Review Flashcards by Steven Malthouse

What type of wire, when run in free air, can carry the most current?
A) RA-90 Aluminum
B) RA-90 Copper
C) Steel
D) Bare Copper

Bare Copper

Book 1

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What is the size of a bare conductor having occupied area of 405 mm^2
A) 450 KCM
B) 500 KCM
C) 600 KCM
D) 800KCM

600 KCM

Book 1

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What minimum length of pull box is required for a straight through pull when there is 53 trade size conduit and 78 trade size conduit entering the top of the box and leaving the bottom of the box and all the conductors are #3 AWG or larger?

A) 12”
B) 16”
C) 18”
D) 24”

24”

Book 1

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What is the maximum number of No. 8 TW wires that may be installed in a 6x6x4 pull box?

A) 36
B) 60
C) 53
D) 52

Book 1

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What wiring method do you use to wire a motor control center (MCC), the feeders are from the bottom encased in concrete?

A) AC90
B) PVC conduit with a bond
C) USEI
D) EMT

PVC conduit with a bond

Book 1

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Which secondary terminal should be grounded?

A) H1
B) H0
C) X0
D) X1

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What is the minimum radius bend permitted in a 35 mm ridgid aluminum conduit?

A) 102mm
B) 184mm
C) 210mm
D) 241mm

184

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What is the maximum voltage that can be marked as “Extra-low voltage”?

A) 30 volts
B) 25 volts
C) 120 volts
D) 48 volts

30 volts

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Where may NMD-90 copper cable be used?

A) in concrete
B) wet locations
C) damp locations
D) under carpet

Damp locations

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What is the maximum distance from a switchbox that the first clamp may be fastened to non-metallic sheathed cable?

A) 150mm
B) 100mm
C) 200mm
D) 300mm

300 mm

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The proper method of cutting the armoured covering off armoured cable is:

A) at 90 degree to the cable with a hacksaw
B) diagonally across the weave with a hacksaw
C) by breaking the weave and then using diagonal pliers
D) by pulling a cable stripper along the cable

Diagonally across the weave with a hacksaw

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Anti-short bushings are used for protection conductors in:

A) EMT
B) NMS
C) A/S
D) AC

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Which of the following type/types of cable is not suitable fkr dirext burial?

A) RA90 cable
B) TWU cable
C) AC cable
D) M1 cable

AC cable

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2 loads in parallel
R1= 40 ohms
E= 100V

A) 64 ohms
B) 16 ohms
C) 40 ohms
D) 60 ohms

60 ohms

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What is the correction factor for calculating the amperage rafing of TW wite when there are 8 current carrying eires in one conduit?

A) 70%
B) 80%
C) 90%
D) 125%

70%

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The capacitor in a single phase motor does not provide for

A) correcting the power factor
B) limiting the starting current
C) a leading current in the start winding
D) a lagging current in the run winding

D) a lagging current in the run winding

Book 1

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A step down transformer having a turn ratio of 10-1 and 110 volts across the primary will have a secondary voltage of

A) 1100 volts
B) 11 volts
C) 1.1 volts
D) 5.5 volts

B) 11 volts

Book 1

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A device for measuring the diameter of a motor shafts is

A) micrometer
B) hydrometer
C) megometer
D) microhmmeter

A) micrometer

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The overload rating for a two-horse power squirrel cage motor should be _____ percent of the full load current of the motor when the service factor is 1.15

A) 125%
B) 150%
C) 115%
D) 300%

A) 125%

Book 1

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The maximum voltage allowed between conductors in a surface metal raceway is

A) 600v
B) 250v
C) 300v
D) 125v

C) 300v

Book 1

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If an underfloor cell system is not constructed of continuous metal the most practical procedure for providing bonding would be to

A) use the neutral as a bonding conductor
B) individually bond each section of metal together
C) use the metal of cell as bond
D) pull in bonding conductors with the branch circuits

D) pull in bonding conductors with the branch circuits 12-1814(1)
Book 1

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What is the maximum cross-sectional area of an underfloor duct filled by conductors and their insulation

A) 50%
B) 40%
C) 20%
D) 75%

B) 40% 12-1714

Book 1

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If a could of a 5 ohm resistance is connected in series with two coils, 9 ohm and 18 ohm in parallel, the combined resistance in ohms is

A) 51.6 ohms
B) 5.17 ohms
C) 11 ohms
D) 37 ohms

C) 11 ohms

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The power taken by a single phase motor is 800 watts, current is 9 amps, and 120 line voltage. The motor is operating at a power factor of

