wayground logo

Free Printable Worksheets

Font size

S
M
L
XL
Worksheets

NOCTI: Electrical Review #3

Total questions: 178

Worksheet time: 2hrs 48mins

Name
Class
Date
1.

What is the primary reason for locking out and tagging out circuits before working on them?

a)

To prevent accidental machine operation

b)

To improve the efficiency of the work

c)

To check the functionality of the circuit

d)

To increase the voltage in the circuit

2.

Which of the following is NOT a recommended safety practice when working with electrical installations?

a)

Using insulated tools

b)

Wearing rubber gloves and boots

c)

Working on live circuits

d)

Keeping the work area dry

3.

When installing a new electrical outlet, what is the first step?

a)

Connect the wires to the outlet

b)

Turn off the power to the circuit

c)

Cut the wires to the appropriate length

d)

Test the outlet with a voltage tester

4.

Which tool is essential for troubleshooting a circuit that repeatedly blows fuses?

a)

Hammer

b)

Multimeter

c)

Screwdriver

d)

Pliers

5.

What does it mean if a circuit breaker keeps tripping?

a)

The circuit is perfectly fine

b)

There is likely an overload in the circuit

c)

The circuit breaker is of high quality

d)

The electrical panel is outdated

6.

According to the National Electrical Code (NEC), what is the minimum allowable wire size for most household circuits?

a)

18-gauge

b)

14-gauge

c)

12-gauge

d)

16-gauge

7.

What must be done when a wiring installation does not comply with local electrical codes?

a)

It must be left as is

b)

It must be reported to the authorities

c)

It must be corrected to meet the standards

d)

It must be inspected more frequently

8.

Why is it important to ensure all connections are tight during an installation?

a)

To prevent energy efficiency

b)

To reduce the risk of fire

c)

To increase the resistance in the circuit

d)

To make the installation look neat

9.

What is the best practice for ensuring that an electrical panel is safe to work on?

a)

Check that all breakers are in the "on" position

b)

Ensure the panel is free of dust and debris

c)

Verify that the main breaker is turned off

d)

Label all circuits accurately

10.

In a parallel circuit, if one bulb burns out, what happens to the other bulbs?

a)

All other bulbs will also burn out.

b)

All other bulbs will become brighter.

c)

All other bulbs will stay lit at the same brightness.

d)

All other bulbs will turn off but not burn out.

11.
What will happen if one light bulb is removed from this circuit?
a)
The other bulbs will go out.
b)
The other bulbs will stay on
c)
The other bulbs will get dimmer.
d)
The battery will become stronger.
12.

What is the unit of voltage?

a)

volts

b)

watts

c)

amps

d)

ohms

13.

What is the unit of resistance?

a)

ampere

b)

watt

c)

ohm

d)

volt

14.

What voltage is necessary to produce a current of 200 amperes through a resistance of 100 Ω?

a)
100 volts
b)
20000 volts
c)
1000 volts
d)
500 volts
15.

What resistance would produce a current of 120 amps from a 6-V battery?

a)
0.5 ohms
b)
1 ohm
c)
10 ohms
d)
0.05 ohms
16.

What tool is used to strip insulation from electrical wires?

a)

Hammer

b)

Pliers

c)

Screwdriver

d)

Wire strippers

17.

What is the purpose of leaving a service loop of extra wire at outlet or switch boxes?

a)

To connect additional devices

b)

To allow for future adjustments or repairs

c)

To reduce the amount of wire needed

d)

To make the wiring look neater

18.

Required by code in potentially wet locations. (stops the current) when short circuit occurs.

a)

Three way switch

b)

Double pole switch

c)

GFCI

d)

Single pole switch

19.
a)
Motor
b)
Mouse
c)
Ground
d)
Fuse
20.

Match the following

a)

1.

motor

b)

2.

transformer

c)

3.

junction box

d)

4.

ground connection

e)

5.

lighting panel

21.

What electrical symbol is this?

a)

smoke detector

b)

storm drain

c)

phone jack

d)

dishwasher

22.

What electrical symbol is this?

a)

smoke detector

b)

220V outlet

c)

110V outlet

d)

light switch

23.

What electrical symbol is this?

a)

phone

b)

fan

c)

light

d)

smoke detector

24.

Where would you need this type of outlet?

a)

laundry

b)

bathroom

c)

garage & outside

d)

all of the above

25.

