Chapter 122

Question 1

Checking the condition of electrical starters and contactors is catagorised under which of the following maintenance schedules?

Answer 1

Annually

Question 2

Condenser high pressure trip are usually caused by inadequate?

Answer 2

condenser cooling

Question 3

To avoid slugging in a direct acting expansion evaporator what must be done?

Answer 3

pump down the evaporator

Question 4

If temperature drops 2.5-3 degrees celsius below the set point this safety device will shut down centrifugal compressors

Answer 4

chilled water low temperature cutout

Question 5

V-belt tension and alignment should be under maintenance?

Answer 5

monthly

Question 6

What are the causes of reduced air flow in turn creates an iced up evaporator?

Answer 6

Dirty air filters, broken fan belt, and improperly adjusted fan belt on evaporator

Question 7

What could be the issue when no flow of refrigerant is going through the expansion valve?

Answer 7

low compression suction pressure

Question 8

Excessive load could make the compression run_______.

Answer 8

continuously

Question 9

Before starting a centrifugal refrigeration compressor how long should the system be purged?

Answer 9

10 minutes

Question 10

When some refrigeration system are shut down for a prolonged period of time where should the refrigerant be stored?

Answer 10

in the receiver tank

Question 11

A centrifugal refrigeration compressor motor demand limiter, limits current flow to the?

Answer 11

motor