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On-Line Test

South Branch Career and Technical Center

Industrial and Commercial Wiring

Incomplete

Directions: 1. Read each question carefully;

2. read choices a, b, c and d;

3. select the correct answer; you may enter ONLY ONE ANSWER;

4. using your mouse, place the cursor over the "option button" to the left side of the correct answer. "Left click" the cursor. The center of the option button should become green. If it does not, please ask your instructor for assistance. After the option button becomes green, you have successfully answered the question, and you may move on to the next question.

5. When you have finished the test, please re-read and check your answers. When you feel you have done your best, go to "File" in the upper left hand side of your task bar, select the "Print" option. When the print box appears, press OK. Your completed test should begin printing.

Question 1

The maximum spacing between supports for a 2-inch rigid nonmetallic conduit is

a) 7 feet.
b) 6 feet.
c) 5 feet.
d) 3 feet.

Question 2

What is the minimum size conduit permitted for four #14 AWG TW insulated conductors?

a) 1/2" conduit
b) 3/4" conduit
c) 7/8" conduit
d) 1" conduit

Question 3

What tool is typically used to bend PVC conduit?

a) EMT bender
b) hickey
c) hot box
d) torch

Question 4

According to the NEC, what is the total number of quarter (90 degree) bends permitted between pull points in one run of rigid conduit?

a) five
b) four
c) three
d) two

Question 5

A person installing a quartz lamp MUST be careful

a) not to touch the glass.
b) not to use the lamp in a wet location.
c) to keep the lamp in a vertical position.
d) to use the lamp in an indoor fixture only.

Question 6

In the electrical trades, bonding refers to the

a)   connecting of ungrounded conductors.
b)   fastening of metal boxes to concrete.
c)   gluing of PVC pipe connections.
d)   permanent joining of metallic parts.

Question 7

What type of conductor is used to connect the service equipment enclosure to the ground rod?

a) grounded
b) ground-fault
c) grounding
d) grounding electrode

Question 8

If you are installing two ground rods, what is the minimum distance required between them?

a) 3'
b) 4'
c) 5 1/2'
d) 6'

Question 9

A conductor intended solely for grounding purposes shall be a bare conductor or color-coded

a) black
b) blue
c) green
d) red

Question 10

According to the NEC, each transformer should be marked with its

a) btu output.
b) physical size.
c) rated KVA.
d) weight.

Question 11

In a transformer, the primary-to-secondary-turns ratio is 3:1, and the primary is 600 volts. What is the secondary voltage?

a) 1200 V
b) 1800 V
c) 200 V
d) 300 V

Question 12

What transformer has its primary as part of its secondary?

a) autotransformer
b) center-tap
c) isolation
d) trhee-phase

Question 13

The high-leg of a delta transformer is identified by the color

a) blue.
b) orange
c) red.
d) white.

Question 14

The primary of a transformer is the

a) grounded side.
b) high-voltage side.
c) low-voltage side.
d) side connected to the source.

Question 15

What type of transformer is used to lower voltage?

a) auto
b) isolation
c) step-down
d) step-up

Question 16

The NEC requires supports for flexible conduit at the intervals NOT exceeding

a) 4 1/2 feet.
b) 5 1/2 feet.
c) 5 feet.
d) 6 feet.

Question 17

What is the maximum number of #12 AWG TW conductors permitted in 1"?

a) 13
b) 15
c) 19
d) 24

Question 18

What size of EMT conduit is required for four #6 AWG THW conductors?

a) 1 1/2"
b) 1 1/4"
c) 1"
d) 3/4"

Question 19

What type of metal conduit is referred to as "thin wall conduit"?

a) rigid
b) EMT
c) galvanized rigid
d) aluminum

Question 20

A steel rod used as a grounding electrode shall have a diameter of at least

a) 1/2 inch.
b) 9/16 inch.
c) 5/8 inch.
d) 3/4 inch.

Question 21

The conduit used where subject to physical abuse or extreme moisture is

a) EMT
b) aluminum
c) PVC
d) rigid metal

Question 22

Rigid non-metal conduit is more commonly known as

a) PVC.
b) IMC.
c) EMT.
d) GRC.

Question 23

The screw shell portion of a lighting fixture is attached to which of the following conductors?

a) the ungrounded conductor
b) the grounding conductor
c) the "hot" conductor
d) the grounded conductor

Question 24

The iron core of a transformer is laminated to

a) maximize voltage.
b) decrease voltage.
c) stabilize the voltage.
d) minimize heat.

Question 25

In what situation would PVC conduit be a poor choice?

a) in a corrosive atmosphere
b) to support fixtures
c) to be buried
d) to be used outdoors

Question 26

Flexible metal conduit is sometimes called

a) flex.
b) PVC.
c) EMT.
d) IMC.

