Maintenance Exam: Practice Exam #2 (Dewalt - 2017)

AS a general rule, branch-circuit conductors that supply single AC motors used in a continuous-duty application shall have an ampacity of NOT less than _____ percent of the motor's full-load running current rating. A. 125 B. 100 C. 150 D. 115

A. 125 430.22 pg. 302

In general, branch-circuit conductors serving continouse loads, such as luminaries in an office building or any commercial establishment, shall have an ampacity of NOT less than ___ of the load. A. 125% B. 115% C. 150% D. 80%

A. 125% 210.19(A)(1)(a) pg. 62

When exemptions are not a consideration, electrical metallic tubing (EMT) shall be securely fastened within ____ of each junction box, panel board, or other conduit termination. A. 3 feet B. 6 feet C. 8 feet D. 10 feet

A. 3 feet 358.30(A) pg. 210

One horsepower is equal to _______ watts? A. 746 B. 1,000 C. 1,250 D. 1,500

A. 746 General Knowledge

Given: An electrical metallic tubing (EMT) 50 feet in length to be installed will contain a total of nine (9) conductors. Six (6) of these wires are considered to be current-carrying. What is the adjustment factor, in percent, that must be applied to the ampacity of the current-carrying conductors? A. 80 % B. 70% C. 60% D. 50%

A. 80% Table 310.15(B)(3)(a) pg. 148

Compliance with the provisions of the NEC will result in an electrical installation that is essentially ______. A. free from hazard B. a good electrical system C. an efficient system D. all of these

A. free from hazard 90.1(B) pg. 30

When an insulated black-colored conductor is identified by three (3) continuous white or gray stripes along its entire length, it is considered a/an _______. A. grounded conductor B. ungrounded conductor C. equipment grounding conductor D. phase of a delta-connected system

A. grounded conductor 200.7(A)(2) pg. 56

Electrical equipment rooms or enclosures housing electrical apparatus of not over 1000 volts that are controlled by a lock (s) shall be considered accessible to _____. A. qualified persons only B. electricians only C. the building management D. the authority having jurisdiction

A. qualified persons only 110.26 (F) pg. 49

Under normal conditions, an equipment grounding conductor will ______. A. improve current flow B. not carry current C. carry current D. reduce circuit resistance

B. Article 100 Trade knowledge pg. 37

Metal conduit installed in indoor wet locations must have a MINIMUM airspace clearance of ______ between the conduit and the wall or supporting surface. A. 1/8in B. 1/4in C. 1/2in D. 3/8in

B. 1/4in 300.6(D) pg. 138

When an electrical trade size 3/4 inch electrical metallic tubing (EMT) is in excess of 24 inches of length, the conduit is permitted to contain NO more than ____ size 10 AWG conductors with THWN insulation. A. 6 B. 10 C. 8 D. 14

B. 10 Annex C, Table C.1 pg. 714

What is the approximate MAXIMUM distance a single-phase, 240-volt, 42-ampere load may be located from a panelboard, where given the following related information? - Copper conductors, K = 12.9 - Size 8 AWG THWN/THHN conductors are used - Limit voltage drop to 3% A. 50 feet B. 110 feet C. 160 feet D. 195 feet

B. 110 feet Chapter 9, Table 8 Distance Formula: 1st find allowable VD-240Vx3%=7.2V D=CM x VD/2 x K x I = 16,510 x 7.2 /2 x 12.9 x 42 = 118,872/1,083.6 = 109.7 ft

Disregarding exceptions, the overcurrent protection for size 12 AWG copper conductors, regardless of the insulation type, shall not exceed _____. A. 15 amperes B. 20 amperes C. 25 amperes D. 30 amperes

B. 20 amperes 240.4(D)(5) pg. 94

How much clear working space is required to be maintained between a 3-phase 480Y/277V main switchboard and a concrete block wall? A. 3 feet B. 3 feet, 6 inches C. 4 feet D. 4 feet, 6 inches

B. 3 feet, 6 inches Table 110.26(A)(1), Condition 1 pg. 47

The NEC permits electrical trade size 3/4 inch flexible metal conduit (FMC) to be used for tap conductors (fixture whips) to luminaires, provided the length of the FMC does NOT exceed ____. A. 4 feet B. 6 feet C. 8 feet D. 10 feet

B. 6 feet 348.20(A)(2)(c) pg. 199

Unless listed and identified otherwise, terminations and conductors rated 100 amperes or larger shall be rated at ____. A. 60 C B. 75 C C. 60 F D. 90 C

B. 75 C 110.14(C)(1)(b)(1) pg. 45

When inverse time circuit breakers are used to switch 120-volt and 277-volt, high-intensity discharge lighting branch-circuits, the circuit breakers shall be listed and marked ___. I. SWD II. HID A. I only B. II only C. either I or II D. neither I or II

B. II only 240.83(D) pg. 100

The reason the NEC requires all grounded and ungrounded conductors of a common circuit to be installed together in the same ferrous metal raceway is to reduce ______. A. expense B. inductive heat C. voltage drop D. resistance

B. inductive heat 300.20(A) pg. 141

Given: A 9kW rated 208-volt, 3 phase electric steamer is to be installed in the kitchen of a commercial establishment; the steamer will draw ____ of current. A. 43 amperes B. 4.3 amperes C. 25 amperes D. 75 amperes

C. 25 amperes 3-phase Current Formula I=P/E x 1.732 I = 9Kw x 1000 / 208 x 1.732 I = 9000w/360.25V I = 24.9 amperes

Where branch-circuit conductors supplying a fluorescent or HID luminaire are contained within the ballast compartment and are within 3 in. of the ballast, the conductors are required to have an insulation temperature rating NOT lower than ______. A. 60 C. B. 75 C C. 90 C D. 110 C

C. 90 C 410.68 pg. 271

A motor with nine leads coming out of it is a ______ motor. A. two phase B. two speed C. dual voltage D. multi-speed

C. dual voltage Trade Knowledge

For continuous-duty motors, the motor nameplate current rating is used to determine the side of the ______ required for the motor. A. disconnecting means B. branch circuit conductors C. motor overload protection D. short-circuit protection

C. motor overload protection 430.6(A)(2) pg. 298

Where the premises wiring systems has branch-circuits supplied from more than one nominal voltage system, each ungrounded conductor of a branch-circuit shall be identified by ____ at the panelboard. A. floor B. voltage C. phase and system D. room

C. phase and system 210.5(C)(1) pg. 57

The MINIMUM required width of the working space in front of panelboards, switchboards, disconnects, and motor controllers. rated 1000 volts or less, shall be the width of the equipment or NOT less than _____, whichever is greater. A. 2 feet B. 3 feet C. 4 feet D. 30 inches

D. 30 inches 110.26(A)(2) pg. 47

On a four-wire, delta-connected system, the conductor having the higher voltage to ground (high-leg) shall be identified as ___ in color, if the grounded conductor is also present to supply lighting or similar loads. A. white B. red C. green D. orange

D. orange 110.15 pg. 45