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Mechanical Engineering
Internal Combustion Engines (I.C. Engines)
Quiz 8
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Q.1
In a four stroke cycle engine, the sequence of operations is
Suction, compression, expansion and exhaust
Suction, expansion, compression and exhaust
Expansion, compression, suction and exhaust
Compression, expansion, suction and exhaust
Q.2
In loop scavenging, the top of the piston is
Flat
Contoured
Slanted
Depressed
Q.3
The specific fuel consumption per BHP hour for diesel engine is approximately
0.15 kg
0.2 kg
0.25 kg
0.3 kg
Q.4
The maximum propulsive efficiency of a turbojet engine is at a speed of
1000 km/h
2000 km/h
2400 km/h
3000 km/h
Q.5
The method of determination of indicated power of a multi cylinder spark ignition engine is by the use of
Morse test
Prony brake test
Motoring test
Heat balance test
Q.6
The air-fuel ratio of the petrol engine is controlled by
Fuel pump
Governor
Injector
Carburettor
Q.7
The actual volume of fresh charge admitted in 4-stroke petrol engine is
Equal to stroke volume
Equal to stroke volume and clearance volume
Less than stroke volume
More than stroke volume
Q.8
The ratio of the volume of charge admitted at N.T.P. to the swept volume of the piston is called
Mechanical efficiency
Overall efficiency
Volumetric efficiency
Relative efficiency
Q.9
The air-fuel ratio in petrol engines is controlled by
Controlling valve opening/closing
Governing
Injection
Carburetion
Q.10
A gas engine has a swept volume of 300 cm
3
and clearance volume of 25 cm
3
. Its volumetric efficiency is 0.88 and mechanical efficiency is 0.90. The volume of the mixture taken in per stroke is
248 cm
3
252 cm
3
264 cm
3
286 cm
3
Q.11
In order to prevent knocking in spark ignition engines, the charge away from the spark plug should have
Low density
Low temperature
Long ignition delay
All of these
Q.12
The inlet valve of a four stroke cycle internal combustion engine remains open for
130°
180°
230°
270°
Q.13
The pressure at the end of compression, in diesel engines, is approximately
10 bar
20 bar
25 bar
35 bar
Q.14
The pressure at the end of compression, in petrol engines, is approximately
10 bar
20 bar
25 bar
35 bar
Q.15
The turbine of the turboprop engine is __________ that of the turbojet engine.
Same as
Smaller than
Bigger than
None of these
Q.16
When crude oil is heated, then which of the following hydrocarbon is given off first?
Kerosene
Gasoline
Paraffin
Natural gas
Q.17
Air fuel ratio for idling speed of a petrol engine is approximately
1 : 1
5 : 1
10 : 1
15 : 1
Q.18
The specific fuel consumption per BH hour for a petrol engine is approximately
0.15 kg
0.2 kg
0.25 kg
0.3 kg
Q.19
Which one of the following event would reduce volumetric efficiency of a vertical compression ignition engine?
Inlet valve closing after bottom dead center
Inlet valve closing before bottom dead center
Inlet valve opening before top dead center
Exhaust valve closing after top dead center
Q.20
Which of the following does not relate to a compression ignition engine?
Fuel pump
Fuel injector
Governor
Carburettor
Q.21
Which of the following does not relate to a spark ignition engine?
Ignition coil
Spark plug
Carburettor
Fuel injector
Q.22
Engine pistons are usually made of aluminium alloy because it
Is lighter
Wear is less
Absorbs shocks
Is stronger
Q.23
The reason for supercharging in any engine is to
Increase efficiency
Increase power
Reduce weight and bulk for a given output
Effect fuel economy
Q.24
The output of a diesel engine can be increased without increasing the engine revolution or size in following way
Feeding more fuel
Heating incoming air
Scavenging
Supercharging
Q.25
The scavenging efficiency of a four stroke cycle diesel engine is
Below 50%
Between 50 and 85%
Between 85 and 95%
Between 95 and 100%
Q.26
Morse test can be conducted for
Petrol engines
Diesel engines
Multi cylinder engines
All of these
Q.27
The cetane (C₁₆H₃₄) which is a straight chain paraffin, is assigned a cetane number of
0
50
100
120
Q.28
Scavenging is usually done to increase
Thermal efficiency
Speed
Power output
Fuel consumption
Q.29
Which of the following medium is compressed in a Diesel engine cylinder?
Air alone
Air and fuel
Air and lub oil
Fuel alone
Q.30
Alpha-methyl-naphthalene (C₁₁ H₁₀) has a cetane number of
0
50
100
120
0 h : 0 m : 1 s
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