A.yellowish flame
B.golden yellow flame
C.milky flame
D.brilliant white flame
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As for an oil-fired boiler if at a normal steaming condition and water goes out of sight in gauge glasses the action you should take is: （）
(1) secure oil to fires
(2) increase feed pump pressure
A.（1）
B.（1）and（2）
C.（2）
D.neither（1）nor（2）
A.latent heat of condensation
B.latent heat of vaporization
C.latent heat of saturation
D.sensible heat of condensation
A.physical state
B.temperature
C.atmospheric pressure
D.sensible pressure
A.The blow down valve
B.The scum valve
C.The air release cock
D.The soot-blower
A.an diesel oil heater
B.a waste heat boiler
C.a fresh water generator
D.all the above
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An excessive charge of refrigerant in an air-cooled refrigeration system can cause （）.
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When the steering gear is in operation, you should （）.
An internal bypass is provided on some hydraulic system suction strainers to help reduce the possibility of （）.
If the head pressure of a reciprocating refrigeration compressor is excessive, （）.
An increasing head pressure in a refrigeration system, without any corresponding change in the cooling water inlet temperature, would probably be caused by （）.
A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by （）.
Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by （）.
Which of the problems listed would came the discharge temperature of an R-12 refrigeration compressor to increase?（）
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