This is a GFI Outlet:

a)

true

b)

false

26.

Match the following

a)

1.

Controls 1 path

b)

2.

Controls 2 paths, one at a time

c)

3.

Controls 2 paths at same time

d)

4.

Controls 4 paths, 2 at a time

e)

5.

Controls multiple paths, 1 at a time.

27.

Label the symbols

a)

Ground

b)

Switch

c)

Battery

d)

Fuse

e)

Relay

f)

Motor

1
2
3
4
5
6
1)
2)
3)
4)
5)
6)
28.

Identify the picture.

a)

Junction Box

b)

Weatherproof duplex receptacle outlet

c)

Ceiling Fixture

d)

Single Receptacle outlet

29.

Identify the picture.

a)

Drop cord Fixture

b)

Ceiling Fixture

c)

Single-pole switch

d)

Junction Box

30.

Identify the picture.

a)

Three-way switch

b)

Single-pole switch

c)

Double-pole switch

d)

Four-way switch

31.

Identify the picture.

a)

Triplex receptacle outlet

b)

Single receptacle outlet

c)

Ceiling fixture

d)

Duplex receptacle outlet

32.

Identify the picture.

a)

Three-way switch

b)

Double-pole switch

c)

Weatherproof switch

d)

Low-voltage switch

33.

Identify the picture.

a)

Junction box

b)

Fluorescent fixture

c)

Telephone

d)

240-volt receptacle outlet

34.

Identify the picture.

a)

GFCI receptacle outlet

b)

Weatherproof duplex receptacle outlet

c)

Triplex receptacle outlet

d)

Single receptacle outlet

35.

What is the name of this component?

a)

fuse

b)

cell

c)

wire

d)

bell

36.

What is the name of this component?

a)

fuse

b)

cell

c)

motor

d)

lamp

37.

The government organization whose purpose is to set and enforce worksite safety and health standards is:

a)

OSHA (Occupational Safety Health Administration)

b)

EEOC (Equal Employment Opportunity Commission)

c)

NLRB (National Labor Relations Board)

d)

OPM (Office of Personnel Management)

38.

In residential structures, GFCI is required in

a)

living rooms

b)

bedrooms

c)

dining rooms

d)

kitchens

39.

What article in the National Electrical Code covers motors, motor branch-circuit and feeder conductors and their protection?

a)

Article 430

b)

Article 440

c)

Article 450

d)

Article 500

40.

The transformer winding to which the line is connected is called the ________ winding.

a)

primary

b)

field

c)

voltage

d)

current

41.

The winding ratio of a ________ transformer has a rating of 3:1 winding ratio.

a)

neutral

b)

step-down

c)

step-up

d)

control

42.

What is the resistance total for a 560 ohm, 1 k ohm, and a 3.3 k ohm resistor in series?

a)

323.76 ohms

b)

1,327 ohms

c)

4,860 ohms

d)

13,860

43.

A _______ fire extinguisher should be used on an electrical fire.

a)

Class A

b)

Class B

c)

Class C

d)

Class D

44.

What safety practice is used to prevent equipment from being energized?

a)

pump

b)

lockout/tagout

c)

remove fuse

d)

off switch

45.

An ohmmeter is used to measure

a)

current

b)

voltage

c)

resistance

d)

power

46.

Which of the following is used to measure a current?

a)

ohmmeter

b)

ammeter

c)

wattmeter

d)

voltmeter

47.

In an AC circuit, if resistance remains the same and voltage is doubled, then current

a)

reduces by half

b)

remains the same

c)

is doubled

d)

increases fourfold

48.

If the voltage source supplies 260 volts and the resistance measures 5 ohms, the current is

a)

28 amps

b)

36 amps

c)

48 amps

d)

52 amps

49.

In the DC circuit below, if R5 burns open, the total current

a)

increases

b)

decreases

c)

remains the same

d)

goes to zero

50.

Every digital multimeter can measure three basic things - current, voltage, and

a)

capacitance

b)

sinusoidal

c)

resistance

d)

pulse

51.

Where is the resistor located on this diagram?

a)

A

b)

C

c)

D

d)

B

52.

The proper angle for setting up a ldder is to place the basea/an ____ of the working length of the ladder from the wall or other vertical surface.

a)

sixteenth

b)

eighth

c)

quarter

d)

third

53.

