Automobile Engineering in ME
In a four speed four stroke Diesel engine, the intake valve

opens at 20° before T.D.C. and closes at 35° after B.D.C.
opens at T.D.C. and closes at B.D.C.
opens at 10° after T.D.C. and closes at 20° before B.D.C.
not listed here

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Automobile Engineering in ME
The difference between DOT 3 and DOT 4 brake fluids is

DOT 3 and DOT 4 fluids have the same boiling point, but DOT 4 fluid has a longer service life
DOT 4 fluids have a lower boiling point than DOT 3 fluid
DOT 4 fluids have a higher boiling point than DOT 3 fluid
DOT 4 fluid is more resistant to freezing than DOT 3 fluid

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Automobile Engineering in ME
The ignition in a spark ignition engine takes place when the piston is

Approaching the T.D.C. position on its compression stroke
Exactly at the T.D.C. position on its compression stroke
Leaving the T.D.C. position on its compression stroke
Approaching the T.D.C position on its exhaust stroke

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Automobile Engineering in ME
The rigid suspension is beneficial when

It is desired to improve tyre to ground contact characteristics
It is desired to reduce the unsprung mass
Large changes in load make it necessary to have a large suspension stroke
It is desired to have more flexibility in design

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