Which of the following is defined by UL as a device that trips when a fault current to ground is 6mA or more?
A) Class H B) Class B C) Class A D) Class R
C
You might also like to view...
Why is it important to ask questions?
A) Because many industries do not have good standard operating procedures B) Because many industries do not have a good training program C) Because processes and technology involved are constantly changing and improving D) Because your boss will leave you alone
A potentiometer is a three-terminal device commonly used to control _____________
A. efficiency B. energy C. horsepower D. potential levels
Oil is removed from the refrigerant vapor by a
A) mist eliminator in the heater. B) valve in the cooler. C) filter in the condenser. D) coil in the vaporizer.
The principle for generating electricity from geothermal energy is similar to that for _____ .
A. nuclear power plants B. ?conventional hydroelectric facilities C. conventional steam power plants D. ?fossil-fuel energy plants