1
"C" Water Operator - 600 Study
Questions with 100% Correct Answers
What is an Ampere? Correct Answer: a unit of measurement for current
Which of the following is a type of pump that is commonly used in a water
treatment plant? Correct Answer: Centrifugal
What is a multi-staged pump? Correct Answer: has more than one impeller
if the pump impeller is running backwards, what action must be taken to correct
the rotation? Correct Answer: switch any two electrical leads
When should the packing of a pump be adjusted? Correct Answer: when the
pump is running
when a pump fails to deliver at its rated capacity, what is most likely the cause?
Correct Answer: air leak
what is a common cause for vibrations in a motor? Correct Answer:
misalignment of the couplings
What is the purpose of the wear rings in a pump? Correct Answer: Plug internal
leakage
what should the seal water pressure be for a pump? Correct Answer: 5 psi
higher than the pumps discharge pressure
what is the purpose of the seal water? Correct Answer: block out air intake and
lubricate the packing
:
vPretest - Stuvia US
,2
what is the recommended maximum suction lift? Correct Answer: 15 ft.
In a water treatment plant, what type of pump is commonly used to deliver
chemical solutions? Correct Answer: Positive displacement
when should you lubricate your equipment? Correct Answer: follow the
manufacturer's recommendations
In what manner is packing installed? Correct Answer: a strip at a time and
staggered
a positive displacement pump should never be operated________? Correct
Answer: against a closed discharge valve
if two of more pumps of the same size and purpose are online, what method of
operation is recommended for them? Correct Answer: alternate to equalize
wear
If half of the mechanical seal fails, what corrective action should be taken?
Correct Answer: change both halves of the seal
what is the purpose of a lantern ring? Correct Answer: water seal
The packing of a pump should be adjusted to _________? Correct Answer: allow
a slight operating leakage and allow approximately a drip per second.
On a multiple drive motor, when a belt fails, what corrective action should be
taken? Correct Answer: Replace all the belts on the drive
To keep a centrifugal pump primed, install a _______ valve at the end of the
suction line. Correct Answer: foot valve
:
vPretest - Stuvia US
,3
If a motor fails to start, what should be checked first? Correct Answer: Power
supply
Opening or closing a valve rapidly will cause? Correct Answer: water hammer
The formation and collapse of a gas pocket or bubble on the blade of an
impeller is called? Correct Answer: cavitaion
Changing the packing on a pump is called ________ maintenance Correct
Answer: corrective
what is an example of a daily maintenance task for a compressor? Correct
Answer: drain the air receiver
what type of valve is usually used to control the rate of flow? Correct Answer:
globe valve
what type of valve is buried? Correct Answer: non-rising stem
what is the most common valve type used in a water treatment plant? Correct
Answer: gate valve
what will happen if the gate valve is left half open to control flow? Correct
Answer: Undue seat wear
In what manner should carbon be stored? Correct Answer: on concrete floor in
single rows
what is brinelling? Correct Answer: a type of bearing wear
:
vPretest - Stuvia US
, 4
what is the recommended manner for storing potassium permanganate?
Correct Answer: on a concrete floor away from heat or heated pipes
what causes more damage to a pump's impeller? Correct Answer: Air
What is the unit of electrical resistance? Correct Answer: Ohm
What is an ammeter Correct Answer: measures amps and current
what type of electrical service is usually found in water plants? Correct Answer:
three phase
Generally, all motors over over two HP require what type of electrical service?
