AIT Trade Theory 4

Question 1

In HVAC theory, what is the refrigeration cycle process called when a refrigerant absorbs heat and changes from a liquid to a vapor?

Accepted Answer

Evaporation

Answer

Evaporation occurs in the evaporator coil where the low-pressure liquid refrigerant absorbs heat from the surrounding air or fluid, causing it to vaporize and cool the space.

Question 2

What is the purpose of a P-trap installed under a sink drain?

Accepted Answer

To hold water that acts as a seal against sewer gases entering the building

Answer

The curved P-trap holds a small amount of water that creates a water seal, preventing toxic and odorous sewer gases from traveling back up through the drain into the living space.

Question 3

What is the recommended practice when working near overhead power lines?

Accepted Answer

Maintain a minimum safe distance as required by safety regulations

Answer

Safety regulations require workers and equipment to maintain a minimum safe approach distance from overhead power lines, which varies based on line voltage and must be determined before work begins.

Question 4

In metalworking, what is the purpose of using a cutting fluid or coolant during machining operations?

Accepted Answer

To reduce friction and heat while improving surface finish and tool life

Answer

Cutting fluids reduce friction and heat generated during machining, which extends tool life, improves dimensional accuracy, removes chips from the cutting zone, and produces a better surface finish.

Question 5

What does the acronym WHMIS stand for in Canadian and North American workplace safety?

Accepted Answer

Workplace Hazardous Materials Information System

Answer

WHMIS stands for Workplace Hazardous Materials Information System, which is a Canada-wide system designed to provide employers and employees with important information about hazardous products used in the workplace.

(AIT) Apprenticeship and Industry Training Practice Test

(AIT) Apprenticeship and Industry Training Practice Test

AIT Trade Theory 4