1 - rγ - 1
1 + rγ - 1
1 - (1/rγ - 1)
None of these
C. 1 - (1/rγ - 1)
Low power will be produced
Efficiency will be low
Higher knocking will occur
Black smoke will be produced
30 kW four-stroke petrol engine running at 1500 r.p.m.
30 kW two-stroke petrol engine running at 1500 r.p.m.
30 kW two-stroke diesel engine running at 750 r.p.m.
30 kW four-stroke diesel engine running at 750 r.p.m.
Is lighter
Requires smaller foundations
Consumes less lubricating oil
All of these
Increase
Decrease
Remain same
None of these
Higher
Lower
Remain unaffected
None of the above
Spark ignition
Compression ignition
Both (A) and (B)
None of these
Mechanical efficiency
Overall efficiency
Indicated thermal efficiency
Volumetric efficiency
Enhance flow rate
Control air flow
Induce primary swirl
Induce secondary turbulence
Requires smaller foundation
Is lighter
Consumes less lubricating oil
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
Half
Same
Double
Four times
75% iso-octane and 25% normal heptane
75% normal heptane and 25% iso-octane
75% petrol and 25% diesel
75% diesel and 25% petrol
2-stroke cycle engines
4-stroke cycle engines
Aeroplane engines
High efficiency engines
V₁/(V₀ + V₁)
V₀/(V₀ + V₁)
2V₀/(V₀ + V₁)
2V₁/(V₀ + V₁)
1 : 1
5 : 1
10 : 1
15 : 1
500-1000°C
1000-1500°C
1500-2000°C
2000-2500°C
Petrol engines
Diesel engines
Multi cylinder engines
All of these
15 %
30 %
50 %
70 %
Increase
Reduce
Not effect
None of these
Remain same
Decrease
Increase
None of these
Fuel pump
Fuel injector
Governor
Carburettor
2000 to 4000 volts
4000 to 6000 volts
6000 to 10,000 volts
10,000 to 12,000 volts
Benzene
Iso-octane
Normal heptane
Alcohol
Below 50%
Between 50 and 85%
Between 85 and 95%
Between 95 and 100%
Controlling the air-fuel mixture
Controlling the ignition timing
Controlling the exhaust temperature
Reducing the compression ratio
First a mild explosion followed by a bi explosion
First a big explosion followed by a mil explosion
Both mild and big explosions occurs simultaneously
Never occurs
2-stroke petrol engine
4-stroke petrol engine
Diesel engine
Steam turbine
20 to 25
25 to 30
30 to 40
40 to 55
8 : 1
10 : 1
15 : 1
20 : 1 and less
High self ignition temperature
Low volatility
Higher viscosity
All of these