In a magnetic N.O. contactor, the circuit is closed when _____.

a. a spring returns the armature to the initial position
b. the moveable contact makes contact with the stationary contact
c. the AC waveform is zero
d. power is applied to the coil


b. the moveable contact makes contact with the stationary contact

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____ provide the measurements used for construction.

A. Annotations B. Dimensions C. References D. Amendments

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The output voltage of a circuit at 70.7% of its maximum level measured in dB is:

A) -3 dB. B) 7 dB. C) -7 db. D) 3 dB.

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ACCA's Manual J:

A) Provides detailed procedures for installing air-conditioning equipment. B) Is a national best practices overview for system installation. C) Provides a complete list of board jumper locations. D) Is used for determining the heat gain of a residential structure.

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The outside diameter of a hose is 2 1/2 inches, and the wall is 5/32 inch thick. How large, in inches, is the inside diameter?

A. 1 5/8 B. 2 3/16 C. 2 5/16 D. 2 7/16

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