Rotating Equipment (Pump) Quiz

What is the purpose of pump priming?

• To cool down the pump system

• To reduce the risk of pump damage during start-up

• To decrease the pump efficiency

• To increase the pump impeller speed

What is cavitation in a pump?

• Formation of air bubbles in the pump

• Loss of pump efficiency

• Overheating of the pump system

• Formation of small vapor-filled cavities due to rapid pressure changes

What is the purpose of a mechanical seal in a pump?

• To prevent leakage of fluid from the pump shaft

• To increase the pump impeller speed

• To cool down the pump system

• To reduce the pump efficiency

What is an air lock in a pump system?

• Formation of small vapor-filled cavities due to pressure changes

• Formation of air bubbles in the pump

• Restriction of liquid flow caused by trapped vapor in a high point of the system

• Loss of pump efficiency

When is priming not required for a pump?

• When the pump is dry

• When the pump is submerged or in a flooded suction condition

• When the pump is at a higher elevation than the supply

• When the pump is not in operation

What is hydraulic lock in a pump system?

• Formation of air bubbles in the pump

• Formation of small vapor-filled cavities due to rapid pressure changes

• Loss of pump efficiency

• A phenomenon that can occur on downward-pointing cylinders in piston engines

How can cavitation be prevented in a pump?

• By maintaining a constant flow rate in the pump

• By reducing the pump efficiency

• By ensuring rapid pressure changes do not occur in the liquid

• By increasing the pump impeller speed

What are the methods of pump priming?

• Automatically, with cooling tower, with recycle control valve, with vapor removal system

• Manually, with vacuum pump, with jet pump, with separator, installing foot valve

• By removing the pump impeller, by increasing the pump temperature, by reducing the pump flow rate, by adding more bearings

• By increasing the pump speed, by reducing the pump efficiency, by adding more seals, by changing the pump casing

What is the purpose of a foot valve in pump priming?

• To ensure priming of the pump by external arrangements

• To increase the pump impeller speed

• To cool down the pump system

• To reduce the pump efficiency

Why is priming necessary for roto dynamic pumps?

• To cool down the pump system

• To increase the pump impeller speed

• To reduce the pump efficiency

• To prevent the pump impeller from becoming gas-bound and incapable of pumping liquid