Retarding the spark
Increasing the engine speed
Both (A) and (B)
None of these
C. Both (A) and (B)
Cetane and iso-octane
Cetane and alpha-methyl naphthalene
Cetane and normal heptane
Cetane and tetra ethyl lead
Maximum pressure developed
Minimum pressure
Instantaneous pressure at any instant
Average pressure
Cetane number 65
Octane number 65
Cetane number 35
Octane number 35
30 to 40 %
40 to 60 %
60 to 70 %
75 to 90 %
Air only
Petrol only
A mixture of petrol and air
None of these
Low power will be produced
Efficiency will be low
Higher knocking will occur
Black smoke will be produced
Increase
Reduce
Not effect
None of these
Remain same
Decrease
Increase
None of these
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
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
Temperature at which it catches fire without external aid
Indicated by 90% distillation temperature, i.e. when 90% of sample oil has distilled off
Homogeneous
Heterogeneous
Both (A) and (B)
Laminar
Fuel pump
Injector
Carburettor
None of these
To distribute spark
To distribute power
To distribute current
To time the spark
Single cylinder petrol engine
Four stroke engine
Single cylinder diesel engine
Multi cylinder engine
Opens at 30° before bottom dead centre and closes at 10° after top dead centre
Opens at 30° after bottom dead centre and closes at 10° before top dead centre
Opens at bottom dead centre and closes at top dead centre
May open and close anywhere
Homogeneous
Heterogeneous
Both (A) and (B)
None of these
Same as
Smaller than
Bigger than
None of these
Fuel pump
Fuel injector
Spark plug
None of these
15 %
30 %
50 %
70 %
250°C
500°C
1000°C
2000°C
Vaporisation
Carburetion
Ionisation
Atomisation
To determine the information, which cannot be obtained by calculations
To conform the data used in design, the validity of which may be doubtful
To satisfy the customer regarding the performance of the engine
All of the above
Clearance volume
Volumetric efficiency
Ignition time
Effective compression ratio
Increase
Decrease
Be independent
May increase or decrease depending on other factors
Half the operating speed
One fourth of operating speed
250 - 300 rpm
60 - 80 rpm
6 to 10
10 to 15
15 to 25
25 to 40
2-stroke petrol engine
4-stroke petrol engine
Diesel engine
Steam turbine
0
50
100
120
Four stroke C.I. engine, four stroke S.I. engine, two stroke S.I. engine
Four stroke S.I. engine, four stroke C.I. engine, two stroke S.I. engine
Four stroke C.I. engine, two stroke S.I. engine, four stroke S.I. engine
Two stroke S.I. engine, four stroke S.I. engine, four stroke C.I. engine
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