Book 1: 1-04 "Electric Boilers" Flashcards
An advantage of an electric boiler is the:
Select one:
A. High cost of manufacturing
B. Inefficiency of the energy transfer
C. Requirement for duct work and chimneys
D. Compactness of the boiler
E. High cost of the electricity
D. Compactness of the boiler
Since pure water will not conduct electricity a predetermined amount of electrolyte (_____) is dissolved in the water.
Select one:
A. NaCl
B. HCl
C. NaOH
D. NaSO3
E. H2SO4
A. NaCl
An immersion-type electric boiler has:
Select one:
A. Electrodes
B. Water tubes
C. Tube bundles
D. Elements
E. No steam space
D. Elements
The electrode type electric boiler consists of two cylindrical chambers:
Select one:
A. The inner one forming the steam compartment and the other the generating compartment
B. The inner one forming the fire compartment and the other the generating compartment
C. The inner one forming the regulating compartment and the other the steam compartment
D. The inner one forming the regulating compartment and the other the generating compartment
E. The inner one forming the generating compartment and the other the regulating compartment
E. The inner one forming the generating compartment and the other the regulating compartment
In the electrode type electric boiler the electrodes are located in the:
Select one:
A. Firebox
B. Firetube section
C. Windbox
D. Central generating chamber
E. Watertube section
D. Central generating chamber
A main disadvantage of an electric boiler is the:
Select one:
A. Requirement for duct work and chimneys
B. Space requirement per unit output
C. Inefficiency of the energy transfer
D. High cost of the electricity
E. High cost of manufacturing
D. High cost of the electricity
Prior to the power being turned on in an electrode type electric boiler the water levels in the two chambers would be:
Select one:
A. Lower in the fire tubes
B. The same in both chambers
C. Higher in the outer chamber
D. Lower in the water tubes
E. Higher in the inner chamber
B. The same in both chambers
Output of an immersion electric boiler is regulated by altering the:
Select one:
A. Water level relative to the electrodes
B. The voltage applied to the boiler
C. Water level relative to the elements
D. Amount of current flowing through the elements
E. Amount of current flowing through the water
D. Amount of current flowing through the elements
The load on an electrode-type electric boiler is maintained by the:
Select one:
A. Amount of steam space in the boiler
B. Amount of current flowing through the elements
C. Outdoor temperature
D. The voltage applied to the boiler
E. Amount of electrode covered by water
E. Amount of electrode covered by water
In an immersion-type electric boiler scale tends to form on the:
Select one:
A. Firetube bundles
B. Electrodes
C. Walls of the basket
D. Elements
E. Watertube bundles
D. Elements
Electric boilers:
Select one:
A. Tend not to be very compact
B. Require tall stacks for pollution dispersement
C. Add to pollution with the production of ashes and smoke
D. Require soot blowers when the fuel is coal
E. Have energy conversion efficiencies close to 100%
E. Have energy conversion efficiencies close to 100%
The electrode type electric boiler consists of two cylindrical chambers:
Select one:
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 steam compartment and the other the generating compartment
D. The inner one forming the generating compartment and the other the regulating compartment
E. The inner one forming the regulating compartment and the other the steam compartment
D. The inner one forming the generating compartment and the other the regulating compartment
In an immersion-type electric boiler scale tends to form on the:
Select one:
A. Firetube bundles
B. Elements
C. Walls of the basket
D. Electrodes
E. Watertube bundles
B. Elements
The load on an electrode-type electric boiler is maintained by the:
Select one:
A. The voltage applied to the boiler
B. Outdoor temperature
C. Amount of steam space in the boiler
D. Amount of current flowing through the elements
E. Amount of electrode covered by water
E. Amount of electrode covered by water
A main disadvantage of an electric boiler is the:
Select one:
A. Inefficiency of the energy transfer
B. High cost of the electricity
C. Space requirement per unit output
D. Requirement for duct work and chimneys
E. High cost of manufacturing
B. High cost of the electricity
