Free Printable MASTER CLOSEBOOK EXAM #2

1.

A 40/208/120v 3Ø transformer is connected to delta-wye. The secondary line voltage of the transformer is _____in the secondary.

a)

less than the phase voltage

b)

equal to the phase voltage

c)

greater than the phase voltage

d)

none of these

2.

The national Electric Code rules that apply to electric welders are covered in Article______.

a)

520

b)

600

c)

620

d)

630

3.

______ equipment of materials to which has been attached a label, symbol, or other identifying mark of an organization that is acceptable to the authority having jurisdiction and concerned with product evaluation that maintain periodic inspection of equipment or materials and indicates compliance with appropriate standards or performance.

a)

Listed

b)

Labeled

c)

Approved

d)

Tested

4.

What is the reason the Code requires each separate phase conductor to be located in the same raceway?

a)

to reduce inductive heat

b)

to improve workmanship

c)

to provide identification of a circuit

d)

to assure balance resistance

5.

A three-phase delta-wye connected transformer 480v primary, 208/120v secondary, the secondary line current is_____.

a)

equal to the secondary phase current

b)

greater than the secondary current

c)

less than the secondary phase current

d)

1.732 times the secondary phase current

6.

circuit breaker shall be marked with a voltage rating no less than the nominal system voltage that is indicative of heir capability to interrupt______ . I. Fault currents between phase II. Fault current from phase to ground

III. Fault currents between the neutral and ground

a)

I only

b)

I & II only

c)

II & III only

d)

I, II, or III

7.

The most common type of base used on standard incandescent light bulb of 300 watts or less is _____.

a)

candelabra

b)

mogul

c)

medium

d)

ad medium

8.

A ______of a switch is that part of a switch which is used for the making or breaking of a connection and which is electrically insulated from other contact making or breaking parts.

a)

line terminal

b)

pole

c)

contact block

d)

operating yoke

9.

The point of attachment of service drop conductors of a building or other structure shall in no case be less than____ feet.

a)

10

b)

12

c)

15

d)

18

10.

_____ of the following is a true statement.

I. Wiring above a nonfire rated ceiling shall not be supported by the ceiling support wires.

II. Wiring above a fire rated ceiling shall not be supported by the ceiling support wire,

III. Cables and raceways shall not be permitted to be supported by the ceiling grids.

IV. The ceiling support wire shall be permitted to support branch circuit wiring if in accordance with the ceiling manufacturer’s instructions.

a)

I & II only

b)

II & III only

c)

IV only

d)

I, II, III & IV only

11.

An isolated ground receptacles shall be identified by_____.

a)

CO/ALR orange marking on the face of the receptacles

b)

a metal faceplate not less than 0.030 inches in thickness

c)

a rest type test button the face of the receptacles

d)

an orange triangle located on the face of the receptacle

12.

The speed of a DC motor can be controlled by______.

a)

varying the armature current while the field currents are held constant

b)

varying the field current while the armature current is held constant

c)

varying the armature voltage while the field voltage is held constant

d)

varying the field voltage while the armature voltage is held constant

13.

If a three-phase delta-wye transformer bank having a 480v primary and a 200v secondary is considered to be 100% efficient, and to have resistive-type loads, the maximum of the load be______.

I. Equal to kva secondary of the transformer

II. Equal to the primary kva of the transformer

III. Considerably less than the kva of the transformer

a)

I only

b)

II only

c)

I & II only

d)

I, II & III

14.

Surrounded by a case, housing, fence, or walls that prevent persons from accidentally contacting energized parts is_____.

a)

enclosed

b)

isolated

c)

guarded

d)

concealed

15.

_______ means that equipment is not readily accessible to persons unless special means for access are used.

a)

Isolated

b)

Guarded

c)

Elevated

d)

Concealed

16.

______location are those that are hazardous because of the presence of easily ignitable fibers or flying.

a)

Class I

b)

Class II

c)

Class III

d)

Class II, division II

17.

The Code is divided into the introduction and nine chapters; Chapter 1, 2, 3, and 4 apply generally and the latter chapters supplement or modify the general rules except Chapter ______which is independent of the other chapters except where specifically referenced therein.

a)

6

b)

7

c)

8

d)

9

18.

A transformer would mostly likely have an efficiency of _____ percent.

a)

60

b)

70

c)

80

d)

90

19.

Where lighting outlets are installed in interior stairways, there shall be a wall switch at each floor level control the lighting outlet where the difference between floors levels is______ steps or more.

a)

1

b)

3

c)

5

d)

6

20.

The installation of wiring and equipment for fire alarm systems including all circuits controlled and powered by the fire alarm system is covered in Article_____.

a)

695

b)

710

c)

725

d)

760

21.

A conducting material that is ______charged will have an excess of electrons.

a)

neutrally

b)

negatively

c)

positively

d)

none of these

22.

Where three single phase transformers are connected in such a way that the line currents is equal to the phase current this transformer is______ connected.

a)

delta

b)

wye

c)

delta zig-zag

d)

delta high leg

23.

______ losses in an iron core transformer occur when materials are used that retain a large part of their magnetization after the magnetizing force is removed. These materials are said to have a high permanence.

a)

Eddy current

b)

Saturation

c)

Copper

d)

Hysteresis

24.

