IC Engines Short Questions & Answers

Questions

41 The air requirement of a petrol engine during starting compared to theoretical airequired for complete combustion is___________________?

A more

B loss

C same

D may be more or less depending on engine capacity

View Answer

Answer: loss

42 The specific fuel consumption per BHP hour for diesel engine is approximately___________________?

A 0.15 kg

B 0.2 kg

C 0.25 kg

D 0.3 kg

View Answer

Answer: 0.2 kg

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43 Compression loss in I.C engines occurs due to_________________?

A leaking piston rings

B use of thick head gasket

C clogged air-inlet slots

D all of the above

View Answer

Answer: all of the above

44 The temperature of interior surface of cylinder wall in normal operation is not allowed to exceed____________________?

A 80°C

B 120°C

C 180°C

D 240°C

View Answer

Answer: 180°C

45 Combustion in compression ignition engines is____________________?

A homogeneous

B heterogeneous

C both A. and B.

D laminar

View Answer

Answer: heterogeneous

46 The thermal efficiecny of a diesel cycle having fixed compression ratio, with increase in cut-off ratio will___________________?

A increase

B decrease

C be independent

D may increase or decrease depending on other factors

View Answer

Answer: decrease

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

A 2%

B 4%

C 8%

D 14%

View Answer

Answer: 14%

48 The pressure at the end of compression in the case of diesel engine is of the order of___________________?

A 6 kg/cm

B 12kg/cmz

C 20 kg/cmz

D 35 kg/cm

View Answer

Answer: 35 kg/cm

49 In a typical medium speed 4-stroke cycle diesel engine the inlet valve_____________________?

A opens at 20° before top dead center and closes at 35° after the bottom dead center

B opens at top dead center and closes at bottom dead center

C opens at 10° after top dead center and closes 20° before the bottom dead center

D may open or close anywhere

View Answer

Answer: opens at 20° before top dead center and closes at 35° after the bottom dead center

50 An engine indicator is used to determine the following___________________?

A speed

B temperature

C volume of cylinder

D m.e.p. and I.H.P.

View Answer

Answer: m.e.p. and I.H.P.

51 If the intake air temperature of I.C. engine increases, its efficiency will_________________?

A increase

B decrease

C remain same

D unpredictable

View Answer

Answer: decrease

52 The ratio of indicated thermal efficiency to the corresponding air standard cycle efficiency is called__________________?

A net efficiency

B efficiency ratio

C relative efficiency

D overall efficiency

View Answer

Answer: relative efficiency

53 In a diesel engine, the fuel is ignited by___________________?

A spark

B injected fuel

C heat resulting from compressing air that is supplied for combustion

D ignition

View Answer

Answer: heat resulting from compressing air that is supplied for combustion

54 The air standard efficiency of an Otto cycle compared to diesel cycle for the given compression ratio is__________________?

A same

B less

C more

D more or less depending on power rating

View Answer

Answer: more

55 Does the supply of scavenging air at a density greater than that of atmosphere mean engine is supercharged ?

A yes

B no

C to some extent

D unpredictable

View Answer

Answer: no

56 Scavenging air in diesel engine means___________________?

A air used for combustion sent under pres-sure

B forced air for cooling cylinder

C burnt air containing products of combustion

D air used for forcing burnt gases out of engine’s cylinder during the exhaust period

View Answer

Answer: air used for forcing burnt gases out of engine’s cylinder during the exhaust period

57 The working cycle in case of four stroke engine is completed in following number of revolutions of crankshaft___________________?

A 1/2

B 1

C 2

D 4

View Answer

Answer: 2

58 The knock in diesel engine occurs due to____________________?

A instantaneous and rapid burning of the first part of the charge

B instantaneous atuo iginition of last part of charge

C delayed burning of the first part of the charge

D reduction of delay period

View Answer

Answer: instantaneous and rapid burning of the first part of the charge

59 Diesel engine can work on very lean air fuel ratio of the order of 30 : 1. A petrol engine can also work on such a lean ratio provided__________________?

A it is properly designed

B best quality fuel is used

C can not work as it is impossible

D flywheel size is proper

View Answer

Answer: can not work as it is impossible

60 A diesel engine has_________________?

A 1 valve

B 2 valves

C 3 valves

D 4 valves

View Answer

Answer: 3 valves

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