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Internal Combustion Engines

Internal Combustion Engines
The probability of knocking in diesel engines is increased by

Low volatility
All of these
High self ignition temperature
Higher viscosity

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Internal Combustion Engines
A 75 cc engine has following parameter as 75 cc

Lube oil capacity
Cylinder volume
Swept volume
Fuel tank capacity

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Internal Combustion Engines
Scavenging is usually done to increase

Speed
Fuel consumption
Power output
Thermal efficiency

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Internal Combustion Engines
The mechanical efficiency (ηm) of the engine is given by

ηm = (B.P × I.P)/100
ηm = B.P/I.P
ηm = I.P/B.P
None of these

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Internal Combustion Engines
The ratio of the volume of charge admitted at N.T.P. to the swept volume of the piston is called

Overall efficiency
Volumetric efficiency
Relative efficiency
Mechanical efficiency

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Internal Combustion Engines
Diesel engine can work on very lean air fuel ratio of the order of 30: 1. A petrol engine can also work on such a lean ratio provided

Cannot work as it is impossible
Best quality fuel is used
Flywheel size is proper
It is properly designed

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