In diesel engines, the ignition takes place due to the heat produced in the engine cylinder at the end of compression.
In petrol engines, using a fixed octane rating fuel, the increase in engine speed will decrease the knocking tendency.
A long delay period in compression ignition engines gives a more rapid rise in pressure which causes knocking.
The octane number of petrol, generally available, is
The air-fuel ratio of the petrol engine is controlled by
The fuels in order of decreasing knock tendency for spark ignition engines are
Detonation is harmful due to
A diesel engine has inlet valve, fuel injection valve and exhaust valve.
Materials which make good moderators do not make good reflectors.
A fission chain reaction in uranium can be developed
The brake power is the power available
If the compression ratio in I.C. engine increases, then its thermal efficiency will
The ratio of the work obtained at the crankshaft in a given time to the energy supplied during the same time is called
In a four stroke cycle diesel engine, the compression
The ignition of the charge by some hot surface within the engine before the passage of spark is called
Thermal efficiency of a two stroke cycle engine is __________ a four stroke cycle engine.
The slowing down of fast neutrons is desirable because slow moving neutrons are more effective than fast neutrons in triggering fission.
The relative efficiency of an I.C. engine is the ratio of the indicated thermal efficiency to the air standard efficiency.
Plutonium (Pu239) is produced
A power plant giving least running cost of production of electrical power is
In a four stroke cycle diesel engine, the inlet valve
Special reactors, called breeder reactors, supply a net gain of fissionable material.
A supercharged engine as compared to an ordinary engine
A power plant giving least running cost of production of electrical power is
The normal heptane (C7H16) is given a rating of __________ octane number.
The volumetric efficiency ofa well designed engine may be
A petrol engine has compression ratio from
The thermal efficiency of petrol and gas engines is about
The knocking in diesel engines may be prevented by
The ratio of the indicated thermal efficiency to the air standard efficiency is known as