When a 60-hertz AC, wound rotor motor is accelerated, the frequency induced in the secondary circuit decreases from 60 hertz at zero speed to ____ hertz at full speed.
a. 2 or 3
b. 4 or 5
c. 6 or 7
d. 8 or 9
a. 2 or 3
You might also like to view...
According to NEC Article 424, radiant heating panels installed in concrete or poured masonry must not exceed _____.
a. 16W/ft2 of heated area b. 25W/ft2 of heated area c. 33W/ft2 of heated area d. 43W/ft2 of heated area
Asking yourself, “What are some of the things known about the problem?” is a part of which step in a basic engineering problem solution?
a. Defining the problem b. Simplifying the problem c. Performing the solution or analysis d. Verifying the results
Centering tabs and spacers are used to center the seal during installation and then removed after the seal
assembly is secured in place on _____ seals. a. tandem b. metal bellows c. cartridge d. balanced
What is a general characteristic of all Light Emitting Diodes?
A) All LED's have the same voltage drop B) LED's can emit any color in the spectrum C) All LED's emit infrared radiation D) The amount of light output is proportional to forward current