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S1-Q23.) In a 208 V system, using a clamp-on ammeter, you record A phase=57A, B phase=68A, and
C phase=59A. If the power factor is .92, calculate KW

a.) *20 KW
Correct. KW = (Volts * Amps * 1.732 * P.F.), KW = (208 * ((57 + 68 + 59)/3) * 0.92) = 20,328
Watts, 20,328/1000 = 20 KW.
b.) 13 KW
Incorrect.
c.) 60 KW
Incorrect.
d.) 5 KW
Incorrect.

S1-Q24.) Which of the following is the color code of phase wiring on a 480V, 3 phase system for ABC
rotation?

a.) yellow, orange, brown
C and B phases would be reversed.
b.) red, white, blue
While patriotic, R,W, and Blue are used in other voltage levels.
c.) black, red, blue
Black, Red, and Blue are not used in 480.
d.) *brown, orange, yellow
Correct. Consult the color coding guide.

S1-Q25.) The following symbol is a________ and the vertical line represents the _______.

a.) Resistor, value
Resistor is a saw-tooth symbol.
b.) Transistor, base
While transistors contain a PN junction like a diode, this is not the base input. Further the symbol for
a transistor is never shown with just a base. There is also an emitter and collector.
c.) Diode, anode
Anode is the positive end, which is the base of the arrow.
d.) *Diode, cathode
Correct. The vertical line indicates the negative or cathode of the diode.

Page 63 - EGSA Apprentice Certification Program Study Guide