by increasing the contents of U₂₃₅

by slowing down fast neutrons so that U₂₃₅ fission continues by slow neutron

by increasing the contents of U₂₃₅ and by slowing down fast neutrons so that U₂₃₅ fission continues by slow neutron

none of these

equal to

less than

greater than

none of these

is lighter

requires smaller foundations

consumes less lubricating oil

all of these

30 kW four-stroke petrol engine running at 1500 r.p.m.

30 kW two-stroke petrol engine running at 1500 r.p.m.

30 kW two-stroke diesel engine running at 750 r.p.m.

30 kW four-stroke diesel engine running at 750 r.p.m.

increase in the rate of heat transfer, there is a reduction in the power output and efficiency of the engine

excessive turbulence which removes most of the insulating gas boundary layer from the cylinder walls

high intensity of knock causes crankshaft vibration and the engine runs rough

none of the above