A) 75%
B) 80%
C) 95%
D) unity

A) 75%. Pf=w/va 800w/(9Ax120v)

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What is used to prevent scaffolding from toppling due to high centre of gravity A) locking wheels B) cross braces C) toe planks D) outriggers

D) outriggers

``` A point in the wiring system where current is taken to supply utilization equipment is called A) outlet B) switch box C) a pull box D) junction box ```

A) outlet. Section 0

A three phase supply may be obtained by using only two transformers if A) a star connection is used B) a delta connection is used C) an open delta connection is used D) a centre-tapped closed delta is used

C) an open delta connection is used Cec pocket book Book 1

The speed of a two pole motor with 4% slip connected to a 60 cycle source is A) 3456 rpm B) 3600 rpm C) 7200 rpm D) 6912 rpm

A) 3456 rpm. 120x60/2 =3600 rpm with 4% slip Book 1

Bare neutral service conductors can be used if the following condition is met A) conductor is made of copper and direct buried B) conductor is made of aluminum and run in EMT C) conductor is made of aluminum and run in rigid PVC conduit underground D) conductor is made of copper and installed in rigid metal conduit

D) conductor is made of copper and installed in rigid metal conduit 6-308 Book 1

When connecting a lug to an aluminum Bus bar, which is satisfactory A) flat washer B) a locknut C) lock washer D) a conical spring washer

D) conical spring washer 12-118(5) | Book 1

A fibre optic cable has no signal at the receiving, what is the likely cause A) cable kinked B) voltage drop C) light generator faulty D) cable buried too deep

A) cable kinked

The maximum voltage drop on 600 volt branch circuit conductors is A) 30v B 18v C) 7.2 v D) 12v

D) 12v. 8-102(1a)

The functions of grease in the bearings of an electrical motor is to A) protect the shaft of the motor B) reduce heat from mechanical friction C) allow the motor to run smoother D) protect the windings from arching

B) reduce heat from mechanical friction

Line 1, 120v 3A Line 2, 120v 8A Share neutral, and it breaks. What is the new voltage of line 1 A) 120v B) 240v C) 175v D) 65v

``` C) 175v R1=120v/3A=40ohm R2=120v/8A=15ohm Rt=40+15=55ohm It=240/55=4.36a V1=4.36x40=175ohm V2=4.36x15=65ohm ```

Do logic symbol stuff

What minimum depth is required when burying underground DC wiring for catholic protection A) 600mm B) 450mm C) 300mm D) 200mm

D) 200mm 80-002(1b)

The minimum size of a copper conductor that may be run aerially is A) no 6 awg B) no 8 awg C) no 10 awg D) no 12 awg

C) no 10 awg. 12-308(a)

What is the proper termination procedure when installing free air rated single conductors for a feeder installation with a calculated load of 400 amps A) aluminum to fibre plates B) only one aluminum plate required C) fibre to fibre plates D) aluminum to aluminum plates

D) aluminum to aluminum plates | 4-008 APP B

When preparing a trench for underground service conductors , you strike rock bottom. At what minimum depth list the conductors be entrenched into the rock? A) 0mm B) 50mm C) 100mm D) 150mm

D) 150mm. 12-012(7)

To control one light from three different places you would need A) three single like switches B) two 4 way and a 3 way C) three 3 ways D) two 3 way and a 4 way

D) two 3 ways and a 4 way

If a certain sub-feeder has a resistance or .05 ohms and carries 110 amperes, the voltage drop would be A) 2.2 v B) 22 v C) 5.5v D) 55v

C) 5.5 v. .05 ohm x 110a

The holding contacts of a magnetic switch A) are in series with the stop buttons B) are in parallel with the stop button C) are connected across the holding coil D) are in series with the start button

A) are in series with the stop buttons

The combined electrical resistance of a parallel circuit is A) less than the resistance of any single device in the circuit B) equal to the resistance of the largest device in the circuit C) more than the resistance of an single device in the circuit D) equal to the resistance of the smallest device in the circuit

A) less than the resistance of any single device in the circuit

While working at a motor control centre, a 208v magnetic started for. 15hp motor is humming louder than the adjacent starters. Which component requires repair A) overloads B) shading coil C) contractor coil D) main contacts

B) shading coil

Service conduit connected to an underground supply system shall be sealed with a suitable compound to prevent A) inductive reactance B) the entrance of moisture C) electrolytic action D) galvanic action

B) the entrance of moisture 6-300(4)

