433A Pumps and Compressors 6

Question 1

What is the function of the anti-surge valve on a centrifugal compressor?

Accepted Answer

To maintain minimum flow through the compressor by recirculating gas, preventing the compressor from entering the unstable surge zone

Answer

To prevent motor overload

Answer

To reduce compressor noise

Answer

To control the discharge temperature

Question 2

What is a peristaltic (hose) pump and what is its primary advantage?

Accepted Answer

A pump that compresses a flexible tube with rollers to push fluid, ensuring zero contamination since fluid only contacts the tube

Answer

A pump that uses peristaltic motion in the motor

Answer

A high-pressure centrifugal pump

Answer

A pump used only in medical applications

Question 3

What is the correct procedure for packing a pump stuffing box?

Accepted Answer

Install individual pre-cut packing rings one at a time with joints staggered, seat each ring before adding the next, and position the lantern ring correctly

Answer

Wrap packing continuously around the shaft

Answer

Force all packing in at once and tighten the gland fully

Answer

Use any available material that fits

Question 4

What is the effect of running a compressor with a dirty inlet air filter?

Accepted Answer

Reduced inlet pressure causes higher compression ratio, increased discharge temperature, reduced capacity, and higher energy consumption

Answer

Improved air quality

Answer

No effect on performance

Answer

Increased compressor speed

Question 5

What is the purpose of a pump's baseplate drain?

Accepted Answer

To collect and safely contain any fluid that leaks from the pump seals or packing, preventing environmental contamination

Answer

To drain the pump casing

Answer

To drain the foundation

Answer

To reduce the weight of the baseplate

Question 6

Why is it important to follow the manufacturer's torque sequence when assembling a pump casing?

Accepted Answer

To ensure even clamping force, prevent gasket distortion, and avoid warping the casing that could cause misalignment or leaks

Answer

To make assembly faster

Answer

To match the paint markings

Answer

Torque sequence does not matter