The MINIMUM amount of free wire that must be left in a workbox is

a)

2 inches

b)

4 inches

c)

6 inches

d)

8 inches

54.

Non-metallic sheathed cable must be supported ____ from every outlet or junction box.

a)

4 inches

b)

8 inches

c)

12 inches

d)

16 inches

55.
a)

Pliers

b)

wire strippers

c)

side cutters

d)

wire tester

56.
a)

Filing pole

b)

Wire puller

c)

Fish tape

d)

Wire Holder

57.
a)

Long pliers

b)

Needle nose

c)

Pliers

d)

Vise grib

58.
a)

Side cutters

b)

Angle cutters

c)

pliers

d)

Lineman pliers

59.
a)

Lineman pliers

b)

pliers

c)

needle nose pliers

d)

side cutters

60.
a)

screwdriver

b)

Philips screwdriver

c)

Allen wrench

d)

Flat head

61.

What is the primary advantage of using LED lighting over incandescent bulbs?

a)

LEDs have a shorter lifespan.

b)

LEDs generate more heat.

c)

LEDs are less energy-efficient.

d)

LEDs have a longer lifespan and are more energy-efficient.

62.

How does a diode function in an electrical circuit?

a)

By allowing current to flow in both directions equally

b)

By converting electrical energy into light

c)

By storing electrical energy for later use

d)

By allowing current to flow in only one direction

63.

What is the primary function of a fuse in an electrical circuit?

a)

To increase the current flow

b)

To decrease the resistance

c)

To interrupt the circuit in case of excessive current

d)

To convert AC to DC

64.

What safety precautions should be followed when working with electricity?

a)

Wearing sunglasses

b)

Swimming while working with electricity

c)

Using wet hands

d)

Follow safety precautions such as wearing PPE, grounding equipment, avoiding water, using insulated tools, and turning off power.

65.

Explain the concept of electrical power and how it is calculated.

a)

Electrical power is not related to voltage or current.

b)

Electrical power is measured in volts.

c)

Electrical power is calculated by multiplying the voltage (V) across the circuit by the current (I) flowing through it using the formula P = V * I.

d)

Electrical power is calculated by dividing the voltage by the current.

66.

What is the role of a transformer in electrical circuits?

a)

To convert electrical energy into heat

b)

To transfer electrical energy between circuits through electromagnetic induction and adjust voltage levels.

c)

To store electrical energy in batteries

d)

To generate electricity from mechanical energy

67.

What is the purpose of a ground wire in an electrical system?

a)

To prevent electrical current from flowing through the system

b)

To regulate the voltage in the system

c)

To increase the resistance in the circuit

d)

To provide a path for excess electrical current to flow into the ground

68.

What does AC stand for in electrical terms?

a)

Amplified Current

b)

Alternating Current

c)

Analog Converter

d)

Advanced Circuit

69.

In general, a beginning tradesperson with little or no experience in the field

a)

A class 5 technician

b)

An apprentice

c)

A laborer

d)

A journeyperson

70.

The NEC requires two grounding electrode rods to be placed in the ground a minimum of ____ apart

a)

2 feet

b)

3 feet

c)

4 feet

d)

6 feet

71.

What is the minimum distance between straps on service entrance conductors?

a)

12 inches

b)

30 inches

c)

4 1/2 feet

d)

6 feet

72.

What is the MINIMUM working space width required at the service panel?

a)

16 inches

b)

24 inches

c)

30 inches

d)

36 inches

73.

Service conductors should have a clearance of not less than ___ from doors and windows designed to open

a)

12 inches

b)

16 inches

c)

24 inches

d)

36 inches

74.

According the the NEC, a continuous load is one where the maximum current is expected to continue for ___ or more hours

a)

3 hours

b)

4 hours

c)

6 hours

d)

8 hours

75.

The MINIMUM clearance of ___ must be maintained between overhead service conductors and residential driveways

a)

10 feet

b)

12 feet

c)

14 feet

d)

16 feet

76.

The safety feature that completes an electric current and carries the current safely away

a)

direct current

b)

circuit breaker

c)

grounding

d)

alternating current

77.

Which choice best identifies the hazard?

a)

The cabinet is colored light blue.

b)

Nothing. It looks good to me.

c)

Unattended fire extinguisher

d)

Locked cabinet door

78.

