ACR-101 Unit 4 Homework 1 (CRF)

Which of the following can happen to a full nitrogen cylinder when the top is broken off?

• Nitrogen will slowly leak out.

• There will be a loud bang.

• The tank will act like a rocket and move very fast.

• It will make a sound like a washing machine.

Extension ladders used to gain access to roof-top locations should extend ____ feet above the roof.

• 3

• 5

• 6

• 4

The OSHA-approved tanks used to recover refrigerant are color-coded with a gray body and a yellow top.

• True

• False

ASHRAE Standard 34 uses the letters "A" and "B" to indicate refrigerant toxicity and numbers 1, 2, and 3 to indicate its _______.

• ability to fractionate

• flammability

• refrigerant class

• acidity

There are two subclasses of ASHRAE Standard 34, A2L and B2L. The capital "L" is used to indicate _______.

• lower toxicity

• lower flammability

• lower fractionation potential

• latent heat of vaporization

Refrigerant and oil in a system that has had a compressor motor burn out can be hazardous because they may contain acid.

• True

• False

Refrigerant vapors that have passed through an open flame or that have been heated during the brazing or soldering process will _______.

• no longer condense to a liquid

• not breakdown and can be reused

• become very hygroscopic

• have a strong odor and become toxic and harmful

When brazing near wood, a _______ can be used to reduce the flammability of the wood.

• nitrogen purge

• smoke alarm

• fire extinguisher

• fire-resistant spray

Which of the following statements is correct when referring to buying refrigerant or nitrogen tanks?

• All are correct.

• Safety goggles or glasses must be worn when moving the tank.

• Large tanks should not be carried, they should be secured to an approved cart.

• The protective cap must be on when the tank is not in use.

A fusible plug is a metal fitting that has a hole drilled through it and the hole is filled with __________.

• a. a metal alloy that will burn when overheated

• b. copper fused with brass

• c. plastic

• d. material with a low melting point