Feeding more fuel
Heating incoming air
Scavenging
Supercharging
D. Supercharging
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
ηm = B.P/I.P
ηm = I.P/B.P
ηm = (B.P × I.P)/100
None of these
Higher
Lower
Remain unaffected
None of the above
130°
180°
230°
270°
Lean
Rich
Chemically correct
None of these
Mechanical efficiency
Overall efficiency
Indicated thermal efficiency
Volumetric efficiency
Equal to
One-half
Twice
Four-times
4-6 kg/cm² and 200-250°C
6-12 kg/cm² and 250-350°C
12-20 kg/cm² and 350-450°C
20-30 kg/cm² and 450-500°C
248 cm3
252 cm3
264 cm3
286 cm3
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
Higher maximum temperature
Qualitative governing
Quantitative governing
Hit and miss governing
6 kg/cm
12 kg/cm
20 kg/cm
35 kg/cm
Cetane number 65
Octane number 65
Cetane number 35
Octane number 35
Morse test
Prony brake test
Motoring test
Heat balance test
Vaporisation
Carburetion
Ionisation
Atomisation
1500 rpm
750 rpm
3000 rpm
Any value independent of engine speed
Peak pressure
Rate of rise of pressure
Rate of rise of temperature
Peak temperature
1000 km/h
2000 km/h
2400 km/h
3000 km/h
Is lighter
Wear is less
Absorbs shocks
Is stronger
Low heat value of oil
High heat value of oil
Net calorific value of oil
Calorific value of fuel
75% iso-octane and 25% normal heptane
75% normal heptane and 25% iso-octane
75% petrol and 25% diesel
75% diesel and 25% petrol
Pre-ignition period
Delay period
Period of ignition
Burning period
20 to 40
40 to 60
60 to 80
80 to 100
Same as
Smaller than
Bigger than
None of these
Ignition coil
Spark plug
Carburettor
Fuel injector
Scavenging
Detonation
Supercharging
Polymerisation
In the engine cylinder
At the crank shaft
At the crank pin
None of these
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
Iso-octane and alpha-methyl naphthalene
Normal octane and aniline
Isooctane and normal hexane
Normal heptane and isooctane