NCCER TEST 2 Flashcards
In a guardrail system, the guardrails can be made of any of the following EXCEPT:
A. Pipe
B. Chain
C. Ropebanding
D. Cable
Ropebanding
If the potential across the circuit is 48 volts and the current is 5 amps the resistance of the circuit is :
A. 4.8 ohms
B.9.6 ohms
C. 48 ohms
D. 96 ohms
9.6 ohms
A UL listed rod type grounding electrode must have e a MINIMUM length of :
A. 6 “
B. 8 “
C. 10 “
D. 20 “
8 “
What is the MNIMIUM number of overload sensing units required for all three phase motors?
A) 0
B) 1
C) 2
D) 3
3
In a circuit of pure capacitance, the current leads the voltage by an angle of:
A. 30 degrees
B. 45 degrees
C. 90 degrees
D. 180 degrees
90 degrees
The standard unit for measuring the cross-sectional area of wire is the :
A. Circular mil.
B. Square mil.
C. Round mil.
D. Radial mil.
Circular mil.
The drawing scale is MOST likely to be found in which of the following drawing locations?
A. The lighting fixture schedule
B. The symbol list
C. The drawing title block
D. The power riser diagram
The drawing title block
The length of bare copper conductor is a ground ring MUST be buried no less than 2.5’ below grade and with a length of at least:
A. 10ft
B. 20ft
C. 25ft
D. 50ft
20ft
When installing heating cables for anti-icing systems, cable pattern should be in a :
A. Cris-cross
B. Vertical zig-zag
C. Circular
D. Serpentine
Serpentine
An auxiliary holding contact (seal-in) on a NEMATODE starter is indicated by the terminal marking:
A. 13 & 14
B. 2 & 3
C. T1 & T2
D. A1 & A2
A1 & A2
The Neutral bus in a sub panel:
A. Is boded
B. Is isolated
C. Has its own ground rod
D. Terminates bare and neutral wires
Is bonded
The PEAK voltage in a nominal 120/208 VAC system is:
A. 120V
B. 170V
C. 208 V
D. 277V
208 V
THWN conductors have an outer jacket made of :
A. Thermoset
B. Teflon
C. Nylon
D. Nomex
Nylon
What is shown on a sectional drawing?
A. Cutaway view of a building
B. Top view of a building
C. Front view of a building
D. Side view of a building
Cutaway view of a building
Who is allowed to remove another electrician’s tag or lock from any valve, switch, or of equipment without proper authorization?
A. An inspector
B. No one
C. Any supervisor
D. Owner
No one
The MAIN purpose of a revision block on an electrical drawing is to:
A. Note any changes to the original drawings
B. Identify the professional engineer
C. Indicate the location of the project
D. Provide a title for the drawing
Note any changes to the original drawings
Which of the following is the classified location where combustible vapors are always present?
A. Class 1, Div 1
B. Class 2, Div 2
C. Class 2, Div 1
D. Class 3, Div 1
Class 1 Div 1
With a row 3-4” conduits and second row of 3-2” and 2-1” conduits for a angle pull box what is the minimum distance between the opposite walls of the pull box ?
A. 18”
B. 32”
C. 40”
D.48”
32”
Exposed field-routed electrical conduit SHOULD be installed so that it:
A. Is plumb and level
B. Does not come in contact with structural beams
C. Always goes over the top of product pipes
D. Only uses 3 point saddles to cross product pipes
The plumb and level
When wiring a 3-wire control push button control circuit, the auxiliary holding contact ( seal-in) is wired with teh start button in:
A. Series
B. Parallel
C. Internal
D. External
Parallel
Ferrous metal raceways, boxes, fittings, and supports must be protected against:
A. Sunlight
B. Corrosion
C. Expansion
D. Heat
Corrosion
Which of the following factors is used to control the speed of an induction motor?
A. Voltage
B. Current
C. Frequency
D. Load
Frequency
Electrical he and tools that use a regular 120-volt system MUST be 3-wire grounded UNLESS the:
A. Worker wears rubber gloves
B. Worker wears rubber gloves and stands on a rubber mat
C. Tool is double-insulated and is approved by an independent testing facility
D. Tool has a non-lockable “dead mans” trigger switch
Tool is double insulated and is approved by an independent testing facility
A conductor with 220 mils of insulation would have insulation thickeners of :
A. 0.22
B. 2.2
C. 22
D. 220
0.22
What is the purpose of sealing cable ends that are in storage?
