A.drop as the boiler warms up
B.rise as the boiler warms up
C.remain unchanged until the boiler is hot enough
D.rise and fall with the steam demand
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A.filled with water
B.purged
C.cleared of air
D.None of the above is true
A.Safety valves
B.Water tubes
C.Steam stop valves
D.Blow down valves
A.water-tube
B.fire-tube
C.exhaust gas
D.None of the above is true
A.water-tube
B.fire-tube
C.exhaust gas
D.none of the above
A.scaled
B.informed
C.leaky
D.deformed
最新試題
The major source of chemical contaminants in hydraulic fluid is （）.
When the steering gear is in operation, you should （）.
An excessive charge of refrigerant in an air-cooled refrigeration system can cause （）.
Heavy wear in a particular area of the inner circumference of a packing ring may be caused by （）.
If the suction pressure at the refrigeration compressor is below normal, the cause can be（）.
Thermostatic expansion valves can be adjusted for （）.
The usual symptoms of cavitation in a centrifugal pump is （）.
An internal bypass is provided on some hydraulic system suction strainers to help reduce the possibility of （）.
If you are given the job of adding hydraulic fluid to a mooring winch, and are not certain as to the type of fluid to use, you should （）.
The control mode in which the final control element is moved from one of two flexed positions to the other is known as （）.