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Internal Combustion Engines

Internal Combustion Engines
Number of working strokes per min. for a four stroke cycle engine are _________ the speed of the engine in r.p.m.

Four-times
Twice
Equal to
One-half

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Internal Combustion Engines
The fuels in order of decreasing knock tendency for spark ignition engines are

Paraffin, napthene, aromatic
Napthene, paraffin, aromatic
Napthene, aromatics, paraffin
Paraffin, aromatic, napthene

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

Cylinder volume
Lube oil capacity
Fuel tank capacity
Swept volume

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Internal Combustion Engines
Which of the following medium is compressed in a Diesel engine cylinder?

Air and fuel
Air alone
Air and lub oil
Fuel alone

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Internal Combustion Engines
The basic requirement of a good combustion chamber is

Low compression ratio
Minimum turbulence
Low volumetric efficiency
High thermal efficiency and power output

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Internal Combustion Engines
The reference fuels for knock rating of spark ignition engines would include

Normal octane and aniline
Normal heptane and iso-octane
Iso-octane and alpha-methyl naphthalene
Iso-octane and normal hexane

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