When the insulation on an extension cord is damaged, you should:

a)

Use duct tape to repair it

b)

Do nothing

c)

Remove it from service immediately

d)

Touch the conductors to see it they are energized

79.

A “Lock-out/Tag-out” system is used to:

a)

Keep people from stealing your tools

b)

Prevent accidental contact with electric current

c)

Keep you from completing the work

d)

Another step to your work

80.

Define direct current (dc).

a)

Current that reverses direction periodically

b)

Current that flows in one direction only

c)

Current that varies in magnitude

d)

Current that flows in multiple directions

81.

What is the term used to describe the number of cycles per second in an alternating current?

a)

Amplitude

b)

Frequency

c)

Wavelength

d)

Velocity

82.

Who publishes the NEC?

a)
National Fire Protection Association (NFPA)
b)
American Red Cross
c)
American Heart Association
d)
Occupational Safety and Health Administration (OSHA)
83.

How many chapters in the NEC?

a)
15
b)
20
c)
10
d)

9

84.

Match the Chapter/Article to in topic

a)

NEC Article 100

1.

Common definitions

b)

Chapter 2

2.

Wiring & Protection

c)

NEC Article 200

3.

Use & ID of grounded conductors

d)

Chapter 3

4.

Wiring Methods & Materials

e)

NEC Article 300

5.

General requirements wiring methods

85.

What article in the National Electrical Code covers motors, motor branch-circuit, and feeder conductors and their protection?

a)

Article 421

b)

Article 930

c)

Article 430

d)

Article 429

86.

What article in the National Electrical Code covers Wiring Methods and Materials?

a)

Chapter 2

b)

Chapter 3

c)

Chapter 4

d)

Chapter 5

87.

How often is the NEC updated?

a)

Every year

b)

Every two years

c)

Every three years

d)

Every five years

88.

Mandatory and permissive rules are defined in

a)

NEC article 90

b)

NEC article 100

c)

NEC article 110

d)

NEC article 200

89.

How far should outlet receptacles be from a hot tub or spa?

a)

Less than 3 feet

b)

Between 3 and 6 feet

c)

Between 6 and 9 feet

d)

More than 9 feet

90.

Is underground wiring allowed under a pool or spa?

a)

Yes

b)

No

91.

The term approved means to be

a)

a. listed by a Nationally Recognized Testing Laboratory (NRTL)

b)

b. acceptable to the National Electrical Code

c)

c. acceptable to the architect or engineer designing the job

d)

d. acceptable to the authority having jurisdiction

92.

The black-colored common terminal on a three-way switch should always have a __________ insulated wire connected to it.

a)

white

b)

black

c)

red

d)

any colored insulated wire is permitted

93.

Which type of outlet is required by code for kitchen countertops?

a)

Standard outlet

b)

GFCI outlet

c)

AFCI outlet

d)

USB outlet

94.

Which of the following is a characteristic of a synchronous motor?

a)

It requires a commutator

b)

It is only used in small applications

c)

It runs at a constant speed

d)

It can operate at variable speeds

95.

What is the function of a commutator in an electric motor?

a)

To provide insulation to the motor

b)

To decrease the resistance in the circuit

c)

To increase the speed of the motor

d)

To reverse the direction of current in the armature windings

96.

What is the function of a thermal overload relay in a motor control circuit?

a)

To increase the motor's speed

b)

To reduce the motor's size

c)

To convert AC to DC

d)

To protect the motor from overheating

97.

Which of the following is a characteristic of a three-phase induction motor?

a)

It is used only in low-power applications

b)

It requires a commutator

c)

It has a high starting torque

d)

It operates on a single-phase power supply

98.

Which conduit is the thickest and needs to be threaded

a)

EMT

b)

IMT

c)

RMC

d)

PVC

99.

Finished conduit is produced in nominal ____ lengths

a)

1 foot

b)

3 foot

c)

5 foot

d)

10 foot

100.

If the lighting requirement is 3 volt-amps per square foot and a home is 40 feet by 90 feet, the required volt-amps for lighting would be

a)

7,200 volt-amps

b)

8,100 volt-amps

c)

10,800 volt-amps

d)

11,700 volt-amps

101.

What is the role of brushes in an electric motor?

a)

To clean the commutator

b)

To maintain electrical contact with the commutator

c)

To lubricate the motor

d)

To cool down the motor

102.

