Unit 4

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

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

• 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.

• All of the above are correct.

An example of a pressure vessel is ____.

a. a small ship containing refrigerant cylinders

b. the compressor in a refrigeration unit

c. a cylinder containing refrigerant

d. a portable dolly

• a small ship containing refrigerant cylinders

• the compressor in a refrigeration unit

• a cylinder containing refrigerant

• a portable dolly

An R-22 cylinder containing enough refrigerant to have liquid refrigerant in it, is in a truck with a temperature of 120°F. What would be the psig pressure in the cylinder? USE P/T Chart.

• 255.7 psig

• 259.9 psig

• 267.0 psig

• 271.5 psig

A cylinder with 1,500 sq. in. of internal surface contains R-22 and is in a service truck body at 120°F. What is the total outward force of the refrigerant against the inner wall of the cylinder in tons of pressure?

• 202.64

• 226.61

• 194.92

• 145.71

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

a. material with a low melting point

b. plastic

c. copper fused with brass

d. a metal alloy that will burn when overheated

• material with a low melting point

• plastic

• copper fused with brass

• a metal alloy that will burn when overheated

When transferring refrigerants from a cylinder to a refrigeration system or any other container, you should always wear ____.

• goggles with side shields and gloves

• heavy protective clothing

• rubber gloves

• industrial steel-toed shoes and an insulated cap

When it is necessary to perform electrical work in an area that has a damp or wet floor, which of the following can be done to minimize the chance of electrical shock?

• Place a rubber mat on the floor.

• Use a wooden ladder.

• Wear insulated boots and gloves.

• All of the above

Electrical power should always be shut off at the _____ or entrance panel and locked out in an approved manner when installing equipment.

• equipment

• local

• distribution

• remote

A double insulated drill ____.

• has two ground wires to insure proper grounding

• generally has a plastic case with the electrical connections and motor insulated within the tool

• is used with a three- to two-prong adapter

• has rechargeable batteries

In electrical circuits, the _____ wire protects the operator.

• live

• control

• grounding

• neutral