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Question 1
What are common safety color codes in shop environments?
Correct Answer:
Red for fire equipment, yellow for caution, blue for information, green for safety
Explanation:
Colors in a shop are used to convey safety messages quickly so people know how to respond. Red is reserved for emergency-related items and actions tied to fire safety, like fire extinguishers, alarms, and emergency stops. Yellow signals caution, highlighting areas or situations where extra care is needed, such as wet floors, pinch points, or exposed moving machinery. Blue is used for information or guidance that tells you what to do, such as safety procedures or advisory notices. Green marks safe conditions or routes, including exits, first aid stations, and locations where safety equipment is ready to use. This combination helps workers react fast and consistently, even when under pressure.
Question 2
In electrical schematics, which symbol best represents a resistor?
Correct Answer:
Long squiggly line
Explanation:
The symbol for a resistor is a long squiggly line because this jagged line has been the traditional, quickly recognizable representation of resistance in many schematic conventions, especially in common classroom and US-based diagrams. It stands out clearly from other components, so you can scan a circuit and immediately spot where resistance is placed. While some standards use a rectangle for a resistor, that variant isn’t the symbol used in this context, and the other shapes shown don’t match how resistors are typically drawn. So the long squiggly line is the best choice because it aligns with the common depiction of a resistor in everyday schematics.
Question 3
Which gas is not among the three hydrocarbons listed?
Correct Answer:
Ethane
Explanation:
The item asks you to identify which hydrocarbon isn’t part of the three named. The three hydrocarbons listed are methane, propane, and butane. Ethane isn’t in that set. It’s the two-carbon member of the same family (C2H6), whereas the others are C1, C3, and C4. So ethane is the gas not among the three listed.
Question 4
When do you need to add an additional circuit vent?
Correct Answer:
On 45 degree change
Explanation:
Air pockets tend to form when flow is redirected in a pipe, especially at tilted bends. Adding an extra vent at a 45-degree change lets trapped air escape, preventing air locks that can disrupt flow and pressure. That’s why this option is the best choice. A 90-degree elbow isn’t the default vent point in this rule, and a fixed distance like 50 feet doesn’t account for how bends and direction changes affect air buildup. Vents aren’t limited to oil burners; the need for venting depends on the system’s tendency to trap air, not the fuel type.
Question 5
During the refrigerant cycle in a split system, which phase change occurs as the refrigerant absorbs heat?
Correct Answer:
Evaporation
Explanation:
In the evaporator, heat is absorbed from the surroundings, and the liquid refrigerant changes to a gas. This phase change from liquid to vapor is evaporation, driven by the heat input at low pressure. The evaporator’s job is precisely to remove heat by allowing this latent heat of vaporization to be absorbed, producing the cooling effect. Condensation would occur when gas loses heat and becomes liquid in the condenser, compression increases pressure without a phase change, and expansion throttles the refrigerant lowering pressure and temperature but doesn’t involve heat absorption to change phase. So the phase change during heat absorption is evaporation.
Question 1
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About this Exam

Prepare with the Trades Qualification (TQ) Practice 3rd Year Practice Test practice quiz. This question bank includes 10 questions covering inch, circuit, refrigerant, trap, and trades. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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Trades Qualification (TQ) Practice 3rd Year Practice Test

This practice set contains 10 questions from the matching question bank and focuses on inch, circuit, refrigerant, trap, and trades. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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