chapter 4 Flashcards
In the Electrode type boiler
a. Heat is generated by electrical current passing through heating elements
b. Heat is generated by electrical current passing through the boiler water
c. Heat is generated through a down-shot burner
d. Flue gases pass through the regulating chamber
b
Water treatment is considerably more critical for:
a. Immersion-type electric boilers
b. Electrode-type electric boilers
a
Electric boilers are approved for low pressure steam and hot water heating applications only
True False
false
A salinity feeder is an important component of a/n _________ boiler
a. Electrode electrical
b. Immersion electrical
c. Vertical firetube
d. Vertical tubeless
a
In the Electrode type boiler
a. Heat is generated by electrical current passing through heating elements
b. Flue gases pass through the regulating chamber
c. Heat is generated through a down-shot burner
d. Heat is generated by electrical current passing through the boiler water
d
In the electrode type electric boiler the electrodes are located in the:
A.Windbox
B.Firetube section
C.Watertube section
D.Firebox
E.Central generating chamber
e
An advantage of an electric boiler is the:
A.Inefficiency of the energy transfer
B.High cost of manufacturing
C.Requirement for duct work and chimneys
D.High cost of the electricity
E.Compactness of the boiler
e
A main disadvantage of an electric boiler is the:
A.Requirement for duct work and chimneys
B.High cost of manufacturing
C.Space requirement per unit output
D.High cost of the electricity
E.Inefficiency of the energy transfer
D
Since pure water will not conduct electricity a predetermined amount of electrolyte (_____) is dissolved in the water.
A.H2SO4
B.NaOH
C.NaSO3
D.NaCl
E.HCl
d
The load on an electrode-type electric boiler is maintained by the:
A.Amount of steam space in the boiler
B.Amount of current flowing through the elements
C.Amount of electrode covered by water
D.The voltage applied to the boiler
E.Outdoor temperature
c
In an immersion-type electric boiler scale tends to form on the:
A.Walls of the basket
B.Electrodes
C.Firetube bundles
D.Elements
E.Watertube bundles
d
An immersion-type electric boiler has:
A.No steam space
B.Water tubes
C.Tube bundles
D.Elements
E.Electrodes
d
Prior to the power being turned on in an electrode type electric boiler the water levels in the two chambers would be:
A.Lower in the fire tubes
B.The same in both chambers
C.Higher in the outer chamber
D.Higher in the inner chamber
E.Lower in the water tubes
b
Electric boilers:
A.Tend not to be very compact
B.Require tall stacks for pollution dispersement
C.Require soot blowers when the fuel is coal
D.Have energy conversion efficiencies close to 100%
E.Add to pollution with the production of ashes and smoke
d
The electrode type electric boiler consists of two cylindrical chambers:
A. The inner one forming the fire compartment and the other the generating compartment
B. The inner one forming the regulating compartment and the other the generating compartment
C. The inner one forming the generating compartment and the other the regulating compartment
D. The inner one forming the steam compartment and the other the generating compartment
E. The inner one forming the regulating compartment and the other the steam compartment
c
