Power Engineering - 4B6 Practice Questions With Complete
Solutions
10. Cooling towers by design use:
a. softened water
b. lots of water
c. hard water
d. city water
e. very little water Correct Answers b. lots of water
32 2 3 Oxygen and Carbon Dioxide cause the following
condition in a boiler:
a. scale
b. carryover
c. sludge
d. corrosion Correct Answers d. corrosion
32 2 3 The process of passing the water through a steam flow in
a deaerator is known as:
a. scrubbing
b. scouring
c. sweeping
d. washing Correct Answers a. scrubbing
4 2 2 4 Total alkalinity is usually measured using the:
a. T-alkalinity test
b. M-alkalinity test
,c. P-alkalinity test
d. O-alkalinity test Correct Answers b. M-alkalinity test
A boiler has an M-alkalinity that is greater than the prescribed
control range. What is the appropriate operator response?
a. Increase the rate of sodium hydroxide feed.
b. Increase the rate of continuous blowdown.
c. Lower the boiler water level.
d. Reduce the frequency of bottom blowoff. Correct Answers b.
Increase the rate of continuous blowdown.
A common metal used for sacrificial anodes is:
a. zinc
b. silver
c. copper
d. lead Correct Answers a. zinc
A conductivity meter is used to measure the:
a. Alkalinity
b. Electrolyte
c. Hardness
d. Total Dissolved Solids Correct Answers d. Total Dissolved
Solids
A conductivity meter measures:
a. total alkalinity
b. hydroxide alkalinity (caustic alkalinity)
,c. total dissolved solids
d. total suspended matter Correct Answers c. total dissolved
solids
A continuous blow-off is
a. used on every boiler
b. used to reduce sludge
c. used to reduce the dissolved gases in the boiler
d. installed in the steam drum
e. installed in the lower drum Correct Answers d. installed in
the steam drum
A disadvantage of using glycol in heating or cooling systems
instead of water is that
a. all glycols are toxic
b. glycol has lower viscosity, so that fluid velocities increase.
c. glycol has a higher specific heat, so the systems run hotter
d. more powerful pumps are required Correct Answers d. more
powerful pumps are required
A disadvantage of using sodium sulphite in a boiler to remove
dissolved oxygen is that:
a. it produces corrosion
b. it increases the total dissolved solids in the boiler
c. it may increase caustic corrosion
d. it decreases the effect of the deaerator
e. it does not prevent scale build up Correct Answers b. it
increases the total dissolved solids in the boiler
, A filter should be backwashed in order to:
a. regenerate the filter
b. dissolve the suspended matter
c. transfer liquid in the opposite direction
d. flush the trapped impurities to waste
e. oxidize the water Correct Answers d. flush the trapped
impurities to waste
A low cost way to remove suspended solids, normally associated
with ground water, is by use of a:
a. settling pond
b. reverse osmosis system
c. demineralizer
d. hot lime soda softener Correct Answers a. settling pond
A measure of the cloudiness of the water is known as:
a. clarity
b. turbidity
c. neutrality
d. visibility Correct Answers b. turbidity
A method of treatment, which is often used in conjunction with
settling tanks, is:
a. deaeration
b. zeolite softening
c. demineralizing
Solutions
10. Cooling towers by design use:
a. softened water
b. lots of water
c. hard water
d. city water
e. very little water Correct Answers b. lots of water
32 2 3 Oxygen and Carbon Dioxide cause the following
condition in a boiler:
a. scale
b. carryover
c. sludge
d. corrosion Correct Answers d. corrosion
32 2 3 The process of passing the water through a steam flow in
a deaerator is known as:
a. scrubbing
b. scouring
c. sweeping
d. washing Correct Answers a. scrubbing
4 2 2 4 Total alkalinity is usually measured using the:
a. T-alkalinity test
b. M-alkalinity test
,c. P-alkalinity test
d. O-alkalinity test Correct Answers b. M-alkalinity test
A boiler has an M-alkalinity that is greater than the prescribed
control range. What is the appropriate operator response?
a. Increase the rate of sodium hydroxide feed.
b. Increase the rate of continuous blowdown.
c. Lower the boiler water level.
d. Reduce the frequency of bottom blowoff. Correct Answers b.
Increase the rate of continuous blowdown.
A common metal used for sacrificial anodes is:
a. zinc
b. silver
c. copper
d. lead Correct Answers a. zinc
A conductivity meter is used to measure the:
a. Alkalinity
b. Electrolyte
c. Hardness
d. Total Dissolved Solids Correct Answers d. Total Dissolved
Solids
A conductivity meter measures:
a. total alkalinity
b. hydroxide alkalinity (caustic alkalinity)
,c. total dissolved solids
d. total suspended matter Correct Answers c. total dissolved
solids
A continuous blow-off is
a. used on every boiler
b. used to reduce sludge
c. used to reduce the dissolved gases in the boiler
d. installed in the steam drum
e. installed in the lower drum Correct Answers d. installed in
the steam drum
A disadvantage of using glycol in heating or cooling systems
instead of water is that
a. all glycols are toxic
b. glycol has lower viscosity, so that fluid velocities increase.
c. glycol has a higher specific heat, so the systems run hotter
d. more powerful pumps are required Correct Answers d. more
powerful pumps are required
A disadvantage of using sodium sulphite in a boiler to remove
dissolved oxygen is that:
a. it produces corrosion
b. it increases the total dissolved solids in the boiler
c. it may increase caustic corrosion
d. it decreases the effect of the deaerator
e. it does not prevent scale build up Correct Answers b. it
increases the total dissolved solids in the boiler
, A filter should be backwashed in order to:
a. regenerate the filter
b. dissolve the suspended matter
c. transfer liquid in the opposite direction
d. flush the trapped impurities to waste
e. oxidize the water Correct Answers d. flush the trapped
impurities to waste
A low cost way to remove suspended solids, normally associated
with ground water, is by use of a:
a. settling pond
b. reverse osmosis system
c. demineralizer
d. hot lime soda softener Correct Answers a. settling pond
A measure of the cloudiness of the water is known as:
a. clarity
b. turbidity
c. neutrality
d. visibility Correct Answers b. turbidity
A method of treatment, which is often used in conjunction with
settling tanks, is:
a. deaeration
b. zeolite softening
c. demineralizing
