Which refrigerant used in residential air conditioning has operating pressures that are about 40% to 70% higher than that of R-22?

A. R-22
B. R-410A
C. R-134a
D. R-12


Answer: B

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The civil engineer’s 20 scale is often used in mechanical drafting as a , decimal-inch scale.

a. full b. half c. quarter d. double

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One cycle occurs when the rotor, or conductor, cuts the magnetic field of a north pole and south pole.

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

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Why is "inches of water column" used to measure gas pressure instead of psig?

What will be an ideal response?

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Multiply the following fractions and reduce to lowest terms:   2 1/8 x 4 1/2 =

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

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