Circuit breakers are grouped for identification according to _____.

a. line and load terminals
b. given current ranges
c. normal ambient temperatures
d. solid-state circuitry


b. given current ranges

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Twelve 14 AWG copper conductors with type RHW insulation are to be installed in conduit in an area with an ambient temperature of 110 degrees F (43 degrees C). What will be the ampacity of these conductors?

A. 4.1 amperes B. 8.2 amperes C. 16.4 amperes D. 32.8 amperes

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For testing samples taken from truck mixers, the concrete discharge rate should be regulated by _____.

a. the size of the discharge gate opening b. fluidity of the mix c. the capacity of the sampling container d. the rate of drum rotation

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Air being blown out of a building with a blower is called

A) infiltration B) exfiltration C) ventilation D) exhaust

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When a manual service valve is backseat cracked:

A) Both the service port and the line are open to the system. B) The service port is open and the system is closed to the line. C) The service port is closed and the system is open to the line. D) Both the service port and the line are closed to the system.

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