A.many thousand times larger than
B.the same as
C.many thousand times smaller
D.none of the above
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A.lube oil
B.fuel oil
C.turbine oil
D.grease
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
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