In the HVAC/R industry, __________ are often used to shift sections of metal ductwork during installation to prevent surface damage.
A. ball peen hammers
B. cold chisels
C. rubber mallets
D. wooden mallets
Answer: C
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When the field winding of a DC motor is connected in parallel with the armature, the motor is called a _____ motor.
A. series B. shunt
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Underground service conductors installed as a cable assembly are required to be buried at least __________ feet by the NEC®.
a. 1 b. 2 c. 3 d. 4
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___________ is the removal of vegetable matter from fleece by chemical means
a. Carbonizing c. Boiling b. Scouring d. Drying
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What is the minimum allowable oil pressure differential before an oil safety control will trip?
a. 10 psig b. 20 psig c. 30 psig d. 40 psig
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