A.lube oil
B.fuel oil
C.turbine oil
D.grease
您可能感兴趣的试卷
你可能感兴趣的试题
Which of the following may hardness of the boiler water cause?()
(1) scale formation
(2) tube failure
(3) corrosion
A.(1)and(2)
B.(1)and(3)
C.(2)and(3)
D.(1),(2)and(3)
A.higher than the actual drum water level
B.equal to the actual drum water level
C.increasing due to steam condensation in the glass
D.lower than actual drum water level
A.no combustion
B.deposits in the fuel
C.excessive air in the fuel
D.cold fuel oil
A.swell
B.shrinkage
C.flash off
D.lack of water
A.Water Head Register
B.Water Heater Re-circulating
C.Waste Heat Recovery
D.Waste Handle Reference
A.yellowish flame
B.golden yellow flame
C.milky flame
D.brilliant white flame
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
最新试题
Which of the problems listed would came the discharge temperature of an R-12 refrigeration compressor to increase?()
If the thermal bulb of an expansion valve is incorrectly placed at the center of the coil instead of the end, it will ().
The usual symptoms of cavitation in a centrifugal pump is ().
The rate of heat transfer from a hot region to a cold region is affected most by the ().
Thermostatic expansion valves can be adjusted for ().
A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by ().
Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?()
One cause of high head pressure occurring in a refrigeration system can be ().
On tank vessels equipped with power operated cargo tank valves, the type of power operator most commonly used is ().
The output volume of a positive fixed displacement pump can be changed only by ().