Question 27

How should the white conductor switch loop be identified in a lighting circuit?

a) by using black tape or black marker
b) by adding length of the white conductor
c) by labeling the device box
d) by using black wire connectors

Question 28

What characteristic of liquid tight flexible metal conduit makes it suitable for commercial use?

a) nonmetallic inner core
b)  no temperature limitations
c)  set-screw connectors
d)  metal inner core

Question 29

Emergency power systems normally provide power to what equipment?

a) outside lights, flag pole light
b) emergency lighting, fire pumps, ventilation
c) signs, time clock
d) lights, outlets

Question 30

When checking an incandescent lighting circuit for a short using a continuity meter, the luminaries bulb should be

a) of at least 100 watt.
b) removed from the fixture.
c) left in the circuit.
d) no greater than 100 watt.

Question 31

What makes bending IMC easier than bending an equivalent size of rigid metal conduit?

a)    IMC has slightly larger outside diameter.
b)    IMC has slightly larger internal diameter.
c)    IMC has slightly smaller outside diameter.
d)    IMC has slightly smaller internal diameter.

Question 32

Some transformers are oil-filled to

a) aid in the transfer of electrons.
b) insulate the windings.
c) transfer the power.
d) step-down the voltage.

Question 33

A current transformer should never be operated when

a) the primary is disconnected.
b) the secondary is disconnected.
c) the primary is connected.
d) the secondary is connected.

Question 34

Where a grounding means does NOT exist in a receptacle enclosure, which of the following is NOT permitted?

a) to simply replace it with a grounding type receptacle
b) to replace it with another non-grounding type receptacle
c) to replace it with an identified GFCI receptacle.
d) to replace it with a grounding type receptacle fed through a GFCI.

Question 35

Aluminum conduit is available in standard sizes from

a) 3/4" to 4" diameter.
b) 3/4" to 6" diameter.
c) 1/2" to 6" diameter.
d) 1/2" to 4" diameter.

Question 36

In the figure below, the top winding of the dual-voltage transformer is connected for

a) low voltage
b) high voltage.
c) a regulated voltage.
d) a filtered voltage.

Question 37

What type of conduit is too thin to be threaded?

a) GRC
b) rigid metal
c) IMC
d) EMT

Question 38

The outer covering of liquid tight flexible metal conduit is used for

a) a moisture seal.
b) insulation.
c) a conductor.
d) identification purpose only.

Question 39

Before working on a transformer, make sure that the circuit(s) are open and locked out on

a) the primary side.
b) the secondary side.
c) both the primary and secondary side.
d) the taps.

Question 40

When power is lost, high-intensity discharge (HID) lighting goes through a period before coming back on. This period is called the

a) pre-heat period.
b) heating period.
c) cooling period.
d) standby period.

Question 41

A transformer is to be removed. Once the transformer has been isolated from all power sources, you should

a)  disconnect the primary first.
b)  disconnect the secondary first.
c)   ground out the primary and secondary.
d)   loosen the taps.

Question 42

You are asked to troubleshoot a problem in a fluorescent lighting fixture. Upon locating the fixture in question, you observe a lamp that is cycling off and on. Of the following four steps, which one would you do FIRST?

a) check photo cell orientation per manufacturer's instructions
b) measure open circuit voltage at lamp socket
c) measure line voltage at ballast input
d) visually inspect lamp for normal end-of-life failure and physical damage

Question 43

When adding a receptacle to a circuit that is protected by an existing GFCI receptacle, you should

a) add the receptacle to the "line" side of the existing GFCI receptacle.
b) add the new receptacle to the "load" side of the existing GFCI receptacle.
c) connect the new receptacle with pigtails to the existing receptacles.
d) install a designated circuit for the new receptacle.

Question 44

When emergency power is required for a dwelling, its purpose is to supply

a) attics and crawl space lights.
b) medical equipment.
c) bathroom lights.
d) appliances.

Question 45

Inducted voltage from the primary side of a transformer creates electrical energy in the secondary windings. The winding core of the transformer is made up of a material to reduce what type of unwanted currents?

a) alternating currents
b) direct currents
c) skin effect currents
d) eddy currents

Question 46

Exposed non-current carrying metal parts of transformers shall be

a) grounded.
b) isolated.
c) insulated.
d) galvanized.

Question 47

Transformers are covered in

a) NEC Article 450
b) NEC Article 318
c) NEC Article 680
d) NEC Article 800

Question 48

How long MUST a battery-powered emergency system supply the emergency load?

a) 1 1/2 hours
b) 3 hours
c) 30 minutes
d) 15 minutes

Question 49

A 40amp circuit supplying a transformer shall have what size equipment grounding conductor?

a) No. 12 copper
b) No. 10 copper
c) No. 8 copper
d) No. 6 copper

Question 50

The windings of an isolation transformer are connected

a) magnetically.
b) vertically.
c) horizontally.
d) electrically.