Blowers MCQs : This section focuses on the "Blowers" in Waste Water Engineering. These Multiple Choice Questions (MCQs) should be practiced to improve the Waste Water Engineering skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.
Question 1
Proper aeration and blower selection are two of the most important considerations at a wastewater plant.
A. TRUE
B. FALSE
C. Can be true or false
D. Can not say
View Answer
Ans : A
Explanation: Yes, Proper aeration and blower selection are two of the most important considerations at a wastewater plant.
Question 2
From which we can identify the actual operating air flow?
A. flow rate
B. back pressure
C. Both A and B
D. None of the above
View Answer
Ans : C
Explanation: Blowers create air flow (flow rate). The total blower system creates pressure (back pressure) through resistance to air flow. By combining the flow rate and back pressure, you can identify the actual operating air flow.
Question 3
The purpose of the blower is ?
A. create additional air flow
B. provide the correct air flow at any time
C. enhanced aeration efficiency
D. All of the above
View Answer
Ans : D
Explanation: While the purpose of the blower is to create additional air flow, the purpose of blower controls is to provide the correct air flow at any time, which in turn provides enhanced aeration efficiency.
Question 4
Aeration energy consumes _______ of all electrical usage.
A. 0.5
B. 0.6
C. 0.7
D. 0.8
View Answer
Ans : B
Explanation: Aeration energy consumes 60% of all the electrical usage.
Question 5
Which of the following is created by blowers?
A. Water flow
B. Wastewater flow
C. Air flow
D. Vacuum flow
View Answer
Ans : C
Explanation: Blowers create air low. The blower system creates pressure through resistance to air flow. By combining the flow rate and back pressure, the actual operating air flow can be identified.
Question 6
What is the purpose of the blower?
A. Decrease air flow
B. Increase air flow
C. Create vacuum
D. Maintain air flow
View Answer
Ans : B
Explanation: The purpose of the blower is to increase the air flow or create additional air flow, the purpose of blower controls is to provide the correct air flow at any time, which in time provides the enhanced aeration efficiency.
Question 7
Air is used to ________ the filter bed.
A. Compact
B. Aerate
C. Fluidize
D. Expand
View Answer
Ans : D
Explanation: Air is used to expand the filter bed, breaking up compacted material. When the clean water is pumped in for backwash, it suspends and loosens the material and the particles are lifted through and carried away.
Question 8
Which technology’s principle is used in screw blowers?
A. Air compressor
B. Air expander
C. Ventilators
D. Vacuum creators
View Answer
Ans : A
Explanation: The technology employed with the screw blowers is essentially a scaled version of the principles used in an air compressor. The rotors trap and then squeeze air between them. Air is progressively compressed during each rotation.
Question 9
Which of these is not a characteristic of variable speed drive?
A. Improved speed control of the blower
B. Speed adjustments over a continuous range
C. Can be retrofitted into an existing motor
D. High cost
View Answer
Ans : C
Explanation: Variable speed drives cannot be retrofitted into an existing motor. Variable frequency drive can be retrofitted into an existing motor. Variable frequency drives are less expensive than variable speed drives.
Question 10
The essential function of an aeration control system is to fulfill oxygen demands and maintain the treatment process at the lowest possible costs.
A. TRUE
B. FALSE
C. Can be true or false
D. Can not say
View Answer
Ans : A
Explanation: True, The essential function of an aeration control system is to fulfill oxygen demands and maintain the treatment process at the lowest possible costs.