Higher
Lower
Remain unaffected
None of the above
A. Higher
Iso-octane and alpha-methyl naphthalene
Normal octane and aniline
Isooctane and normal hexane
Normal heptane and isooctane
Vaporisation
Carburetion
Ionisation
Atomisation
A four stroke cycle engine develops twice the power as that of a two stroke cycle engine
For the same power developed, a four stroke cycle engine is lighter, less bulky and occupies less floor area
The petrol engines are costly than diesel engines
All of the above
Starts at 15° before top dead centre and ends at 30° after top dead centre
Starts at top dead centre and ends at 30° after top dead centre
Starts at 15° after top dead centre and ends at 30° before bottom dead centre
May start and end anywhere
It is a standard fuel used for knock rating of diesel engines
Its chemical name is normal hexadecane
It has long carbon chain structure
All of the above
Prevent sparking across the gap between the points
Cause more rapid break of the primary current, giving a higher voltage in the secondary circuit
Both (A) and (B)
None of the above
Homogeneous
Heterogeneous
Both (A) and (B)
None of these
Increase maximum pressure and maximum temperature
Reduce maximum pressure and maximum temperature
Increase maximum pressure and decrease maximum temperature
Decrease maximum pressure and increase maximum temperature
Have no effect on
Increase
Decrease
None of these
Not effected
Decrease
Increase
None of these
Beginning of suction stroke
End of suction stroke
Beginning of exhaust stroke
End of exhaust stroke
Increase
Decrease
Remain same
None of these
Speed
Temperature
Volume of cylinder
m.e.p. and I.H.P.
High heat value
Low heat value
Net calorific value
Calorific value
Haphazard motion of the gases in the chamber
Rotary motion of the gases in the chamber
Radial motion of the gases in the chamber
None of the above
Calorific value of oil
Low heat value of
High heat value of oil
Mean heat value of oil
75% iso-octane and 25% normal heptane
75% normal heptane and 25% iso-octane
75% petrol and 25% diesel
75% diesel and 25% petrol
Alcohol
Water
Lead
None of these
Theoretical power
Actual power
Indicated power
None of these
2-stroke engine can run in any direction
In 4-stroke engine, a power stroke is obtained in 4-strokes
Thermal efficiency of 4-stroke engine is more due to positive scavenging
Petrol engines occupy more space than diesel engines for same power output
Same
Lower
Higher
None of these
Half the operating speed
One fourth of operating speed
250 - 300 rpm
60 - 80 rpm
Not effect
Decrease
Increase
None of these
5-10 kg/cm²
20-25 kg/cm²
60-80 kg/cm²
90-130 kg/cm²
F.P. = B.P. - I.P.
F.P. = I.P. - B.P.
F.P. = B.P./I.P.
F.P. = I.P./B.P.
Fuel pump
Governor
Injector
Carburettor
ηm = B.P/I.P
ηm = I.P/B.P
ηm = (B.P × I.P)/100
None of these
Cetane number
Octane number
Calorific value
None of these
Morse test
Prony brake test
Motoring test
Heat balance test
Air only
Diesel only
A mixture of diesel and air
None of these