Larger
Slowed down
Smaller
Liquid
A. Larger
A fine fuel spray mixed with air is ignited by the heat of compression which is at a high pressure
The fuel supplied to the engine cylinder is mixed with necessary amount of air and the mixture in ignited with the help of a spark plug
The fuel is first evaporated after passing through a carburettor and is mixed with air before ignition
All of the above
Cetane number
Octane number
Calorific value
All of these
Requires smaller foundation
Is lighter
Consumes less lubricating oil
All of these
Thermal efficiency of diesel engine is about 34%
Theoretically correct mixture of air and petrol is approximately 15:1
High speed compression engines operate on dual combustion cycle
S.I. engines are quality governed engines
2000 to 4000 volts
4000 to 6000 volts
6000 to 10,000 volts
10,000 to 12,000 volts
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
Same as
Smaller than
Bigger than
None of these
Supercharging
Carburetion
Turbulence
Delay period
Diesel cycle
Otto cycle
Dual combustion cycle
Special type of air cycle
Increase
Decrease
Remain same
None of these
Same
Less
More
Variable
One valve
Two valves
Three valves
Four valves
High self ignition temperature
Low volatility
Higher viscosity
All of these
The friction is high
The friction is unpredictable
The small difference in cooling water temperature or in internal friction has a disproportionate effect
The engine is rarely operated
20 to 25
25 to 30
30 to 40
40 to 55
Air only
Diesel only
A mixture of diesel and air
None of these
1/2
1
2
4
Low heat value of oil
High heat value of oil
Net calorific value of oil
Calorific value of fuel
Homogeneous
Heterogeneous
Both (A) and (B)
None of these
30 to 40 %
40 to 60 %
60 to 70 %
75 to 90 %
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
Opens at top dead centre and closes at bottom dead centre
May open and close anywhere
All the irreversible engines have same efficiency
All the reversible engines have same efficiency
Both Rankine and Carnot cycles have same efficiency between same temperature limits
All reversible engines working between same temperature limits have same efficiency
Increase efficiency
Increase power
Reduce weight and bulk for a given output
Effect fuel economy
Napthene
Tetra ethyl lead
Amyl nitrate
Hexadecane
30° before top dead centre
30° after top dead centre
30° before bottom dead centre
30° after bottom dead centre
Temperature and pressure in the cylinder at the time of injection
Nature of the fuel mixture strength
Relative velocity between the fuel injection and air turbulence pressure of residual gases
All of the above
8 : 1
10 : 1
15 : 1
20 : 1 and less
Controlling valve opening/closing
Governing
Injection
Carburetion
Otto cycle
Diesel cycle
Dual combustion cycle
All of these
40% cetane and 60% alpha methyl naphthalene
40% alpha methyl naphthalene and 60% cetane
40% petrol and 60% diesel
40% diesel and 60% petrol