Year 3 Rocks!
4. Where each luminaire draws 1.2 amps, if more than ______ luminaires are connected to Ckt. LA-4, the circuit breaker will be overloaded. Fluorescent luminaires have been installed in several offices in a business and connected to these circuits. The offices will be used continuously during the business day.
a. 16
b. 17
c. 11
d. 12
e. 13
What is 13?
(e.) 20-A breaker can be loaded to 80% of its rating where carrying continuous loads.
1.2 A x 13 fixtures = 15.6 amps where the breaker can carry 16 amps
18. The ground clamp, for attachment to an aluminum grounding electrode conductor, is not permitted to be located within ____" of the earth.
a. 18
b. 24
c. 30
d. 36
What is 18 inches?
(a.)
NEC 250.64(A)
81. A(n) _______ is used to ensure that a motor rotates in the correct direction when connected to a circuit.
a. oscilloscope
b. megohmmeter
c. phase sequence indicator
d. digital logic probe
e. ammeter
f. none of the above
What is a phase sequence indicator?
(c.) EMC 5e-Sec 3-3
22. Bonding jumpers used on metal raceways enclosing GECs are sized according to Table _____
a. 250.66
b. 250.122
c. 250.102(C)(1)
d. 250.64(E)(3)
What is 250.64(E)(3)?
(d.)
11. Which of the following three-phase electrical distribution systems is grounded?
I. 120/208-volt, three-phase, four-wire
II. 277/480-volt, three-phase, four-wire
III. 480-volt, three-phase, three-wire
a. I only
b. II and III only
c. III only
d. I, II, and III
e. I and II only
f. II only
What is 277/480-volt, three-phase, four-wire?
(e.) II only
54. On the BCES project for 277-volt branch-circuit conductors that exceed ____ feet in length, the smallest permitted size is 10 AWG.
a. 100
b. 150
c. 360
d. 120
e. 200
What is 200?
(e.)
5. Which of the following conditions would be classified as an overcurrent?
I. a 32-A continuous load connected to a 40-A fuse
II. an ungrounded conductor touching a grounded condutor
III. an ungrounded conductor touching a grounding conductor
a. I only
b. II only
c. I and II only
d. II and III only
e. I, II, and III
What is an ungrounded conductor touching a grounded conductor and an ungrounded conductor touching a grounding conductor?
(d.) II and III only
2017 NEC 100_Overcurrent
79. ____ power is the actual power used in an electrical circuit and is measured in W.
a. True
b. Apparent
c. Reactive
What is True Power?
(a.) EMC 5e Sec 1-4
31. Where a 2/0 AWG bare copper ground ring is installed, the minimum size GEC permitted from the service equipment to the ground ring is _____ AWG. A 4/0 AWG GEC is the minimum required size to building steel.
a. 2/0
b. 4
c. 6
d. 1/0
e. 2
What is 2/0?
(a.)
NEC 250.66(C)
68. How far west of Column 12.9 is the finished surface of the west wall in BCES Room A109?
a. 6'-9"
b. 16'-1 3/4"
c. 16'-10 1/2"
d. 6'-4 1/8"
e. 16'-6 5/8"
What is 16'-6 5/8"?
(e.)
10'-2 1/2" + 6'-9"- 4 7/8" = 16'-6 5/8"
49. You have installed 465 feet of PVC underground from a breaker panel to a sigh. The sign circuit is protected with a 15-amp breaker. The 277-volt sign will draw 11.6 amps. Use K=10.86 for your calculations. You must install at least a _____ AWG grounding conductor with the sign circuit. The specifications require that you limit your voltage drop to 2%.
a. 4
b. 12
c. 8
d. 10
e. 6
What is 6?
(e.)
23. Section 250.64(E) requires that when a grounding electrode conductor is installed in a metal raceway, it shall be bonded to the raceway at ______.
a. the end closer to the service equipment
b. both ends
c. the main grounding locknut or bushing
d. none of these
What is both ends?
(b.)
143. A solenoid converts electrical energy into _____.
a. rotary mechanical energy
b. a linear mechanical force
c. an audible signal
d. all of these
e. none of these
What is a linear mechanical force?
