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）
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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
A.safety valve
B.blow down valve
C.scum valve
D.feed check valve
最新試題
The usual symptoms of cavitation in a centrifugal pump is （）.
If the thermal bulb of an expansion valve is incorrectly placed at the center of the coil instead of the end, it will （）.
A salinity indicator is used to determine the （）.
If the viscosity of the liquid being transferred remains constant as the discharge pressure increases, the rotary pump （）.
One cause of high head pressure occurring in a refrigeration system can be （）.
A salinity indicator is used to determine the （）.
The rate of heat transfer from a hot region to a cold region is affected most by the （）.
An excessive charge of refrigerant in an air-cooled refrigeration system can cause （）.
Which of the following statements is correct concerning heat transfer?（）
Which of the listed pumps is NOT a positive displacement pump?（）