單項選擇題

The purpose of the safety relief valves installed on an auxiliary boiler is to （）.

A.relieve excess fuel oil pressure during the “off” fire cycle
B.admit water to the dry pipe
C.throttle the forced draft fan output for proper combustion
D.reduce excess steam pressure in the boiler

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單項選擇題

The pH value of water in a diesel engine closed cooling water system should be maintained between （）.

A.60 to75
B.80 to 95
C.100 to 115
D.120 to 135

單項選擇題

Indirect cooling of fuel injector nozzle holders for diesel engines is accomplished primarily by （）.

A.heat conduction into the injected fuel oil
B.heat conduction into the water jacket wall
C.water circulation through passages in the holder
D.fuel oil circulation through passages in the holder

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The purpose of the safety relief valves installed on an auxiliary boiler is to （）.

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The pH value of water in a diesel engine closed cooling water system should be maintained between （）.

Indirect cooling of fuel injector nozzle holders for diesel engines is accomplished primarily by （）.