How can the torque of an electric motor be increased?

a)

By using a lighter armature

b)

By adding more loops to the armature

c)

By using a smaller battery

d)

By using fewer wires

103.

What is the rotor in an electric motor?

a)

The outer casing of the motor

b)

The wires inside the motor

c)

The battery connection

d)

The part that spins

104.

What is the stator in an electric motor?

a)

The part that spins

b)

The switch that controls the motor

c)

The part that doesn't move

d)

The battery that powers the motor

105.

What is the purpose of a commutator in an electric motor?

a)

To cool down the motor

b)

To automatically switch the direction of current

c)

To increase the motor's power

d)

To reduce the motor's speed

106.

What does lock rotor current means ?

a)

Problem cause by defective motor

b)

Maximum starting torque of an electric motor

c)

The relation between working current and theoretical current of a motor

d)

The current inrush pulled by a motor at start up

107.

A motor is rated at 1500 RPM. What does RPM stand for?

a)

Revolutions per minute

b)

Rotations per meter

c)

Resistance per meter

d)

Rotations per minute

108.

What is the first step in troubleshooting a motor that won't start?

a)

Replace the motor

b)

Check the power supply

c)

Inspect the motor windings

d)

Test the motor's speed

109.

Using Ohm's Law, calculate the voltage across a motor with a resistance of 10 ohms and a current of 3A.

a)

10V

b)

20V

c)

30V

d)

40V

110.

A motor has a resistance of 5 ohms and is connected to a 20V power supply. What is the current flowing through the motor?

a)

2A

b)

4A

c)

5A

d)

6A

111.

If a motor has a voltage rating of 240V and a current rating of 10A, what is the power consumption of the motor?

a)

1200W

b)

2400W

c)

4800W

d)

600W

112.

What is the primary purpose of a motor control circuit?

a)

To increase the speed of the motor

b)

To start, stop, and regulate the motor's operation

c)

To convert AC to DC

d)

To reduce the motor's size

113.

What is the name of the coil of wire around a soft iron core used to operate

magnetic contactors and relays?

a)

Lever

b)

Plunger

c)

Solenoid

d)

Drum

114.

Which description below best matches the symbol shown?

a)

Manual operated control valve

b)

Rotary actuated control valve

c)

Motor operated control valve

d)

Diaphragm actuator control valve

115.

Symbol F in the figure provided represents a

a)

Float switch

b)

Temperature switch

c)

Pressure switch

d)

Foot switch

116.

What component identified at no. 3?

a)

Push button switch (NC)

b)

Push button switch (NO)

c)

Overload relay

d)

3 phase induction motor

117.

_________ is anything at the workplace that can potentially harms people.

a)

Accident

b)

Calculating

c)

Hazard

d)

Injury

118.

Identify the function of part number 1 from the figure shown.

a)

Protect from overload

b)

Power supply

c)

Electrical interlock

d)

Start the circuit

119.

What type of contact is this

a)

N.O. normally open

b)

N.C. normally close

120.

A_____is an electrically operated switch. It consists of a set of input terminals for a single or multiple control signals, and a set of operating contact terminals.

a)

contactor

b)

circuit breaker

c)

relay

d)

solenoid

121.

True or False. A time delay fuse only has one element.

a)
A time delay fuse has multiple elements but only one is active.
b)
True
c)
False
d)
A time delay fuse is a type of circuit breaker.
122.

True or False. A grounded neutral wire can be used as an equipment ground

a)
False
b)
Grounded neutral wires are better than equipment grounds
c)
A grounded neutral wire is always safe
d)
True
123.

Three phase power is transmitted in phases that are _____ degrees apart.

a)
90
b)
180
c)
60
d)
120
124.

A single motor used in continuous duty shall have branch circuit conductors rated at not less than _____________________ motor full load current.

a)

125%

b)

100%

c)

200%

d)

105%

125.

In motor controls, multiple start buttons are wired in (a)   .

126.

In motor controls, multiple stop buttons are wired in (a)   .

127.

Define Ohm's Law and provide the formula.

a)

V = IR

b)

R = V/I

c)

I = V/R

d)

I = R/V

128.

The National Electric Code (NEC) term "accessible" means taht an electrical box can be

a)

removed without damage to the building

b)

unlocked in an open area

c)

found with the aid of a blueprint

d)

mounted in a wall

129.

