Why are capacitors rated at higher voltages than the unit line voltage?
A) They are overrated as a safety measure.
B) Charging and discharging in series with an inductive load subjects them to high voltage.
C) They are charged with a high voltage at the factory.
D) Capacitors increase the voltage to the motor.
B
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What written change modifies the specifications for a project?
a. change order c. addendum b. amendment d. notation
Which of the following is not considered one of the three main independent testing laboratories for electrical lighting fixtures?
a. National Electrical Manufacturers Association b. Underwriters Laboratories c. Canadian Standards Association d. Electrical Testing Laboratories
Contaminants that can be found in recovered refrigerant include:
A) Oil and noncondensables. B) Water and acid. C) Carbon, oil, noncondensables, water, and acid. D) Carbon and particulates.
How many steps are required to calculate the heat necessary to change 10 lb of ice at -20°F to steam at 250°F?
A) One B) Three C) Two D) Six