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

• Nitrogen must only be added to fully charged HVACR systems.
• The nitrogen tank must be outfitted with a pressure regulator.
• Nitrogen must only be added to systems that are in a deep vacuum.
• Dry nitrogen is a volatile gas that follows a pressure/temperature relationship.

The nitrogen tank must be outfitted with a pressure regulator.

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

• The mixture will solidify
• Methane gas will form
• An explosion can occur
• The ability of the oil to lubricate will increase

An explosion can occur

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

• Lungs
• Liver
• Kidneys
• Heart

Heart

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

• Burns and death
• Death and hearing loss
• Hearing loss and burns
• Shocks and burns

Shocks and burns

Which of the following factors will most directly determine the severity of an electric shock?

• The weight of the individual
• Voltage that the individual is subjected to
• Current flow through the individual
• The height of the individual

Current flow through the individual

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

• Ensure that the circuit power is on whenever working on electric circuits.
• Be sure to use proper lock-out and tag-out procedures on all equipment.
• Using aluminum ladders will protect individuals from electricity-related injuries.
• Metallic jewelry reduces the possibility of receiving an electric shock.

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

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

• Use a lower-temperature torch
• Apply extra flux to the joints
• Use a heat shield
• Properly clean all fittings

Use a heat shield

The ground wire on most systems is commonly color-coded

• black.
• white.
• green.
• red.

Green

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

• Chemical
• Paper
• Grease
• Electrical

Paper

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

• A1
• B3
• B1
• A3

B3

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

• lift with your back.
• avoid wearing gloves.
• lift with your legs.
• avoid wearing a back brace.

Lift with your legs.

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

• Pulling it
• Carrying it by hand
• Dragging it
• Using pipe rollers

Using pipe rollers

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

• Smell the chemical to see if it burns
• Spray a small amount of the chemical on your skin
• Read the label on the chemical container
• Turn off all exhaust and ventilation fans

Read the label on the chemical container

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

• Grease
• Oil
• Water
• Acid

Acid

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

• 6 feet
• 3 feet
• 1/2 of the ladder’s working length
• 1/4 of the ladder’s working length

3 feet

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
• 5 feet
• 10 feet
• 7.5 feet

2.5 feet

With respect to fire extinguishers, the acronym PASS stands for

• Push, Adjust, Sweep, Squeeze
• Pull, Aim, Sweep, Squeeze
• Pull, Aim, Squeeze, Sweep
• Push, Aim, Squeeze, Sweep

Pull, Aim, Squeeze, Sweep

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

• Be sure to remove all protective shields while the equipment is operating.
• Allow all rotating equipment to come to a complete stop before servicing.
• Avoid wearing tight-fitting clothing when working on rotating equipment.
• It is safe to stop rotating equipment with your hand if the power is off.

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

All of the following are true regarding first aid except

• first aid is intended to help relieve pain.
• first aid is intended to help promote recovery.
• first aid is intended to be administered only by trained professionals.
• first aid is intended to help prevent injuries from getting worse.

First aid is intended to be administered only by trained professionals

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

• has an interior volume that is less than 1000 cubic feet.
• is intended to accommodate no more than three people.
• is enclosed on all sides with no access openings.
• is not intended for human occupancy.

Is not intended for human occupancy

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

• only use chemicals with low toxicities.
• wear a dust mask whenever possible.
• ensure adequate ventilation.
• only work outdoors.

Ensure adequate ventilation