Correct Answer: 3 phase
Before starting work on any electrical equipment, you must first ____? Correct
Answer: Lock out tag out
What unit is used to measure the rate of power Consumption? Correct Answer:
Kilowatts
What is the function of a shear pin? Correct Answer: to prevent damage to
equipment when there is an overload
The measurement of how close an instrument determines the true of actual
reading of an instrument is called? Correct Answer: Accuracy
The readout of an instrument by the use of a pointer against a scale is an _____
reading? Correct Answer: analog
:
vPretest - Stuvia US
"C" Water Operator - 600 Study
Questions with 100% Correct Answers
What is an Ampere? Correct Answer: a unit of measurement for current
Which of the following is a type of pump that is commonly used in a water
treatment plant? Correct Answer: Centrifugal
What is a multi-staged pump? Correct Answer: has more than one impeller
if the pump impeller is running backwards, what action must be taken to correct
the rotation? Correct Answer: switch any two electrical leads
When should the packing of a pump be adjusted? Correct Answer: when the
pump is running
when a pump fails to deliver at its rated capacity, what is most likely the cause?
Correct Answer: air leak
what is a common cause for vibrations in a motor? Correct Answer:
misalignment of the couplings
What is the purpose of the wear rings in a pump? Correct Answer: Plug internal
leakage
what should the seal water pressure be for a pump? Correct Answer: 5 psi
higher than the pumps discharge pressure
what is the purpose of the seal water? Correct Answer: block out air intake and
lubricate the packing
:
vPretest - Stuvia US
,2
what is the recommended maximum suction lift? Correct Answer: 15 ft.
In a water treatment plant, what type of pump is commonly used to deliver
chemical solutions? Correct Answer: Positive displacement
when should you lubricate your equipment? Correct Answer: follow the
manufacturer's recommendations
In what manner is packing installed? Correct Answer: a strip at a time and
staggered
a positive displacement pump should never be operated________? Correct
Answer: against a closed discharge valve
if two of more pumps of the same size and purpose are online, what method of
operation is recommended for them? Correct Answer: alternate to equalize
wear
If half of the mechanical seal fails, what corrective action should be taken?
Correct Answer: change both halves of the seal
what is the purpose of a lantern ring? Correct Answer: water seal
The packing of a pump should be adjusted to _________? Correct Answer: allow
a slight operating leakage and allow approximately a drip per second.
On a multiple drive motor, when a belt fails, what corrective action should be
taken? Correct Answer: Replace all the belts on the drive
To keep a centrifugal pump primed, install a _______ valve at the end of the
suction line. Correct Answer: foot valve
:
vPretest - Stuvia US
,3
If a motor fails to start, what should be checked first? Correct Answer: Power
supply
Opening or closing a valve rapidly will cause? Correct Answer: water hammer
The formation and collapse of a gas pocket or bubble on the blade of an
impeller is called? Correct Answer: cavitaion
Changing the packing on a pump is called ________ maintenance Correct
Answer: corrective
what is an example of a daily maintenance task for a compressor? Correct
Answer: drain the air receiver
what type of valve is usually used to control the rate of flow? Correct Answer:
globe valve
what type of valve is buried? Correct Answer: non-rising stem
what is the most common valve type used in a water treatment plant? Correct
Answer: gate valve
what will happen if the gate valve is left half open to control flow? Correct
Answer: Undue seat wear
In what manner should carbon be stored? Correct Answer: on concrete floor in
single rows
what is brinelling? Correct Answer: a type of bearing wear
:
vPretest - Stuvia US
, 4
what is the recommended manner for storing potassium permanganate?
Correct Answer: on a concrete floor away from heat or heated pipes
what causes more damage to a pump's impeller? Correct Answer: Air
What is the unit of electrical resistance? Correct Answer: Ohm
What is an ammeter Correct Answer: measures amps and current
what type of electrical service is usually found in water plants? Correct Answer:
three phase
Generally, all motors over over two HP require what type of electrical service?
Correct Answer: 3 phase
Before starting work on any electrical equipment, you must first ____? Correct
Answer: Lock out tag out
What unit is used to measure the rate of power Consumption? Correct Answer:
Kilowatts
What is the function of a shear pin? Correct Answer: to prevent damage to
equipment when there is an overload
The measurement of how close an instrument determines the true of actual
reading of an instrument is called? Correct Answer: Accuracy
The readout of an instrument by the use of a pointer against a scale is an _____
reading? Correct Answer: analog
:
vPretest - Stuvia US