What is the MOST commonly used communication cable in residential voice/data applications?

a)

Cat 1 & 2

b)

Cat 3 & 4

c)

Cat 5e & 7

d)

Cat 13 & 15

130.

Power tools should be carried by the

a)

handle

b)

guard

c)

bit

d)

cord

131.

All power tools should be grounded and must have a 3-prong cord unless they are approved

a)

by a fellow worker

b)

by your supervisor

c)

and have a 2-prong adapter

d)

double insulated tools

132.

Which hammer is MOST commonly used by electricians?

a)

claw

b)

wedge

c)

peen

d)

dowel

133.

A drawing is scaled so that 1″ = 16′. A wall section in the scaled drawing measures 3 3/4".

What is the actual dimension of the wall?

a)

30′

b)

48′

c)

54′

d)

60′

134.

An electrician has a severe cut on his arm and is bleeding profusely. The first action is...

a)

apply direct pressure over the wound

b)

call 911 immediately and wait for help to arrive

c)

run under warm water

d)

hold the injured area below the heart if possible

135.

A lockout device positively prevents a machine from being....

a)
locked or secured
b)
turned on or off
c)
operated or energized
d)
repaired or maintained
136.

When reading blueprints, a compass rose indicates..

a)

north on the drawing

b)

proper elevation

c)

location of the electrical panal

d)

center line of the first floor

137.

A house has 7 rooms which require 48 feet of 12-2 w/ground non-metallic cable. What is the minimum quantity of 100 foot rolls that need to be ordered?

a)
3
b)
5
c)
6
d)
4
138.

On a blueprint scale of 1/8 inch = 1 foot, a 3-1/2 inch length represents ____ feet.

a)

22 feet

b)

24 feet

c)

26 feet

d)

28 feet

139.

The term used to express frequency is ______.

a)
Watt
b)
Volt
c)

Ohms

d)
Hertz
140.
The Person primarily responsible for your safety is _____________.
a)
your foreman
b)
your insructor
c)
yourself
d)
your employer
141.

A fire extinguisher labeled for use on Class A fires can also be used on Class C fires.

a)

True

b)

False

142.

You are an electrician working in a new building and you come across an installation that is not safe and is not acceptable under local electrical code. What should you do?

a)

Call the building inspector.

b)

Tell your supervisor after work.

c)

Tell your supervisor immediately

d)

Keep a close eye on it and continue your work.

143.

Which of the following is NOT true about aiding a victim of electrical shock?

a)

Shut off the power.

b)

Call 911 and provide CPR until help arrives.

c)

Use an insulator to remove the hazard if you can't shut off the power.

d)

Quickly grasp the victim and drag them away from the hazard.

144.

An electrician should use a ________ ladder when working around electrical wiring.

a)

Aluminum

b)

Wood

c)

Fiberglass

d)

Wood or Fiberglass

145.

Which of the following is a Side/ Diagonal Cutting Plier?

a)
b)
c)
d)
146.
a)

Saw

b)

Hacksaw

c)

Screwdriver

d)

Driller

147.

Which of the following picture is the needle nose pliers?

a)
b)
c)
d)
148.

In an AC circuit, if resistance remains the same and voltage is doubled, then current...

a)

remains the same

b)
will double
c)
will halve
d)
will quadruple
149.
The device that lowers our AC voltage so we can use it in our homes
a)
Transformer
b)
Rectifier
c)
Splicer
d)
Voltmeter
150.

Calculate total circuit current.

a)

1 A

b)

2 A

c)

3 A

d)

4 A

151.

Calculate total circuit power.

a)

120 W

b)

240 W

c)

480 W

d)

960 W

152.

Using the information in Figure PP1–3, calculate the voltage drop between the source and the load.

a)

10 V

b)

14.7 V

c)

18 V

d)

22 V

153.

What is the maximum volt drop allowed for lighting circuits?

a)

5%

b)

10%

c)

3%

d)

8%

154.

What color is typically used for hot wires in AC circuits?

a)

White

b)

Green

c)

Black

d)

Blue

155.

Which color indicates neutral wires in most AC circuits?

a)

Red

b)

Yellow

c)

Green

d)

White

156.

What color are ground wires usually in AC circuits?

a)

Black

b)

Red

c)

Green or bare

d)

Blue

157.

Which of the following are symbol for "Service Entrance"

a)

b)

c)

d)

158.

