©THEBRIGHT EXAM SOLUTIONS
10/30/2024 11:32 PM
Power Engineering 4th Class - B6 Exam
Questions And Answers 100% Pass
The principal cause of steel corrosion in cooling towers is:
a. Low pH
b. Dissolved oxygen
c. High pH
d. Dissolved carbon dioxide - answer✔b
In a steam plant, condensate treatment is necessary
a. to provide clean, potable drinking water.
b. to provide ultra-pure boiler feedwater.
c. to aerate the condensate before it enters the deaerator.
d. because condensate can contain impurities harmful to boilers and condensate return
systems. - answer✔d
Temporary hardness in feedwater is caused by:
a. Magnesium sulphate
b. Calcium carbonate
c. Magnesium bicarbonate
d. Sodium nitrate - answer✔c
, ©THEBRIGHT EXAM SOLUTIONS
10/30/2024 11:32 PM
Sludge is usually removed from a boiler by:
a. Blowing down through the continuous blowdown
b. Blowing off through the bottom blowoff connection
c. Vacuuming it from the bottom
d. Filtering the water before it leaves the boiler - answer✔b
Which of the following is a desiccant used for dry layup?
a. Silicone Gel
b. Lime soda
c. Quick lime
d. Soda ash - answer✔c
Filming amines protect against the harmful effects of:
a. suspended solids and corrosion products.
b. dissolvedcalcium and magnesium salts.
c. high condensate pH.
d. dissolved carbon dioxide and oxygen. - answer✔d
The main scale forming substance in cooling water towers is:
a. Calcium bicarbonate
b. Sodium phosphate
c. Sodium sulfite
d. Magnesium carbonate - answer✔a
, ©THEBRIGHT EXAM SOLUTIONS
10/30/2024 11:32 PM
A boiler has an M-alkalinity that is greater than the prescribed control range. What is the
appropriate operator response?
a. Reduce the frequency of bottom blowoff.
b. Lower the boiler water level.
c. Increase the rate of continuous blowdown.
d. Increase the rate of sodium hydroxide feed. - answer✔c
Dissolved gases, such as oxygen and carbon dioxide, can be removed by a process known as:
a. Clarification
b. Scrubbing
c. Sedimentation
d. Deaeration - answer✔d
Which of these processes removes suspended matter from plugged filter beds?
a. Backwashing
b. Rinsing
c. Flushing
d. Regeneration - answer✔a
Sludge conditioning in a boiler:
a. Is done to mix the sludge with the boiler water
b. Prevents precipitates from adhering to boiler surfaces
c. Prevents pollution from the blowdown water
d. Is controlled by the continuous blowdown - answer✔b
10/30/2024 11:32 PM
Power Engineering 4th Class - B6 Exam
Questions And Answers 100% Pass
The principal cause of steel corrosion in cooling towers is:
a. Low pH
b. Dissolved oxygen
c. High pH
d. Dissolved carbon dioxide - answer✔b
In a steam plant, condensate treatment is necessary
a. to provide clean, potable drinking water.
b. to provide ultra-pure boiler feedwater.
c. to aerate the condensate before it enters the deaerator.
d. because condensate can contain impurities harmful to boilers and condensate return
systems. - answer✔d
Temporary hardness in feedwater is caused by:
a. Magnesium sulphate
b. Calcium carbonate
c. Magnesium bicarbonate
d. Sodium nitrate - answer✔c
, ©THEBRIGHT EXAM SOLUTIONS
10/30/2024 11:32 PM
Sludge is usually removed from a boiler by:
a. Blowing down through the continuous blowdown
b. Blowing off through the bottom blowoff connection
c. Vacuuming it from the bottom
d. Filtering the water before it leaves the boiler - answer✔b
Which of the following is a desiccant used for dry layup?
a. Silicone Gel
b. Lime soda
c. Quick lime
d. Soda ash - answer✔c
Filming amines protect against the harmful effects of:
a. suspended solids and corrosion products.
b. dissolvedcalcium and magnesium salts.
c. high condensate pH.
d. dissolved carbon dioxide and oxygen. - answer✔d
The main scale forming substance in cooling water towers is:
a. Calcium bicarbonate
b. Sodium phosphate
c. Sodium sulfite
d. Magnesium carbonate - answer✔a
, ©THEBRIGHT EXAM SOLUTIONS
10/30/2024 11:32 PM
A boiler has an M-alkalinity that is greater than the prescribed control range. What is the
appropriate operator response?
a. Reduce the frequency of bottom blowoff.
b. Lower the boiler water level.
c. Increase the rate of continuous blowdown.
d. Increase the rate of sodium hydroxide feed. - answer✔c
Dissolved gases, such as oxygen and carbon dioxide, can be removed by a process known as:
a. Clarification
b. Scrubbing
c. Sedimentation
d. Deaeration - answer✔d
Which of these processes removes suspended matter from plugged filter beds?
a. Backwashing
b. Rinsing
c. Flushing
d. Regeneration - answer✔a
Sludge conditioning in a boiler:
a. Is done to mix the sludge with the boiler water
b. Prevents precipitates from adhering to boiler surfaces
c. Prevents pollution from the blowdown water
d. Is controlled by the continuous blowdown - answer✔b
