ELECTRICAL TEST ANSWERS
May 21, 2003
1. A Class 1 signaling circuit shall not exceed ______________ volts.
A. 130
B. 150
C. 220
þ D. 600 National Electrical Code, Section 725-21(b)
2. Motors and their associated equipment must be protected against overcurrent (overload, shortcircuit, or ground-fault), but because of the special characteristics of induction motors, overcurrent
protection is generally accomplished by having the overload protection separate from the short-circuit
and gro und-fault protection.
þ A. True
National Electrical Code, Section 430-32, 430-52
B. False
3. In multiwire circuits, the continuity of the ___________ conductor shall not be dependent upon
the device connections.
A. ungrounded
þ B. grounded National Electrical Code, Section 300-13(b)
C. grounding
D. A and B
4. The __________ is defined as the area between the top of the direct burial cable and the finished
grade.
A. notch
þ B. cover
National Electrical Code, Section 300-5 Table of the heading
C. gap
D. none of these
5. What is the power consumed of a 10kW heat strip rated 230 volts connected to a 115-volt circuit?
A. 10 kW
þ B. 2.5 kW
C. 5 kW
D. 20 kW
R = E2/PR = 230 volts
R = 230 volts2/10,000 watts R = 5.29 ohm
P = E2/R = 115 volts
P = 1152/5.29 ohm
P = 2,500 watts/1,000 = 2.5 kW