229) Thermal efficiency of a two stroke cycle engine is __________ a four stroke cycle engine.

equal to

less than

greater than

none of these

Answer is:

less than

is lighter

requires smaller foundations

consumes less lubricating oil

all of these

Answer is:

Explanation:

A supercharged engine as compared to an ordinary engine
* requires smaller foundation
* is lighter
* consumes less lubricating oil

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.

Answer is:

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

Answer is:

steam power plant

gas turbine power plant

hydro electric power plant

nuclear power plant

Answer is: