Ref. elements part 1

1. Which of the following could be used to check a leak in an ammonia system?

• Litmus Paper

• Halide Torch

• Sulfur stick

• A and C

2. Ammonia leaks in the condenser can be detected by:

• smelling the discharge water

• applying litmus paper to the circulating water discharge

• adding oil of peppermint to the system and tracing and looking for bubbles

• applying a soapy solution to the condenser heads and looking for bubbles

A sulfur stick burning in the presence of ammonia will give off a _______.

• dense yellow smoke

• dense yellow smoke

• dense white smoke

• dense green smoke

An ammonia leak will turn litmus paper __________.

• blue

• green

• red

• yellow

5. In an ammonia system the oil gauge must be kept:

• closed except when checking oil level

• open at all times

• close when machine is shut down

• open when machine is shut down

6. Valves and piping in an ammonia system are made of:

• brass

• bronze

• iron

• copper

The relief valve on an ammonia machine is located :

• on the discharge pipe from the condenser

• on the discharge pipe from the compressor

• in the compressor head

• A nad B

8. When purging an ammonia condenser into a bucket of water, one can tell when the air is out and ammonia starts to come through by the

• smell of the ammonia being liberated from the water

• color of the water turning green

• color of the water turning bluish

• change of bubbling sound of air to the crackling sound of ammonia

The crossover connection in an ammonia system can be used to ______.

• hot-gas defrost

• pump air out of the system

• add refrigerant to the system

• reduce the pressure on the discharge side of the condenser

How is an ammonia system purged so that operator will not be overcome by the fumes?

• into a bucket of lube oil

• back into the compressor

• into a bucket of water

• into the atmospheric line