An electronic device runs on a 36-volt supply and takes 11 amps. What is its power?

a)

185 watts

b)

297 watts

c)

396 watts

d)

482 watts

159.

What is the function of a circuit breaker in an electrical system?

a)

To convert AC to DC

b)

To protect the circuit from overload

c)

To decrease the current

d)

To increase the voltage

160.

Which of the following is a common cause of electrical fires?

a)

Installing GFCI outlets

b)

Using LED bulbs

c)

Overloading electrical outlets

d)

Using appliances with low wattage

161.

What is the purpose of grounding in electrical installations?

a)

To provide a path for electrical current to the earth

b)

To increase the circuit's resistance

c)

To reduce the voltage

d)

To enhance the circuit's efficiency

162.

Standard fluorescent tubes are designated by a code consisting of numbers and letters. What would be the diameter of a tube with the designation F40T12CW?

a)
1.5 inches
b)
3 inches
c)
2 inches
d)
1 inch
163.

Electric utility companies supply energy to consumers measured in...

a)
ampere-hours (Ah)
b)
kilowatt-hours (kWh)
c)
joules (J)
d)
megawatt-hours (MWh)
164.

An instrument used for insulation tests is a ...

a)
oscilloscope
b)
voltmeter
c)
megohmmeter
d)
ammeter
165.

In an AC circuit containing resistance only, _____ watts of power will be dissipated when there are 25 volts and 5 amps of current.

a)
200 watts
b)
100 watts
c)
125 watts
d)
150 watts
166.

True or False. EMT may be used to support luminaries (fixtures) or other equipment.

a)
True
b)
Only for outdoor use
c)
Only for electrical wiring
d)
False
167.

Power transformers are rated in ...

a)
watts (W)
b)
volts (V)
c)
kilovolt-amperes (kVA) or megavolt-amperes (MVA)
d)
ohms (Ω)
168.

The break stations or initiating devices of a particular fire alarm system are to be wired in parallel: therefore, the break stations would have ________________ contacts.

a)
normally closed
b)
momentary
c)
latching
d)
normally open
169.

An electromagnetic device in a low-voltage system used for remote or automatic control is called a....

a)
relay
b)
switch
c)
transformer
d)
capacitor
170.

If 869 feet of conduit is required for a job, how many lengths of conduit are needed for the job?

a)
92
b)

86

c)
85
d)
87
171.

The AC voltage waveform is called a _______ wave.

a)

cosine

b)

full

c)

sinusoidal

d)

half

172.

If 689 feet of conduit is needed for a job, how many lengths of conduit are needed?

a)
69
b)
65
c)
70
d)
68
173.

According to the NEC, an apprentice may install electrical equipment....

a)

if working with a journeyman

b)

if under the supervision of a journeyman

c)

if under the supervision of a foreman

d)

without restrictions

174.

The condition that is most likely to cause a shock from electrical devices is...

a)

too much voltage

b)

overload circuits

c)

improper grounding of wiring

d)

wrong wire size

175.

Conductors installed in parallel must be at least...

a)

number-2

b)

number-4

c)

1/0

d)

2/0

176.

Bored holes through wood members must be kept a minimum of _____ from the nearest edge of the wood member.

a)
1 inch
b)

1 1/2 inches

c)
2 inches
d)

1 1/4 inches

177.

A problem with using aluminum wiring for electrical circuits is that aluminum ...

a)

is brittle and breaks easily

b)

has a high melting point

c)

has a low conductivity

d)

forms a non-conductive oxide layer

178.

Temporary outlets for general use on a construction site must be ...

a)

rainproof and totally enclosed

b)

Type-S Fuse protected

c)

GFCI protected and separated from branch circuits supplying temporary lighting

d)
GFCI protected.

Similar Resources on Wayground

Vragen over de Franse Taal

180 questions

Vragen over de Franse Taal

quiz

Worksheet

•

9th Grade

untitled

175 questions

untitled

quiz

Worksheet

•

3rd - 9th Grade

General Knowledge

174 questions

General Knowledge

quiz

Worksheet

•

9th - 12th Grade

CA0141 PT 2

183 questions

CA0141 PT 2

quiz

Worksheet

•

9th - 12th Grade

best ninjago quiz

177 questions

best ninjago quiz

quiz

Worksheet

•

KG - University

A. Building Science

180 questions

A. Building Science

quiz

Worksheet

•

12th Grade