1500 rpm
750 rpm
3000 rpm
Any value independent of engine speed
B. 750 rpm
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
B.P = (Wl × 2πN)/60 watts
B.P = [(W - S) πDN]/60 watts
B.P = [(W - S) π (D + d) N]/60 watts
All of these
Decreasing the density of intake air
Increasing the temperature of intake air
Increasing the pressure of intake air
Decreasing the pressure of intake air
The ratio of volumes of air in cylinder before compression stroke and after compression stroke
Volume displaced by piston per stroke and clearance volume in cylinder
Ratio of pressure after compression and before compression
Swept volume/cylinder volume
Equal to
Less than
Greater than
None of these
Compression ratio for petrol engines varies from 6 to 10
Higher compression ratio in diesel engines results in higher pressures
Petrol engines work on Otto cycle
All of the above
Hit and miss governing
Qualitative governing
Quantitative governing
Combination of (B) and (C)
Paraffin, aromatic, napthene
Paraffin, napthene, aromatic
Napthene, aromatics, paraffin
Napthene, paraffin, aromatic
Cylinder walls being too hot
Overheated spark plug points
Red hot carbon deposits on cylinder walls
Any one of these
Carburettor
Injector
Governor
None of these
Below 50%
Between 50 and 85%
Between 85 and 95%
Between 95 and 100%
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
Pre-ignition
Increase in detonation
Acceleration in the rate of combustion
Any one of these
0
50
100
120
Opens at top dead centre and closes at bottom dead centre
Opens at 20° before top dead centre and closes at 40° after bottom dead centre
Opens at 20° after top dead centre and closes at 20° before bottom dead centre
May open or close anywhere
Less difficult to ignite
Just about the same difficult to ignite
More difficult to ignite
Highly ignitable
Higher maximum temperature
Qualitative governing
Quantitative governing
Hit and miss governing
To reduce mass of the engine per brake power
To reduce space occupied by the engine
To increase the power output of an engine when greater power is required
All of the above
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
Diesel
Kerosene
Fuel oil
Gasoline
Decrease
Increase
Remain same
None of these
Opens at 15° after top dead centre and closes at 20° before bottom dead centre
Opens at 15° before top dead centre and closes at 20° after top dead centre
Opens at top dead centre and closes at bottom dead centre
May open and close anywhere
Detonation
Turbulence
Pre-ignition
Supercharging
Geometry of the reflector
Energy of neutrons
Properties of the reflector
All of these
Piston ring and cylinder wear
Formation of hard coating on piston skirts
Oil sludge in the engine crank case
Detonation
15 %
30 %
50 %
70 %
Naturally aspirated
Supercharged
Centrifugal pump
Turbo charger
0.3 to 0.7 mm
0.2 to 0.8 mm
0.4 to 0.9 mm
0.6 to 1.0 mm
Scavenging
Turbulence
Supercharging
Pre-ignition
Above the piston
Below the piston
Between the pistons
There is no such criterion