Increase linearly
Decrease linearly
Increase parabolically
Decrease parabolically
B. Decrease linearly
Half
Same
Double
Four times
White
Bluish
Black
Violet
Four stroke C.I. engine, four stroke S.I. engine, two stroke S.I. engine
Four stroke S.I. engine, four stroke C.I. engine, two stroke S.I. engine
Four stroke C.I. engine, two stroke S.I. engine, four stroke S.I. engine
Two stroke S.I. engine, four stroke S.I. engine, four stroke C.I. engine
40% cetane and 60% alpha methyl naphthalene
40% alpha methyl naphthalene and 60% cetane
40% petrol and 60% diesel
40% diesel and 60% petrol
Equally efficient
Less efficient
More efficient
None of these
Inlet valve closing after bottom dead centre
Inlet valve closing before bottom dead centre
Inlet valve opening before top dead centre
Exhaust valve closing after top dead centre
Equal to
Less than
Greater than
None of these
0
50
100
120
Controlling the air-fuel mixture
Controlling the ignition timing
Controlling the exhaust temperature
Reducing the compression ratio
2-stroke petrol engine
4-stroke petrol engine
Diesel engine
Steam turbine
Net efficiency
Efficiency ratio
Relative efficiency
Overall efficiency
15 %
30 %
50 %
70 %
Piston ring and cylinder wear
Formation of hard coating on piston skirts
Oil sludge in the engine crank case
Detonation
Supercharging reduces knocking in diesel engines
There can be limited supercharging in petrol engines because of detonation
Supercharging at high altitudes is essential
Supercharging results in fuel economy
One valve
Two valves
Three valves
Four valves
It is properly designed
Best quality fuel is used
Cannot work as it is impossible
Flywheel size is proper
Ignition coil
Spark plug
Carburettor
Fuel injector
2-stroke cycle engines
4-stroke cycle engines
Aeroplane engines
High efficiency engines
Arrangement of the cylinders
Design of crankshaft
Number of cylinders
All of these
Decrease
Increase
Remain same
None of these
0.001 second
0.002 second
0.003 second
0.004 second
Increase in the rate of heat transfer, there is a reduction in the power output and efficiency of the engine
Excessive turbulence which removes most of the insulating gas boundary layer from the cylinder walls
High intensity of knock causes crankshaft vibration and the engine runs rough
None of the above
Otto cycle
Diesel cycle
Dual cycle
Carnot cycle
Compression starts at 35° after bottom dead center and ends at top dead center
Compression starts at bottom dead center and ends at top dead center
Compression starts at 10° before bottom dead center and, ends just before top dead center
May start and end anywhere
1 : 1
5 : 1
10 : 1
15 : 1
Flat
Contoured
Slanted
Depressed
6 : 1
9 : 1
12 : 1
15 : 1
Temperature
Volume
Density
None of these
[2(V₀/V₁)]/ [1 + (V₀/V₁)²]
(V₀/V₁)/ [1 + (V₀/V₁)²]
V₀/(V₀ + V₁)
V₁/(V₀ + V₁)
Low
Very low
High
Very high