162. Diesel engines as compared to petrol engines require
A.Bigger flywheel
B.Smaller flywheel
C.Same size flywheel
D.No flywheel

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163. Auto-ignition reaction time for petrol engine first decreases with increase in fuel air ratio, reaches a minimum value and then increases with subsequent increase in fuel air ratio. The minimum value occurs in the region of
A.Lean mixture
B.Chemically correct fuel air ratio
C.Rich mixture
D.Unpredictable

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164. In petrol engine, increase of cooling water temperature will
A.Increase the knocking tendency
B.Decrease the knocking tendecny
C.Not affect the knocking tendency
D.Increase or decrease knocking tendency depending on strength and time of spark

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165. With increase in engine speed, the ignition of spark in petrol engine has to be
A.Unaltered
B.Increased
C.Decreased
D.Advanced

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166. In petrol engines, the maximum power is developed corresponding to relative fuel air ratio of
A.0.85
B.1
C.1.1 to 1.3
D.1.2 to 1.5

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167. In petrol engine using fuel having fixed octane rating, increase in compression ratio will
A.Increase the knocking tendency
B.Decrease the knocking tendency
C.Not affect the knocking tendency
D.Increase or decrease knocking tendency depending on strength and time of spark

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168. In carburetors, the top of the fuel jet with reference to the level in the float chamber is kept at
A.Same level
B.Slightly higher level
C.Slightly lower level
D.May be anywhere

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