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Mechanical Engineering
Internal Combustion Engines (Ic Engine)
Quiz 3
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Q.1
A carburettor is used to supply
petrol, air and lubricating oil
air and diesel
petrol and lubricating oil
petrol and air
Q.2
The increase of cooling water temperature in petrol engine will __________ the knocking tendency.
not effect
decrease
increase
Q.3
The pressure inside the cylinder is __________ the atmospheric pressure during the exhaust stroke.
equal to
below
above
Q.4
The self ignition temperature of petrol is __________ as compared to diesel oil.
same
lower
higher
Q.5
A diesel engine has
one valve
two valves
three valves
four valves
Q.6
The effective inhibitor of pre-ignition is
alcohol
water
lead
none of these
Q.7
The compensating jet in a carburettor supplies almost constant amount of petrol at all speeds because the
jet area is automatically varied depending on the suction
the flow from the main jet is diverted to the compensating jet with increase in speed
the diameter of the jet is constant and the discharge coefficient is invariant
flow is produced due to the static head in the float chamber
Q.8
In petrol engine, using a fixed octane rating fuel and fixed compression ratio, supercharging will __________ the knocking tendency.
not effect
decrease
increase
Q.9
The detonating tendency in petrol engines increases with increase of compression ratio.
True
False
Q.10
Where reactor operation is designed with fast neutrons such as in reactors using highly enriched fuel, the moderator used is
heavy water
graphite
carbon dioxide
no moderator is needed
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