Electrical equipment installed in a zone 1 hazardous location shall require which equipment protection level (EPL) A) EPL Dc rated B) EPL Db rated C) EPL Gb rated D) EPL Gc rated

C) EPL Gb rated 18-002 18-100(b) T18

Soldering as defined in the code A) means the use of fusible metals B) may be done with a powder mixed with an adhesive vehicle or liquid C) includes the use of patented type solder D) means copper welding by the thermos process

A) means the use of fusible metals

When selecting overload for a 460v 200hp motor with 1.1 service factor using 300:5 current transformers, what is the required rating A) 240A B) 276A C) 4.6A D) 4.0 A

C) 4.6A

When installing extra-low-voltage cable lighting systems, the y insulated conductors shall be installed at what minimum distance from the floor A) 2m B) 2.1m C) 2.2m D) 2.3m

C) 2.2m

A “circuit breaker” as defined in the Canadian electrical code is A) an automatic electro-mechanical device designed to trip on short circuit or overload B) Amy electro-mechanical device which opens a circuit under overload C) is always thermally operated D) a device designed to open and close a circuit by automatic means

A) an automatic electro-mechanical device designed to trip on short circuit or overload

Three way switches may be connected only in A) the infused conductor B) the three wire system C) the grounded circuit conductor D) the ungrounded circuit conductor

D) the ungrounded circuit conductor

12460v to 4170v Auto transformer is connected in A) delta delta B) delta y C) y delta D) y y

A) delta delta

A motor operating a bandsaw or planner should be controlled by a device which provides A) low voltage protection B) undervoltage control C) three wire control D) all the above

D) all the above. 28-400 APP B

What is another term for root mean square A) peak value B) average value C) instantaneous value D) effective value

D) effective value

Where exit lights are required they shall be protected by A) double pole switch accessible to the public B) and automatic transfer switch accessible only to authorized persons C) an overcurrent device coloured red and lockable in the on position D) an over current device accessible only to authorized persons

D) an over current device accessible only to authorized persons 46-208(2)

Switches and red pilot lights are required by the code for A) furnace controls B) smoothing iron in tailor shops C) infra-red lamps D) all portable resistance devices

B) smoothing iron in tailor shops | 26-748(a)

Every emergency electrical system shall be tested at least A) once a year B) once a month C) once a week D) once a day

B) once a month | 46-102(1)

The number of #12 awg conductors permissible in a 245ml standard octagon box A) 14 B) 12 C) 10 D) 8

D) 8 | 12-3034(2) T23

Instrument transformers used in connection with meters and installed where accessible to unauthorized persons must A) be installed in a metal enclosure B) be grounded to service switch boxes C) have conspicuously posted, suitable warning signs D) be placed a minimum of 1.5 meters above the floor

A) be installed in a metal enclosure | 6-404(1)

What type of single phase motor would best be suited to be used for a domestic refrigerator A) universal B) split phase C) shaded pole D) capacitor start

D) capacitor start

Armoured or non-metallic sheathed cable must be supported or secured within A) 150mm of every outlet box B) 250mm of every outlet box C) 300mm of every outlet box D) 600 mm of every outlet box

C) 300 mm of every outlet box 12-540(1a) 12-618

An ohmmeter is connected across a discharged capacitor and the needle stabilizes at approximately 100 kilo ohms. The capacitor is A) leaky B) shorted C) good D) none of the above

A) leaky Shorted=0 Good= infinity or open

Non-metallic and armoured cable must be supported or fastened to the building at least every A) 750mm B) 1.0m C) 600mm D 1.5m

D) 1.5 m 12-510(1b) 12-618

Calculate the number of turns on the secondary side of this transformer Primary, 8A, 175 turns Secondary, 2.8A, ?turns A) 850 turns B) 600 turns C) 500 turns D) 450 turns

C) 500 turns 8A/2.8A. X 175 turns

A 75KVA outdoor, pole mounted transformer is usually cooled by means of A) air B) refined mineral water C) distilled water D) ionized water

B) refined mineral water

Which location can Multi-outlet assembly be installed A) living rooms B) bathrooms C) kitchens D) laundry rooms

A) living rooms | 12-3028(1,2)

Busways and splitters should be supported at intervals of no more than A) 150 mm B) 1.0 m C) 1.5m D) 2.0m

C) 1.5m | 12-2006(5)

Standard receptacles must be kept back from the inside walls of swimming pools a minimum distance of A) 1.5m B) 3m C) 3.5m D) 4m

