FE in ME303P2

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

• A. Litmus paper
• B. Halide torch
• C. Sulfur stick
• A and C

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

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

Valves and piping in an ammonia system are made of:

• brass
• bronze
• iron
• copper

The relief valve on an ammonia machine is located:

• A. on the discharge pipe from the condenser
• B. on the discharge pipe from the compressor
• C. in the compressor head
• A and B

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