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Rivers University Power Engineering 4th Class Certificate
Another method used to produce seamless tubes is known as ______ _.
Select one:
A. cold rolling
B. extrusion
C. polishing
D. casting
B
A pressure controller maintains a constant furnace pressure in a boiler, at all
loads, by adjusting the position of the _____ dampers.
Select one:
A. outlet
B. inlet
C. air
D. burner
A
,In a fluidized bed boiler, combustion can take place at temperatures ranging from
____°C to ___ °C instead of normal combustion temperatures of 1600°C to 1900°C
for pulverized coal and oil firing.
Select one:
A. 300 , 500
B. 200 , 400
C. 800 , 900
D. 600 , 700
C
In the ____ scrubbing process, the heat of the flue gas is used to dry finely
atomized slurry of alkaline reactants.
Select one:
A. dry
B. wet
C. liquid
D. absorption
A
The secondary air is admitted to the burner housing surrounding the central
nozzle through adjustable ___ _.
Select one:
A. vanes
B. orifices
C. louvers
D. openings
A
,_ _____ happens when the pressure, at any point inside a centrifugal pump, drops
below the vapour pressure of the liquid, vapour bubbles will form, creating
cavities in the liquid flow.
Select one:
A. Cavitation
B. Surging
C. Priming
D. Chirping
A
In a fuel flow – airflow combustion control system, the fuel and airflows are
measured directly and are converted to ________ signals by means of square root
extractors.
Select one:
A. digital
B. parallel
C. proportional
D. output
C
Recovery systems for the removal of SO2 can be classified into two major types:
Select one:
A. solid, liquid
B. wet, dry
C. large, small
D. adsorption, absorption
B
, The _______ steel carries the weight of the steam drum and the major pressure
components.
Select one:
A. structural
B. main
C. mild
D. welded
A
One method of burning _____ is called fluidized bed combustion.
Select one:
A. liquids
B. wood
C. methane
D. coal
D
There is no steam flow through the ______ tubes before the steam turbine has a
steam flow through it. Be careful not to increase boiler firing too rapidly and
overheat the reheat tubes, during startup.
Select one:
A. superheater
B. economizer
C. reheater
D. boiler
C