A) 1.5m. Gfci is NeMA standard rated

A shading coil in a magnetic switch is intended for A) maintaining the switch in closed position B) reduce arching C) reduce chattering D) make it quicker acting

C) reduce chattering

The minimum length of tap conductors required from a recessed incandescent light to a box is A) 150m B) 450mm C) 1.5m D) 2.0m

B) 450mm | 30-910(3)

If a 130 volt rated incandescent lamp is used on a 110 volt supplier which if the following would increase A) lamp efficiency B) lamp intensity C) lamp heat D) lamp life

D) lamp life

At what height above the floor level must a readily accessible light fixture have a protecting guard installed A) 2m B) 2.1m C) 2.2m D) 2.5m

A) 2m | 30-314(1)

An atom that has lost or gained electrons A) is negatively charged B) he a positive charge C) Is said to be ionized D) becomes electrically neutral

C) is said to be ionized

The amperage on the neutral of a 3 wire 120-240 volt feeder which Carrie’s 1200 watts on one side and 6000 watts on the other side is A) 60A B) 50A C) 40A D) 20A

C) 40A (6000w/120v)-(1200w/120v)=40A

In a parallel circuit containing a 4ohm and 5ohm resistor, the current flow is A) highest through the 4ohm resistor B) lowest through the 4ohm resistor C) highest through the 5ohm resistor D) equal through all the two resistors

A) highest through the 4ohm resistor

The root means square value is also known as the A) average peak B) peak value C) instantaneous value D) effective value

D) effective value

What two quantities comprises the total power of an AC circuit A) apparent power and reactive power B) true power and reactive power C) apparent power and power factor D) true power and power factor

B) true power and reactive power

What is the minimum amount of screened sand or earth required in an underground trench A) 6mm B) 75mm C) 150mm D) 150mm plus overall cable diameter

D) 150mm plus overall cable diameter | 12-012(4)

A DC generator is a rotating machine that converts A) electrical energy to mechanical energy B) mechanical energy to electrical energy C) low mechanical energy to a higher level of mechanical energy D) low electrical energy to a higher level of electrical energy

B) mechanical energy to electrical energy

The centrifugal switch in a single phase motor serves the purpose of A) opening the start winding when the motor has almost reached running speed B) starting the motor when you turn the shaft manually C) allowing the running winding to start after the motor is turning D) acting as a governor after the motor is turning

A) opening the start winding when the motor has almost reached running speed

The largest manually started motor that can be used without overload protection on a branch circuit having over current protection of 15A is A) 3/4 HP B) 1HP C) 1 1/2 HP D) 2 HP

B) 1 HP | 28-308(a)

Where the rating or setting of an overcurrent device will not permit a motor to start, the maximum percentage of full load current that the fuse rating on a branch circuit feeding a squirrel cage motor shall be permitted to be increased to A) 175% B) 225% C) 300% D) 400%

D) 400% | 28-200(4ai) (4ci)

An isolating switch for a single motor shall have a minimum current rating of A) 115% of FLC B) 150% of FLC C) 100% of FLC D) 135% of FLC

A) 115% of FLC | 28-602(3A)

A safety precaution to follow when using a potential transformer is to A) ground the secondary B) ground the primary C) insulate the high current limit D) connect it in series with the line

A) ground the secondary

The protector grounding conductor for communications systems shall not be smaller than A) No.12 awg B) No. 16 awg C) No. 14 awg D) No. 20 awg

C) No. 14 awg | 60-704(b) T59

A carbon resistor colour coded red, blue, green, and gold would indicate a tolerance of A) 2% B) 5% C) 10% D) 20%

B) 5%

What is the maximum wattage of 240V rated baseboards heaters permitted on an individual single-phase branch circuit in a residential dwelling with a 120/240, 1phase distribution A) 7200 watts B) 5760 watts C) 3600 watts D) 1440 watts

B) 5760 watts 62-114(2) & 62-114(6b) & 8-100 30Ax80%x240= 5760 watts

The drawings most often used in maintenance work are A) master electrical drawings and schematics B) schematics and wiring diagrams C) wiring diagrams and isometric drawings D) isometric drawings and schematics

B) schematics and wiring diagrams

The type of diagram that is consulted to find location and interconnection of parts is called a A) schematic diagram B) master diagram C) wiring diagram D) ladder diagram

C) wiring diagram

The shock factor of electricity is dependant on the amount of A) resistance B) voltage C) current D) all the above

D) all the above

Review Flashcards

(90 cards)