i c engines MCQs – Page 9

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

i c engines Mcqs
161. Ignition quality of diesel-fuel oil is expressed by an index called__________________?
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A. octane number

B. calorific value

C. carbon content

D. ignition temperature

E. cetane number
162. If overhead clearance is less, then the following type of engine should be selected__________________?
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A. Radial

B. Vertical

C. V-type

D. Horizontal

E. In-line

163. For the same size and weight, a two stroke engine as compared to four stroke engine will generate power_________________?
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A. about 1.7 times

B. about 0.5 times

C. about twice

D. nearly equal

E. about 5 times

164. The cooling water requirement for diesel engine is of the order of________________?
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A. 10 to 20 liters per minute per h.p.

B. 5 to 10 liters per minute per h.p

C. 1 to 3 liters per minute per h.p.

D. 20-30 liters per minute per h.p

E. 0.2 to 1.0 liter per minute per h.p.

165. The precess of breaking up or a lipuid into fine droplets by spraying is called___________________?
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A. ionisation

B. injection

C. atomisation

D. vaporisation

E. carburetion

166. The pressure at the end of compression in the case of diesel engine is of the order of___________________?
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A. 27.5 kg/cmz

B. 20 kg/cmz

C. 12kg/cmz

D. 6 kg/cm

E. 35 kg/cm
167. A 75 cc engine has following parameter as 75 cc ___________________?
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A. clearance volume

B. lub oil capacity

C. fuel tank capacity

D. cylinder volume

E. swept volume
168. With increase in speed of vehicle, the back pressure will________________?
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A. depend on other factors

B. remain unalfected

C. none of the above

D. increase

E. decrease

169. Self-ignition temperature of petrol is of the order of___________________?
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A. 450C

B. 370C

C. 240C

D. more than 500C.

E. 150C

170. Leakage past the piston rings and valve seats in I.C. engines with increase in speed_______________?
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A. unpredictable

B. increases.

C. remains same

D. none of the above

E. decreases
171. Theoretically, the following engine should have maximum efficiency________________?
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A. steam engine

B. 2-stroke S.I. engine

C. gas engine

D. 4-stroke C.I. engine

E. 4-stroke S.I. engine

172. The specific fuel consumption of a petrol engine compared to diesel engine of same H.P. is_______________?
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A. more

B. less or more depending on operating conditions

C. less

D. unpredictable

E. same

173. The cam shaft of a four stroke I.C. engine running at 1500 rmp will run at __________________?
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A. 1500 rpm

B. any value independent of engine speed

C. 750 rpm

D. none of the above

E. 3000 rpm

174. In order to prevent knock in the S.I. engines, the charge away from the spark plug should have___________________?
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A. rich mixture

B. all of the above

C. low density

D. long ignition delay

E. low temperature

175. Diesel engines have low specific fuel consumption compared to petrol engine. This statement is____________________?
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A. not true

B. true at full load

C. true at part load

D. true at both part and full load

E. there could not be any such criterion

176. The accunmulation of carbon in a cylinder results in increase of________________?
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A. volumetric efficiency

B. effective compression ratio

C. valve travel time.

D. clearance volume

E. ignition time

177. The rating of a diesel engine, with increase in airintlet temperature, will ___________________?
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A. decrease linearly

B. increase linearly

C. increase parabolically

D. first decrease linearly and then increase parabolically

E. decrease parabolically

178. In diesel engine, the compression ratio in comparison to expansion ratio is_______________?
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A. more/less depending on engine capacity.

B. more

C. less

D. same

E. variable

179. For low load operation, more suitable (economical) engine is_______________?
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A. S.I. engine

B. C.I. engine

C. both are equally good

D. multicylinder engine

E. two stroke engine

180. The ratio of indicated thermal efficiency to the corresponding air standard cycle efficiency is called__________________?
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A. cycle efficiency

B. efficiency ratio

C. relative efficiency

D. overall efficiency

E. net efficiency