As a heat engine, （) energy is the source of power by which a diesel enginecan be operate

Fuel is ignited in a diesel engine cylinder by _____.

A.a spark plug

B.injectors

C.the heat of compression

D.increasing jacket water temperatures

The steam engine gives us an example of heat ______ into work.

A．turns

B．turned

C．turning

D．being turned

The PRIMARY function of a waste heat boiler is to _____.

A.reduce engine exhaust noise

B.reduce engine back pressure

C.recover heat which otherwise would be lost

D.increase turbocharger efficiency

A.electric

B.heat

C.mechanical

D.exhaust

What does the speaker say to be aware of？

A．The engine's heat

B．The gas in the tank

C．The height of the car

D．The total travel time

A.over heat

B.over speed

C.over pressure

D.over worn

A.crankshaft

B.piston

C.connecting rod

D.bearing

Diesel engine waste heat boiler construction is usually of the fire-tube or .

A.cyclone furnace boiler type

B.dry back boiler type

C.water-tube type

D.critical circulation boiler type

A.prevent engine back pressure at heavy loads

B.increase total engine efficiency at low loads

C.prevent boiler corrosion at low engine loads

D.improve engine fuel consumption at any load