WTO Pumps and Motors 2

Question 1

What is the primary purpose of a pump impeller in a centrifugal pump?

Accepted Answer

To convert mechanical energy into fluid velocity

Answer

To seal the pump casing

Answer

To regulate discharge pressure

Answer

To prime the pump automatically

Question 2

A pump is experiencing cavitation. Which operational change would most likely resolve this issue?

Accepted Answer

Reduce the suction lift or increase suction head

Answer

Increase the discharge pressure

Answer

Increase the motor speed

Answer

Close the discharge valve partially

Question 3

What does NPSH stand for in pump terminology?

Accepted Answer

Net Positive Suction Head

Answer

Normal Pump Speed Head

Answer

Net Pressure Surge Head

Answer

Nominal Pump Suction Height

Question 4

A three-phase motor is running on two phases only due to a blown fuse. What will most likely happen?

Accepted Answer

The motor will overheat and may burn out

Answer

The motor will run normally at reduced speed

Answer

The motor will automatically switch to single-phase mode

Answer

The motor will run faster than normal

Question 5

Which type of pump is best suited for high-flow, low-head water transmission applications at a water treatment plant?

Accepted Answer

Centrifugal pump

Answer

Reciprocating piston pump

Answer

Peristaltic pump

Answer

Gear pump

Question 6

What is the function of a mechanical seal in a centrifugal pump?

Accepted Answer

To prevent leakage along the pump shaft

Answer

To balance the impeller

Answer

To regulate pump speed

Answer

To protect the motor from overload

Question 7

When reading a pump curve, what does the intersection of the pump curve and system curve represent?

Accepted Answer

The actual operating point of the pump

Answer

The maximum flow capacity of the pump

Answer

The minimum operating efficiency

Answer

The shutoff head of the pump