The thermal efficiency of petrol and gas engines is about

Internal Combustion Engines
The thermal efficiency of petrol and gas engines is about

0.5

0.15

0.3

0.7

0.5

0.15

0.3

0.7

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Internal Combustion Engines
If the compression ratio in I.C. engine increases, then its thermal efficiency will

Decrease

Increase

None of these

Remain same

Decrease

Increase

None of these

Remain same

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Internal Combustion Engines
The term scavenging is generally associated with

High efficiency engines

Aeroplane engines

2-stroke cycle engines

4-stroke cycle engines

High efficiency engines

Aeroplane engines

2-stroke cycle engines

4-stroke cycle engines

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Internal Combustion Engines
The air standard efficiency of an I.C. engine is given by (where r = Compression ratio, and γ = Ratio of specific heats)

None of these

1 - rγ - 1

1 - (1/rγ - 1)

1 + rγ - 1

None of these

1 - rγ - 1

1 - (1/rγ - 1)

1 + rγ - 1

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Internal Combustion Engines
In a coil ignition system of petrol engines, a condenser is connected across the contact breaker in order to

None of these

Both (A) and (B)

Prevent sparking across the gap between the points

Cause more rapid break of the primary current, giving a higher voltage in the secondary circuit

None of these

Both (A) and (B)

Prevent sparking across the gap between the points

Cause more rapid break of the primary current, giving a higher voltage in the secondary circuit

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Internal Combustion Engines
Pour point of fuel oil is the

Indicated by 90% distillation temperature i.e., when 90% of sample oil has distilled off

It catches fire without external aid

Temperature at which it solidifies or congeals

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

Indicated by 90% distillation temperature i.e., when 90% of sample oil has distilled off

It catches fire without external aid

Temperature at which it solidifies or congeals

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

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Internal Combustion Engines

Internal Combustion Engines The thermal efficiency of petrol and gas engines is about

Internal Combustion Engines If the compression ratio in I.C. engine increases, then its thermal efficiency will

Internal Combustion Engines The term scavenging is generally associated with

Internal Combustion Engines The air standard efficiency of an I.C. engine is given by (where r = Compression ratio, and γ = Ratio of specific heats)

Internal Combustion Engines In a coil ignition system of petrol engines, a condenser is connected across the contact breaker in order to

Internal Combustion Engines Pour point of fuel oil is the

Internal Combustion Engines
The thermal efficiency of petrol and gas engines is about

Internal Combustion Engines
If the compression ratio in I.C. engine increases, then its thermal efficiency will

Internal Combustion Engines
The term scavenging is generally associated with

Internal Combustion Engines
The air standard efficiency of an I.C. engine is given by (where r = Compression ratio, and γ = Ratio of specific heats)

Internal Combustion Engines
In a coil ignition system of petrol engines, a condenser is connected across the contact breaker in order to

Internal Combustion Engines
Pour point of fuel oil is the