Unit 4 Review Question/ General Safety Practice

A Class A fire extinguisher is to be used on which type of fire?

Paper

Which of the following refrigerant safety groups has the highest flammability and the highest toxicity?

B3

Which of the following statements is true regarding working on electrical circuits?

Be sure to use proper lock-out and tag-out procedures on all equipment.

Which of the following represents three pieces of personal protection equipment (PPE)?

Hard hats, ear plugs, work boots

Which organ is most likely to be affected by electric shock?

Heart

Which of the following statements is true regarding the use of nitrogen?

The nitrogen tank must be outfitted with a pressure regulator.

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

The tank can become airborne

What can be done to prevent damaging the surroundings while soldering or brazing?

Use a heat shield

Which of the following is the safest acceptable method for moving a piece of heavy equipment across a smooth, flat roof?

Using pipe rollers

To prevent injury from leaking refrigerants, chemical vapors, or torch fumes, it is good field practice to

ensure adequate ventilation.

All of the following are true regarding first aid except

first aid is intended to be administered only by trained professionals.

The ground wire on most systems is commonly color-coded

green.

A confined space can be defined as an area or place that

is not intended for human occupancy.

When lifting a heavy object by yourself, make certain that you

lift with your legs.

If an extension ladder is used to access the roof of a 10-foot high building, the base of the ladder should be approximately how many feet from the building?

2.5 feet

How far above the landing surface should an extension ladder extend?

3 feet

If a compressor motor experiences a burnout, which of the following can be produced?

Acid

When working around rotating machinery, which of the following is true?

Allow all rotating equipment to come to a complete stop before servicing.

What can happen when oil is mixed with oxygen under pressure?

An explosion can occur

Which of the following tasks could potentially subject a service technician to frostbite?

Connecting or removing a service hose from a liquid-line service port

Which of the following factors will most directly deter-mine the severity of an electric shock?

Current flow through the victim

With respect to fire extinguishers, the acronym PASS stands for

Pull, Aim, Squeeze, Sweep

What should be done before using chemicals to clean a dirty evaporator coil?

Read the label on the chemical container

When electric current flows through the body, which of the following injuries will commonly result?

Shocks and burns

To help remain safe on the job, it is always recommended that field personnel

be aware of all potential hazards around them.