will be produced

D. lot of fuel will remain unburnt

E. higher knocking will occur
191. In precombustion chamber in diesel engine________________?
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A. 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

B. The shape and layout of the pistion crown, the inlet port, and the valve produce the turbulent effect of fuel mixture

C. There are no valves

D. Fuel is injected into an auxiliary chamber that is separated from the cylinder by an orifice or throat

192. The thermal efficiency of a semi-diesel cycle having fixed compression ratio and fixed quantity of heat, with increase in pressure ratio will_______________?
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A. increase

B. remain unaffected

C. decrease

D. first increase and then decrease

E. increase/decrease depending upon engine capacity

193. The following type of carburettor is preferred_______________?
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A. none of the above

B. eccentric type

C. horizontal type

D. concentric type

E. vertical type

194. The theoretically correct mixture of air and petrol is approximately ________________?
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A. 0.500694444

B. 0.625694444

C. 0.834027778

D. 0.334027778

195. Pick up false statement?
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A. For petrol and large gas engines, quantity governingds preferred

B. In quantity governing, air fuel ratio is almost constant and quantity of charge is changed depending on load

C. In hit and miss governing, fuel supply is completely cut off during one or more number of cycles

D. In quality governing, quantity of fuel is varied to suit the load and total charge of air is varied

E. For close regulation of speed, combination of both quality and quantity governing is used

196. Diesel Cycle is also known as : __________?
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A. Constant Pressure Cycle

B. All of above

C. Constant Volume cycle

D. Constant temperature cycle

197. In a diesel engine, injection pressure developed by injector is of the order of______________?
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A. 1400 kg/cm2

B. 100 kg/cm2

C. 10 kg/cm2

D. 500 kg/cm2

198. In the case of compression ignition engine, the %age of CO in exhaust gases is________________?
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A. Zero

B. Depends on load

C. 5-10%

D. Considerable percent

199. The patrol is distilled at a temperature from :
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A. 6 to 20

B. 15 to 120

C. 220 to 345

D. 65 to 220
200. The natural solid fuels are : ________?
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A. All of above

B. Peat

C. Wood

D. Lignite