A mechanical refrigeration system cools a room by:
A) Realigning the air molecules in the room.
B) Removing heat from the room.
C) Radiating cold energy into the room.
D) Adding cold to the room until the level of cold reaches the proper level.
B
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Seam welds can be made by producing a series of overlapping ____ or be one continuous resistance weld.
A. groove welds B. plug welds C. butt welds D. spot welds
A pending code is set when a fault is detected on ________
A) A one-trip fault item B) A thermostat problem (too long to closed-loop status) C) The catalytic converter efficiency test D) The first fault of a two-trip failure
The location for a rooftop unit will be partly determined by:
A) The distance that a crane can reach over the edge of the building. B) The easiest place to cut a hole in the roof. C) The clearest path available for sliding the unit across the roof. D) The availability of anchor points for attaching the drag winch.
Three lines supply power to a three-phase motor. If one of these lines should open, the motor will be connected to single-phase power. This condition is known as _____.
A. double-phasing B. single-phasing C. triple-phasing D. free-running