(b.) EMC 5e- SEC 7-2
44. Which of the following finishes is not permitted by NEC 250.119 for an equipment grounding conductor furnished as part of a cord or cable assembly?
a. green
b. bare
c. green with one or more white stripes
d. green with one or more yellow stripes
What is green with one or more white stripes?
(c.)
13. In a 277/480-volt, 3-phase, 4-wire system, the maximum voltage to ground is _______.
a. 120 volts
b. 240 volts
c. 208 volts
d. 277 volts
e. none of these
What is 277 volts?
(d.)
48. A set of three-phase feeder conductors are run under the floor slab in rigid polyvinyl chloride (PVC) conduit to feed a distribution panel in a remote part of a factory. If the conductors are size 4/0 AWG protected on the supply end with a 225-ampere circuit breaker, the minimum size equipment grounding conductor permitted to be run with the circuit conductors is _____ AWG.
a. 10
b. 8
c. 6
d. 4
e. 3
What is 4 AWG?
(d.)
225 A = 4AWG
29. For alternating-current (AC) systems, the maximum sizes of grounding electrode conductors required are _______.
a. 8 AWG copper or 6 AWG aluminum
b. 3/0 AWG copper or 250 kcmil aluminum
c. in no case larger than 2/0 AWG, unless paralleled
d. none of these
What is 3/0 AWG copper or 250 kcmil aluminum?
(b.)
NEC 250.24(D)/ NEC 250.66 (Table)
140. ____ is the frequent starting and stopping of a motor for short periods of time.
a. interfacing
b. breakover
c. jogging
d. positioning
e. interlocking
What is Jogging?
(c.) EMC 5e-SEC 5-4
41. Which of the following is not permitted to serve as an equipment grounding conductor?
a. a metallic raceway
b. a bare conductor included a part of a listed cable assembly
c. a metallic cable sheath or armor
d. a metallic water piping system
What is a metallic water piping system?
(d.)
NEC 250.118
57. According to the BCES specs, transformers with ratings smaller than _____kVA are to have two 5 percent below rated voltage, full-capacity taps on the primary winding.
a. 100
b. 45
c. 75
d. 15
e. 30
What is 15?
(d.)
145. Which of the following is a manual control device?
I. single-pole toggle switch
II. NC momentary-contact pushbutton switch
III. float switch
IV. NO momentary-contact pushbutton switch
a. I, II, and IV only
b. I only
c. III only
d. I, II, III, and IV only
e. II and IV only
What is single-pole toggle switch, NC momentary-contact pushbutton switch, and NO momentary-contact pushbutton switch?
(a.) I, II, and IV only
19. Which of the following are permitted to be used to protect a GEC from physical damage?
I. ENT
II. Sch 80 PVC
III. RMC
a. I or II or III
b. II or III only
c. III only
d. I or III only
e. none of these
What is Sch 80 PVC and RMC only?
(b.)
118. Motors that are to be forward-and reverse-operated can be prevented from attempting to do both simultaneously by which of the following methods?
a. By using mechanically interlocked forward-reverse pushbutton switches
b. By using two separate motor starters with one NO and on NC set of contacts on each starter
c. By using one mechanically interlocked reversing starter
d. Any of these methods will work
e. None of these methods will work
What is "any of these methods will work"?
(d.) EMC 5e SEC 15-3
45. A 600-amp, 277/480-volt, 3-ph, 4-wire feeder is installed underground in PVC from one building to deliver power to a 600-A safety switch (fused at 600A) that is installed on another building. The parallel feeder consists of two separate conduits with four each 350 kcmil conductors in conduit.
The smallest EGC conductor that can be installed in each conduit is a ____ AWG.
a. 4
b. 1
c. 2
d. 3
e. 1/0
What is 1 AWG?
(b.)
NEC 250.122(F)
147. A set of normally open contacts contained in a lighting contactor is _____ when the coil is _______.
a. closed------- energized
b. open------- de-energized
c. both a and b
d. neither a nor b
What is closed----energized and open----de-energized?
(c.) both a and b