Cetane number 65
Octane number 65
Cetane number 35
Octane number 35
B. Octane number 65
Low density
Low temperature
Long ignition delay
All of these
Requires smaller foundation
Is lighter
Consumes less lubricating oil
All of these
Spark
Injected fuel
Heat resulting from compressing air that is supplied for combustion
Ignition
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
Temperature at which it solidifies or congeals
Temperature at which it catches fire without external aid
Indicated by 90% distillation temperature, i.e. when 90% of sample oil has distilled off
Hit and miss governing
Qualitative governing
Quantitative governing
Combination of (B) and (C)
1/2
1
2
4
More efficient
Less efficient
Equally efficient
Other factors will decide it
Mechanical efficiency
Overall efficiency
Indicated thermal efficiency
Volumetric efficiency
Same
Less
More
Variable
Fuel pump
Injector
Carburettor
None of these
Piston ring and cylinder wear
Formation of hard coating on piston skirts
Oil sludge in the engine crank case
Detonation
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
Temperature at which it solidifies or congeals
It catches fire without external aid
Indicated by 90% distillation temperature, i.e., when 90% of sample oil has distilled off
250°C
500°C
1000°C
2000°C
0.3 to 0.7 mm
0.2 to 0.8 mm
0.4 to 0.9 mm
0.6 to 1.0 mm
Opens at 20° before top dead center and closes at 35° after the bottom dead center
Opens at top dead center and closes at bottom dead center
Opens at 10° after top dead center and closes 20° before the bottom dead center
May open or close anywhere
Not effected
Decrease
Increase
None of these
Half
Same
Double
Four times
F.P. = B.P. - I.P.
F.P. = I.P. - B.P.
F.P. = B.P./I.P.
F.P. = I.P./B.P.
Below 50%
Between 50 and 85%
Between 85 and 95%
Between 95 and 100%
Have no effect on
Increase
Decrease
None of these
Calorific value of oil
Low heat value of
High heat value of oil
Mean heat value of oil
Decrease
Increase
Remain same
None of these
0
50
100
120
Low
Very low
High
Very high
Not run
Run more efficiently
Run at high speed
Explode
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
SEA 30
SAE 50
SAE 70
SAE 80
Plates
Pallets
Pins
All of these
Supercharger
Centrifugal pump
Natural aspirator
Movement of engine piston
Morse test
Prony brake test
Motoring test
Heat balance test