單項選擇題Prior to lighting off a cold automatically fired auxiliary boiler, you should （）.

A.check and regulate the water level
B.close the air cock once fires are lit
C.blowdown the gage glass
D.crack the steam stop to assure protective steam flow


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1.單項選擇題Which of the following statements describes the function of an expansion tank in a diesel engine cooling system?（）

A.Maintains a constant head on the system
B.Reduces the likelihood of air or steam pockets formation
C.Provides a low pressure point for the addition of makeup cooling water
D.All of the above

2.單項選擇題To minimize corrosion, fuel oil strainer disks, spacers and scraper blades are made of （）.

A.brass
B.copper
C.iron
D.monel metal or stainless steel

3.單項選擇題The expansion tank for a diesel engine closed cooling system is designed to maintain a constant head on the system and （）.

A.reduce water temperature
B.reduce water turbulence
C.provide an air cushion
D.allow for an increase in water volume as the engine warms up

4.單項選擇題For a continuous operation diesel engine, a duplex filter unit would be the best arrangement because （）.

A.changing filter elements would not interrupt engine operation
B.filtering occurs twice in each pass of oil through the system
C.clogging will not occur
D.dropping pressure is half of that through a single filter unit

5.單項選擇題An increase in the air inlet manifold pressure of a diesel engine will result in a/an （）.

A.decrease in maximum cylinder pressure
B.increase in ignition lag
C.decrease in fuel consumption per horsepower-hour
D.decrease in exhaust manifold pressure