Increase
Decrease
Be independent
May increase or decrease depending on other factors
B. Decrease
Low heat value of oil
High heat value of oil
Net calorific value of oil
Calorific value of fuel
Instantaneous and rapid burning of the first part of the charge
Instantaneous auto ignition of last part of charge
Delayed burning of the first part of the charge
Reduction of delay period
Air only
Diesel only
A mixture of diesel and air
None of these
Not effected
Decrease
Increase
None of these
Petrol engines
Diesel engines
Multi cylinder engines
All of these
0
50
100
120
Uniform throughout the mixture
Chemically correct mixture
About 35% of rich mixture
About 10% of rich mixture
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
Have no effect on
Increase
Decrease
None of these
Half
Same
Double
Four times
Same
More
Less
Less or more depending on operating conditions
30 to 40 %
40 to 60 %
60 to 70 %
75 to 90 %
Jet area is automatically varied depending on the suction
The flow from the main jet is diverted to the compensating jet with increase in speed
The diameter of the jet is constant and the discharge coefficient is invariant
Flow is produced due to the static head in the float chamber
Spark
Injected fuel
Heat resulting from compressing air that is supplied for combustion
Ignition
2 %
4 %
8 %
14 %
9 : 1
12 : 1
15 : 1
18 : 1
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
6 to 10
10 to 15
15 to 25
25 to 40
0.001 second
0.002 second
0.003 second
0.004 second
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
Speed
Temperature
Volume of cylinder
m.e.p. and I.H.P.
Air used for combustion sent under pressure
Forced air for cooling cylinder
Burnt air containing products of combustion
Air used for forcing burnt gases out of engine's cylinder during the exhaust period
75% iso-octane and 25% normal heptane
75% normal heptane and 25% iso-octane
75% petrol and 25% diesel
75% diesel and 25% petrol
Petrol, air and lubricating oil
Air and diesel
Petrol and lubricating oil
Petrol and air
Increase
Decrease
Be independent
May increase or decrease depending on other factors
0
50
100
120
Same
Less
More
More or less depending on power rating
Increase
Reduce
Not effect
None of these
Below 50%
Between 50 and 85%
Between 85 and 95%
Between 95 and 100%