INTERNAL COMBUSTION ENGINE OBJECTIVE/ MULTIPLE CHOICE QUESTIONS
Q41. Violent sound pulsations within the cylinder of an I.C. engine are caused due to
(a) heavy turbulence
(b) improved scavenging
(c) heavy supercharging
Q42. In order to prevent knock in the S.I. engines, the charge away from the spark plug should have
(a) low temperature
(b) low density
(c) long ignition delay
(d) all of the above.
Q43. According to Recardo’s theory, detonation occurs due to
(a) instantaneous auto-ignition of last part of charge to be burnt
(b) improper mixing of air and fuel
(c) improper combustion
(d) self ignition temperature has nothing to do with detonation
Q44. Injection lag is
(a) the time taken by fuel after injection (before top dead center) to reach upto auto-ignition temperature
(b) time before actual fuel injection and the pump plunger starts to pump fuel
(c) time corresponding to actual injection and top dead center
(d) time corresponding to actual ignition and top dead center
Q45. Freezing temperature of petrol is usually
(b) – 10°C
(d) less than – 30°C
Q46. The efficiency of I.C. engines normally is of the order of
Q47. The ash content in diesel oil should bot be more than
Q48. The cooling water requirement for diesel engine is of the order of
(a) 0.2 to 1.0 liter per minute per h.p.
(b) 1 to 3 liters per minute per h.p.
(c) 5 to 10 liters per minute per h.p
(d) 10 to 20 liters per minute per h.p.
Q49. With increa.se in speed of vehicle, the back pressure will
(c) remain unalfected
(d) depend on other factors
Q50. Air injection in I.C. engines refers to injection of
(a) air only
(b) liquid fuel only
(c) liquid fuel and air
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