IC Engine MCQs | IC Engine Short Questions and Answers

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Questions
41 The following volume of air is required for consuming 1 liter of fuel by a four stroke engine
A 1 m3
B 5 m3
C 5-6 m3
D 9-10 m3

Answer: 9-10 m3
42 A 5 BHP engine running at full load would consume diesel of the order of
A 0.3 kg/hr
B 1 kg/hr
C 3 kg/hr
D 5 kg/hr

Answer: 1 kg/hr
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43 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

Answer: can not work as it is impossible
44 A diesel engine has
A 1 valve
B 2 valves
C 3 valves
D 4 valves

Answer: 3 valves
45 A hmh flame speed is obtained in diesel engine when air fuel ratio is
A uniform throughout the mixture
B chemically correct mixture
C about 3-5% rich mixture
D about 10% rich mixture

Answer: about 10% rich mixture
46 Volatility of diesel fuel oil is
A minimum temperature to which oil is heated in order to give off inflammable vapours in sufficient quantity to ignite momentarily when brought in contact with a flame
B temperature at which it solidifies or congeals
C it catches fire without external aid
D indicated by 90% distillation temperature, i.e., when 90% of sample oil has distilled off

Answer: indicated by 90% distillation temperature, i.e., when 90% of sample oil has distilled off
47 Which is more viscous lub oil
A SEA 30
B SAE 4£
C SAE 50
D SAE 80

Answer: SAE 80
48 In loop scavenging, the top of the piston is
A flat
B contoured
C slanted
D depressed

Answer: contoured
49 In the crankcase method of scavenging, the air pressure is produced by
A supercharger
B centrifugal pump
C natural aspirator
D movement of engine piston

Answer: movement of engine piston
50 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

Answer: opens at 20° before top dead center and closes at 35° after the bottom dead center
51 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%

Answer: 14%
52 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.

Answer: m.e.p. and I.H.P.
53 The accunmulation of carbon in a cylinder results in increase of
A clearance volume
B volumetric efficiency
C ignition time
D effective compression ratio

Answer: increasing the compression ratio
54 When crude oil is heated, then which of the following hydrocarbon is given off first.
A kerosene
B gasoline
C paraffin
D natural gas

Answer: natural gas
55 The rating of a diesel engine, with increase in airintlet temperature, will
A increase linearly
B decrease linearly
C increase parabolically
D decrease parabolically

Answer: decrease linearly
56 Gaseous-fuel guarantees are based on
A calorific value of oil
B low heat value of oil
C high heat value of oil
D mean heat value of oil

Answer: low heat value of oil
57 Polymerisation is a chemical process in which molecules of a compound become
A larger
B slowed down
C smaller
D liquid

Answer: larger
58 In diesel engine, the compression ratio in comparison to expansion ratio is
A same
B less
C more
D variable

Answer: more
59 Engine pistons 'are usually made of aluminium alloy because it
A is lighter
B wears less
C absorbs shocks
D is stronger

Answer: is lighter
60 The size of inlet valve of.an engine in comparison to exhaust valve is
A more
B less
C same
D more/less depending on capacity of engine

Answer: less
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