The Other Skilled Trades is a professional certification assessment in us. Thorough preparation is essential to demonstrate your knowledge and competency in this field.
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Try these questions from our free Other Skilled Trades practice tests. The correct answer and an explanation follow each question.
What refrigerant replaced R-22 (Freon) as the standard for residential air conditioning in the US?
Answer: B. R-410A
R-410A replaced R-22 as the standard residential AC refrigerant in the US after R-22 was phased out due to its ozone-depleting properties under the Montreal Protocol.
What is the minimum required header size over a 4-foot door opening in a load-bearing wall?
Answer: C. (2) 2x8
A 4-foot opening in a load-bearing wall typically requires a double 2x8 header to safely carry the loads above the opening.
What does a TXV (thermostatic expansion valve) do in a refrigeration system?
Answer: B. Regulates the flow of refrigerant into the evaporator based on superheat
A TXV meters refrigerant flow into the evaporator coil, automatically adjusting to maintain a set superheat level and ensure the coil is fully utilized without liquid refrigerant reaching the compressor.
What shielding gas is most commonly used for MIG welding mild steel in the US?
Answer: C. 75% Argon / 25% CO2
A 75/25 Argon/CO2 mixture (C25) is the most widely used shielding gas for MIG welding mild steel, providing good arc stability and weld appearance.