wayground logo

Free Printable Worksheets

NEW

Font size

S
M
L
XL
Worksheets

FOR PREPARTION

Total questions: 45

Worksheet time: 23mins

Name
Class
Date
1.

A general term including material, fittings, devices, appliances, fixtures, apparatus, and the like used as part of, or in connection with, an electrical installation is __.

a)

.premises wiring (system)

b)

service equipment

c)

utilization equipment

d)

equipment

2.

A switch intended for use in general distribution and branch circuits. It is rated in amperes, and it is capable of interrupting its rated current at its rated voltage, is a __ switch.

a)

bypass isolation

b)

general use

c)

isolating

d)

transfer

3.

The permanent joining of metallic parts to form an electrically conductive path that will ensure electrical continuity and the capacity to conduct safely any current likely to be imposed is known as ___.

a)

ordinary tap joint

b)

scarf joint

c)

britannia joint

d)

bonding

4.

A circuit breaker that has purposely introduced into a delay in the tripping action and which delay decreases as the magnitude of the current increases is a __ circuit breaker.

a)

inverse time

b)

adjustable

c)

control vented

d)

vented power

5.

A switch intended for isolating an electric circuit from the source of power that thas no interrupting rating, and it is intended to be operated only after the circuit has been opened by some other means is a/an ___.

a)

isolating switch

b)

general-use switch

c)

bypass isolation switch

d)

transfer switch

6.

Not readily accessible to persons unless special means for access are used is ___

a)

elevated

b)

guarded

c)

isolated

d)

listed

7.

The definition of ampacity is

a)

the current-carrying capacity of conductors expressed in volt-amps

b)

the current-carrying capacity expressed in amperes

c)

the current-carrying capacity of conductors expressed in wattage

d)

the current in amperes a conductor can carry continuously under the conditions of use without exceeding its temperature rating.

8.

The definition of ambient temperature is

a)

the temperature of the conductor

b)

the insulation rating of the conductor

c)

the temperature of the area surrounding the conductor

d)

the maximum heat the insulation can be used within

9.

Type of service where both the load and the time intervals may have wide variations.

a)

Continuous

b)

Periodic

c)

Intermittent

d)

Varying

10.

Special permission is ___.

a)

granted by the electrical foreman on the job

b)

verbal permission by the inspector

c)

given only once on one blueprint change request

d)

the written consent of the authority having jurisdiction

11.

An overcurrent protective device with a circuit opening fusible part that is heated and severed by passage of overcurrent through it is called ___.

a)

current-limiter

b)

fuse

c)

circuit breaker

d)

thermal overload

12.

The service conductors between the terminals of the service equipment and a point usually outside the building, clear of building walls, where joined by tap or splice to the service drop is called ___

a)

service drop

b)

service-entrance

c)

service equipment

d)

none of these

13.

A dwelling unit is ___.

a)

one unit of an apartment

b)

one or more rooms used by one or more persons

c)

one or more rooms with space for eating, living and sleeping

d)

one or more rooms used as a housekeeping unit and having permanent cooking and sanitation provisions

14.

Where the conductor material is not specified in the Code, the conductors are assumed to be ___.

a)

bus bars

b)

aluminum

c)

copper-clad aluminum

d)

copper

15.

Mandatory rules of the Code are identified by the use of the word ___.

a)

should

b)

shall

c)

must

d)

could

16.

Advisory rules of the Code are identified by the use of the word ___

a)

should

b)

shall

c)

must

d)

could

17.

. Continuous duty is ___.

a)

a load where the maximum current is expected to continue for three hours or more

b)

a load where the maximum current is expected to continue for one hour or more

c)

intermittent operation in which the load conditions are regularly recurrent

d)

operation at a substantially constant load for an indefinitely long time

18.

An enclosure designed either for surface or flush mounting and provided with a frame, mat or trim in which a swinging door or doors are or may be hung is ___

a)

cabinet

b)

panelboard

c)

cutout box

d)

switchboard

19.

All wiring must be installed so that when completed ___.

a)

it meets the current-carrying requirements of the load

b)

it is free of shorts and unintentional grounds

c)

it is acceptable to the Code compliance authorities

d)

it will withstand a hy-pot test

20.

So constructed or protected that exposure to the weather will not interfere with successful operation defined the __

a)

Weather proof

b)

Weather tight

c)

Weather resistant

d)

All weather

21.

. The current-carrying capacity of conductors expressed in amperes is ___.

a)

demand

b)

. pressure

c)

ampacity

d)

duty-cycle

22.

Service raceways shall be equipped with a ___ service head at the point of connection to service drop conductors.

a)

rain tight

b)

weather proof

c)

rain proof

d)

watertight

23.

