i c engines MCQs – Page 8

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

i c engines Mcqs

141. Polymerisation is a chemical process in which molecules of a compound become________________?
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A. smaller

B. gaseous

C. larger

D. liquid

E. slowed down

142. Method of governing used in diesel engine is__________________?
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A. nit and miss governing

B. combined governing

C. quantity governing

D. quality governing

E. partial governing

143. The thermal efficiecny of a diesel cycle having fixed compression ratio, with increase in cut-off ratio will___________________?
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A. may increase or decrease depending on other factors

B. be independent

C. none of the above

D. increase

E. decrease

144. A diesel engine has_________________?
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A. 3 valves

B. 1 valve

C. 2 valves

D. no valve

E. 4 valves

145. The magneto in an automobile is basically__________________?
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A. transformer

B. capacitor

C. a.c. generator

D. d.c. generator

E. magnetic circuit

146. Which is more viscous lub oil_________________?
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A. SAE 80

B. SAE 4

C. SAE 50

D. SEA 30

E. SAE 70

147. For the same power developed in I.C. engines, the cheaper system is_____________?
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A. supercharged

B. naturally aspirated

C. centrifugal pump

D. turbo charger

E. none of the above

148. Pick up the wrong statement about supercharging __________________?
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A. supercharging is essential in aircraft engines

B. there can be limited supercharging in petrol engines because of detonation

C. supercharging reduces knocking in diesel engines

D. supercharging at high altitudes is essential

E. supercharging results in fuel economy

149. In petrol engine, increase of cooling water temperature will_________________?
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A. unpredictable

B. increase or decrease knocking tendency depedning on strength and time of spark

C. not affect the knocking tendency

D. decrease the knocking tendecny

E. increase the knocking tendency

150. If diesel is fed by mistake in the oil tank of a petrol engien, then engine will________________?
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A. knock

B. detonate

C. give lot of smoke

D. run for some time and then stop

E. not run

151. The specific fuel consumption per BHP hour for diesel engine is approximately___________________?
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A. 0.25 kg

B. 0.2 kg

C. 0.15 kg

D. 0.3 kg

E. 0.35 kg

152. The pressure and temperature at the end of compression stroke in a petrol engine are of the order of___________________?
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A. 6 12 kg/cm2 and 250 350C

B. 12 20 kg/cm2 and 350 450C

C. 20 30 kg/cm2 and 450 500C

D. 4 6 kg/cm2 and 200 250C

E. 30 40 kg/cm2 and 500 700C

153. In a naturally aspirated diesel engine, the air is supplied by________________?
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A. a vacuum chamber

B. a supercharger

C. forced chamber

D. an injection tube

E. a centrifugal blower

154. The spark plug gap is normally maintained at________________?
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A. 0.6 to 0.8 mm

B. 0.2 to 0.4 mm

C. 0.8 to 1 mm

D. 0.1 to 0.2 mm

E. 0.45 to 0.6 mm

155. High carbon content in diesel oil used for diesel engine leads to_________________?
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A. production of highly corrosive gases corroding the cylinder walls and exhaust system

B. excessive engine wear

C. damaging of both the storage tank and the engine

D. deposition on engine parts

E. none of the above.

156. Gaseous-fuel guarantees are based on___________________?
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A. high heat value of oil

B. low heat value of oil

C. calorific value of oil

D. mean heat value of oil

E. all of the above

157. Injection lag is_________________?
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A. time corresponding to actual ignition and top dead center

B. the time taken by fuel after injection (before top dead center) to reach upto auto-ignition temperature

C. time corresponding to actual injection and top dead center

D. time before actual fuel injection and the pump pluger starts to pump fuel

E. none of the above

158. Which of the following statements is correct ?
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A. All the irreversible engines have same efficiency

B. All the reversible engines have same efficiency

C. Both Rankine and Caront cycles have same efficiency between same temperature limits

D. All reversible engines working between same temperature limits have same-efficiency

E. Between same temperature limits, both petrol and diesel engines have same efficiency

159. The knocking in diesel engines for given fuel, will be__________________?
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A. enhanced by increasing compression ratio

B. dependent on other factors

C. first enhanced by increasig compression ratio upto a limit beyond which it will be suppressed

D. enhanced by decreasing compression ratio

E. unaflected by compression ratio

160. Does the supply of scavenging air at a density greater than that of atmosphere mean engine is supercharged ?
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A. depends on other factors

B. no

C. to some extent

D. unpredictable

E. yes

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