The difference between a neutral and a grounded circuit conductor is_____.

a)

only a neutral will have equal potential to the ungrounded conductor

b)

only a neutrals outer covering is white or natural gray

c)

only a neutral carries unbalanced current

d)

there is no difference

25.

A piece of electrical equipment that is designed to operate intervals of (1) load and no load; or (2) load and rest; or (3) load, no load, and rest is called_____ duty.

a)

short time

b)

intermittent

c)

periodic

d)

varying

26.

Insulated conductors of #______ or smaller, intended for use as grounded conductors of circuits shall have an outer identification of white or natural gray color.

a)

6

b)

4

c)

3

d)

1

27.

_______covers and plate shall be permitted with nonmetallic boxes.

I. Nonmetallic II. Metal

a)

I only

b)

II only

c)

either I or II

d)

neither I or II

28.

A light fixture to be installed in a wet location shall be______.

I. Installed so that water will not accumulate in wiring compartment

II. Installed so that water will not enter the wiring compartment

III. Marked suitable for damp locations

a)

I only

b)

II only

c)

I, II & III

d)

I & II only

29.

The general requirement for communication circuits such as telephone, telegraph, outside wiring for fire alarm and burglar alarms is covered in Article ______of the NEC.

a)

720

b)

725

c)

760

d)

800

30.

The general requirements for all circuits and equipment operating at more than 600 volts nominal is mostly covered in Article_____.

a)

695

b)

490

c)

725

d)

760

31.

Thermal protection is required by the NEC for_____.

I. Fluorescent lighting fixture ballast installed indoors

II. Fluorescent lighting fixtures ballast installed outdoors

III. Recessed incandescent fixtures installed indoors

a)

I and II only

b)

I and III only

c)

I and II only

d)

I, II, and III

32.

All conductors of the same circuit and, where used, the grounded conductor and all equipment grounding conductors shall be contained within the same______.

I. Cable II. Raceway III. Trench

a)

I only

b)

II only

c)

I and II only

d)

I, II, and III

33.

When a circuit breaker is in the OPEN position______.

I. You have a short in the ungrounded conductor

II. You have a short in the grounded conductor

a)

I only

b)

II only

c)

either I or II

d)

both I and II

34.

An electrical outlet constructed so that moisture will not enter the enclosure is classified as being _____.

a)

waterproof

b)

rainproof

c)

watertight

d)

weatherproof

35.

You have an adjustable trip coil rated at 5 amps on a 200-amp switch. If you want the switch to trip at 120 amps, the trip coil should be set at_____.

a)

2 amps

b)

3 amps

c)

4 amps

d)

5 amps

36.

After cutting a conduit, to remove the rough edges on both ends, the conduits should be_____.

a)

sanded

b)

shaped

c)

burnished

d)

ground

37.

One should use an insulated basket grip to attach a pull line to the conductors because a bare steel grip should not be used because it will_____.

a)

react with the conductor

b)

stretch the conductor

c)

score the conduit during the pull

d)

reduce the coefficient of friction

38.

The instrument used to indicate phase relation between current and voltage is the______.

a)

megger

b)

power factor meter

c)

voltmeter

d)

galvanometer

39.

Reactance will cause the current in a circuit to vary only when_____.

a)

AC current flows

b)

DC current flows

c)

there is no resistance in the circuit

d)

there is resistance in the circuit

40.

Fixtures supported by the framing members of suspended ceiling system shall be securely fastened to the ceiling framing member by mechanical means. This would include all but which of the following?

a)

fixture wire

b)

bolts or screw

c)

rivets

d)

clips identified for this use

41.

Which two conductors installed in a conduit can be filled to______% of its cross section.

a)

53

b)

31

c)

40

d)

60

42.

In a resistance, no point along the floor line in any wall space may be more than ______feet.

a)

6

b)

6 1/2

c)

12

d)

10

43.

Which of the following electrodes must be supplemented by an additional electrode?

a)

metal underground metal pipe

b)

metal frame of a building

c)

ground ring

d)

concrete encased

44.

Plaster, dry wall or plasterboard surfaces that are broken or incomplete shall be repaired so there will be no gaps or open spaces greater than_____ inch at the end of the fitting box.

a)

1/6

b)

1/8

c)

3/16

d)

1/4

45.

When marking electrical connection, a torque screwdriver or wrench is required because_____.

I. Many terminations and equipment are marked with a tightening torque

II. Control circuit devices with screw-type pressure terminals used with #14 or smaller copper conductors shall be torque to a minimum of 7lb-in. unless identified for a different torque value

III. Listed or labeled equipment shall be installed and used in accordance with any instructions include in the listing or labeling

a)

I only

b)

I and II only

c)

II only

d)

I, II, and III

46.

The SPST switch can control______.

a)

one circuit

b)

two circuits, but not at the same time

c)

two circuits at the same time

d)

more than two circuits

47.

In the “OFF” position, a good switch will have______ resistance.

a)

high

b)

moderate

c)

zero

d)

variable

48.

In the circuit below which resistor will consume the most power?

a)

2Ω

b)

4Ω

c)

6Ω

d)

8Ω

49.

In the circuit below which resistor will consume the most power?

a)

2Ω

b)

4Ω

c)

6Ω

d)

8Ω

50.

The tool that is used to align vitrified tile conduit in multiple ducts is a_______.

a)

mandrel

b)

manometer

c)

growler

d)

hickey

MASTER CLOSEBOOK EXAM #2

Total questions: 50

Worksheet time: 25mins

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