Quiz 4

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? a. Place a rubber mat on the floor. b. Use a wooden ladder. c. Wear insulated boots and gloves. d. All of the above.

d. All of the above

Which of the following statements is correct when referring to large refrigerant or nitrogen tanks? a. The protective cap must be on when the tank is not in use. b. Safety goggles or glasses must be worn when moving the tank. c. Large tanks should not be carried, they should be secured to an approved cart. d. All of the above are correct.

d. All of the above are correct.

Fires that involve ordinary materials such burning metal is classified a Class _____ fires. a. A b. B c. C d. D

d. D

Fires that involve ordinary materials such as paper, cardboard, and wood are classified as Class____ fires. a. A b. B c. C d. D

a. A

When transferring refrigerants form a cylinder to a refrigeration system or any other container, you should always wear. a. goggles with side shield and gloves b. heavy protective clothing c. rubber gloves d. industrial steel-toed shoes and an insulated cap

a. goggles with side shield and gloves

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 b. a metal alloy

a. material with a low melting point.

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? a. 255.7 psig b. 259.9 psig c. 267.0 psig d. 271.5 psig

b. 259.9 psig

A double insulated drill___. a. has two ground wires to insure proper grounding b. generally has a plastic case with the electrical connections and motor insulated within the tool. c. is used with three- to two-prong adapter

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

Fires that involve ordinary materials such as oil and gas are classified as Class _____ fires. a. A b. B c. C d. D

b.B

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? a. 202.64 b. 226.61 c. 194.92 d. 145.71

c. 194.92

This class involves energized electrical equipment. Class _____ fire extinguishers usually use a dry power to smother the fire. a. A b. B c. C d. D

c. C

Before using a voltmeter, always____. a. Zero the ohms adjustment b. Touch the two leads together to insure continuity. c. Set the range selector selector to a setting higher than the voltage you expect to read. d. Turn off the power.

c. Set the range selector selector to a setting higher than the voltage you expect to read.

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

c. a cylinder containing refrigerant

In electrical circuits, the grounding wire is typically _____. a. black b. red c. green or bare d. white

c. green or bare

When using a torch to braze a fitting, the technician should use the proper size ___, wear ___ and always have a ___ nearby. a. copper pope, insulated boots, fire extinguisher. b. torch tip, insulated boots, protective fire shield c. torch tip, safety glasses, fire extinguisher d. acetylene tank, safety glasses, bucket of water.

c. torch tip, safety glasses, fire extinguisher