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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