196) If the fuel is rich in fissionable material, the reactor can be made more compact than if the percentage of fissionable atoms is small.

197) The overall efficiency is defined as the ratio of the work obtained at the crankshaft in a given time to the energy supplied during the same time.

198) The cetane number of diesel oil, generally available, is

199) The object of providing masked inlet valve in the air passage of compression ignition engines is to

200) During suction stroke of a four stroke petrol engine, the inlet valve opens and the charge is sucked into the cylinder as the piston moves upwards from the bottom dead centre.