The accompanying figure shows an assortment of mechanical symbols. What is the second symbol from the top?

A. Rectangular ceiling diffuser
B. Round supply duct turned down
C. Flexible connection
D. Transition


Answer: A

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Technician A says there will be a speed increase when an internal gear drives and is in mesh with an external gear. Technician B says the output gear will rotate in the opposite direction to the input gear when an external gear drives another external gear. Who is correct?

A. A only B. B only C. Both A and B D. Neither A nor B

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A(n) ____________________ filter has both a dry element and an oil foam cover. This cover serves as

a(n) ____________________.

Fill in the blank(s) with the appropriate word(s).

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CO2, ammonia, propane, butane, and isobutane are all natural refrigerants.

Answer the following statement true (T) or false (F)

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Why should a system be leak tested after it has been repaired before it is charged?

What will be an ideal response?

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