單項選擇題Waterside scale in a fire-tube boiler may cause （）.

A.increased heat transfer
B.fireside erosion
C.high steam demand
D.overheated tubes


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1.單項選擇題The maximum pressure developed by a waste heat boiler is determined by the main engine exhaust （）.

A.gas composition
B.gas temperature
C.pressure
D.timing

2.單項選擇題Camshafts are usually driven by timing gears or （）.

A.push rods
B.chain drives
C.rocker arms
D.flywheels

3.單項選擇題A waste heat boiler is installed on some diesel propelled vessels to （）.

A.provide steam for emergency propulsion
B.provide steam for the turbo-generator
C.heat the waste water tanks
D.steam for warming engines

5.單項選擇題An electric heater built into some smaller diesel engines is used to （）.

A.raise lube oil viscosity for easier starting in cold weather
B.increase air inlet temperature
C.increase compression ratio
D.increase jacket water temperature for easier starting in cold weather