A circuit breaker with a trip setting of not more than __ times the ampacity of conductor shall be considered as to provide the required short circuit protection.

a)

3

b)

4

c)

5

d)

6

24.

Service conductors in cable shall NOT be smaller than ____

a)

3.5 mm2

b)

5.5 mm2

c)

8.0 mm2

d)

14.0 mm2

25.

. Using aluminum or copper clad aluminum conductors, the minimum size of service entrance conductors shall be ____.

a)

3.5 mm2

b)

5.5 mm2

c)

8.0 mm2

d)

14.0 mm2

26.

The lighting load for a dwelling unit expressed in terms of volt-ampere per sq. meter must be at least _______.

a)

12

b)

16

c)

24

d)

28

27.

In dwelling units, at least one wall receptacle outlet shall be installed within _________mm of the outside edge basin or bath tub.

a)

600 mm

b)

900 mm

c)

1200 mm

d)

1600 mm

28.

Power circuit breaker can be classified according to operation, some of these are, except

a)

Inclined break

b)

Horizontal break

c)

Gravity open

d)

Gravity close

29.

Outlets for specific appliances such as laundry equipment, shall be within ___ of the appliance.

a)

1800 mm

b)

1200 mm

c)

1600 mm

d)

2200 mm

30.

An insulated grounded conductor of 14mm2 or smaller shall be identified by a continuous _______ outer finish along its entire length.

a)

green

b)

black

c)

green with yellow stripes

d)

white or natural

31.

The following are the standard ampere rating of a breaker which one is NOT?

a)

40

b)

45

c)

50

d)

55

32.

A fuse or an overcurrent trip unit of a circuit breaker shall be connected in ________ with each ungrounded conductor.

a)

Series

b)

Parallel

c)

Parallel

d)

None of the above

33.

. Enclosures for overcurrent devices shall be mounted in a ___ position unless in individual instances this is shown to be impracticable and is installed in accordance with 2.40.33 (PEC 2.40.33)

a)

Horizontal

b)

Diagonal

c)

open

d)

vertical

34.

An overcurrent trip unit of a circuit breaker shall be connected in series with each___. (PEC 2.40.2.1)

a)

Ungrounded conductor

b)

Overcurrent Device

c)

Grounded conductor

d)

Transformer

35.

Fuses and circuit breakers shall be located or ________ so that the persons will not be burned or otherwise injured by their operation. ( PEC 2.40.4.2 (a) )

a)

Protected

b)

Guarded

c)

Shielded

d)

None of the above

36.

The neutral conductor shall not be _______. ( PEC 2.40.2.3)

a)

stranded

b)

solid

c)

insulated

d)

fused

37.

What is the minimum size of grounding electrode copper conductor (PEC 2.50.3.17 )

a)

3.5 sq.mm

b)

5.5 sq.mm

c)

8.0 sq.mm

d)

14 sq.mm

38.

The conductor with the highest insulation temperature rating is________. (PEC Table 3.10.1.13)

a)

THWN

b)

RH

c)

RHH

d)

THW

39.

Concrete, brick or tile walls are considered as being. (PEC 3.0.1.6 b)

a)

Isolated

b)

Insulators.

c)

Grounded

d)

Dry Locations

40.

Is it permissible to install direct current and alternating current conductors in the same outlet box. (PEC 3.0.1.3 c1)

a)

Yes, if insulated for the maximum voltage of any conductor

b)

No, never

c)

Yes, if the ampacity is the same for booth conductors

d)

Yes, in dry places

41.

The neutral conductor _______. (PEC 3.10.1.15 b4 )

a)

Is always the white grounded conductor

b)

Has 70 % applied for a household clothes dryer for a branch circuit

c)

Never apply ampacity corrections

d)

Carries the unbalance current

42.

Installing more than three current carrying conductors in the same conduit requires _______. ( PEC 3.10.15.b 2 a )

a)

A larger conduit

b)

High heat rated conductors

c)

Derating Ampacity

d)

Continuous loading

43.

The Code rule for maximum 90- degree bends in a conduit between two boxes is four, the most likely reason for the total 360-degree limitation is (PEC 3.50.2.7)

a)

It is unsafe

b)

It makes pulling the conductors through the conduit too difficult

c)

You can damaged the galvanized coating on the conduit

d)

Too many bends require extra wire to be pulled

44.

The total load on any overcurrent device located in a panelboard shall not exceed _____ of its rating where in normal operation the load will continue for 3 hours or more ( PEC 3.84.3.4(d) )

a)

80%

b)

125 %

c)

.70%

d)

50%

45.

Two metals of different materials shall not be joined together in order to avoid the _______ action (PEC 3.46.1.3)

a)

rusting

b)

galvanic

c)

reverse

d)

corrosion