What seperates the impeller from the volute and prevents backflow in a centrifugal
pump?
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wear rings
How often should the packing on a gate valve be replaced?
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, As required
A pump is delivering at a less than expected rate of discharge. What are the possible
causes?
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discharge head too low
When planning to work on or near electrical equipment, be sure to always:
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lock and tag out the equipment
A ground fault interrupter on an electrical circuit system is used to:
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disconnect power from the circuit if there is a faulty ground line
How often should inactive valves be exercised?
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, Quarterly to annually minimum
___ is the relationship in time between two waveforms of the same frequency.
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Phase
What type of in situ maintenance is recommended for most flexible membrane
diffusers?
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air bumping
Which of the following is a likely benefit of a planned maintenance program?
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Extended equipment life
Friction in a pipeline causes:
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pump?
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wear rings
How often should the packing on a gate valve be replaced?
Give this one a try later!
, As required
A pump is delivering at a less than expected rate of discharge. What are the possible
causes?
Give this one a try later!
discharge head too low
When planning to work on or near electrical equipment, be sure to always:
Give this one a try later!
lock and tag out the equipment
A ground fault interrupter on an electrical circuit system is used to:
Give this one a try later!
disconnect power from the circuit if there is a faulty ground line
How often should inactive valves be exercised?
Give this one a try later!
, Quarterly to annually minimum
___ is the relationship in time between two waveforms of the same frequency.
Give this one a try later!
Phase
What type of in situ maintenance is recommended for most flexible membrane
diffusers?
Give this one a try later!
air bumping
Which of the following is a likely benefit of a planned maintenance program?
Give this one a try later!
Extended equipment life
Friction in a pipeline causes:
Give this one a try later!