A. To keep moisture from entering in
B. To indicate the cable has been tested
C. To prevent chemical decomposition
D. To prevent insulation breakdown
To keep moisture from entering in
Which one of the fuses is standard size according to the NEC?
A. 2
B. 3
C. 4
D. 5
3
A 1000 KVA three phase transformer has a secondary voltage of 208/120. What is the secondary full load amperage?
A. 8.33
B.2779
C. 4817
D. 8333
B. 2779
A Megometer will be used to check a cable. The electrician MUST be sure that the circuit is
A. Live and at operating voltage
B. Live and at operating amperage.
C. De-energized and locked, tagged out , and tested
D. De-energized with the cable ends taped together
De-energized and locked, tagged out, and tested D
A protective device for limiting voltage spikes by discharging or bypassing surge current is called a:
A. Circuit breaker
B. Circuit limiter
C. Surge limiter
D. Super protector
Surge limiter
What is the resultant distance between center bends for a 10in offset at a 15 degrees?
A. 14.1in
B. 19 in
C. 24.2 in
D. 38.7 in
38.7 in
What is the symbol for the SECONDARY side of a transformer?
A. H
B. O
C. P
D. X
X
The most common transformer found on an industrial site is:
A. Single phase step down
B. Threedelta-Wye
C.Three Delta - Delta
D. Three Wye-Wye
A. Single phase step down
Applications for heat tracing systems with self regulating control include those requiring a narrow operating range and:
A. Temperature sensitive fluids
B. Low viscosity compounds
C. Sleeper ate control circuits
D. Constant heat output
Temperature sensitive fluids
With a row of 3-4 conduits and second row 3-2 and 1-1 conduits on each side for a straight pull box what is the MINIMUM distance between the opposite walls of the pull box?
A. 40
B. 32
C. 8
D. 4
32”
As the mechanical load increases on a squirrel cage induction motor :
A. Toque decreases and stator current decreases
B. Torque increases and stator current decreases
C. Torque increases and stator current increase
D. Torque decreases and stator current increases
Torque decreases and stator current increase
When installing cables smaller than 4/0 in a cable tray, the allowable cable fill area must not be less than the sum of the cable:
A. Cross-sectional areas
B. Radius
C. Length
D. Diameter
Cross-sectional areas
The meter used to measure pulling tension is known as a :
A. Circuit tester
B. Wire sorter
C. Tachometer
D. Dynamometer
Dynamometer
On a push button, normally closed contacts are generally used to open a circuit to :
A. Initiate a start or on circuits function
B. Eliminate a stop light
C. Eliminate a start light
D. Intake a stop or off circuit function
Initiate a stop or off circuit function
How should heat-shrink insulators be installed?
A. The Insulator should be slipped over the connector and heat should be applied for a few seconds.
B. Heat should be applied for a few seconds before installation.
C. The insulator should be taped in place before heat is applied.
D. PVC cement should be used on the insulator before any heat is applied
The insulator should be slipped over the connector and heat should be applied for a few seconds.
The conductor used to connect the system grounded conductor or the equipment to a grounding electrode or to a point on the grounding electrode system is called a grounding;
A. Electrode
B. Electrode conductor
C. Rod conductor
D. Rod
Electrode Conductor
A material with poor electrical conduction properties is a good
A.Circuit
B. Insulator
C. Convector
D. Intensifier
Insulator
A current transformer has a ratting of 4000:5. If 2000 amps load is on the primary, the secondary output would produce ;
A. 5amps
B. 2.5amps
C. 1.25 amps
D. 1 amp
2.5 amps
A 1500 KVA three phase transformer has a secondary voltage of 480/277. What is the secondary full load amperage ?
A. 5.42
B.1806
C. 3125
D.3130
1806
A Type LB conduit body has teh cover on
A. The left
B. The back
C. The right
D. Both sides
The back
What is the purpose of lockout/tagout?
A. Start up operations
B. Slow down operations
C. Check operations
D. Prevent operations
Prevent Operations
Why should the proper rope be selected for a cable pull?
A. To minimize cost
B. To increase speed
C. To maximize safety
D. To ensure accuracy
To maximize safety
An electrician that attempts to install or remove energized fuses will be exposed to the risk of an electrical shock and an electrical
A. Charge
B. Arc
C. Impulse
D. Surge
Arc
What is the approximate developed length of a 40” radius 90’ bend? (DL= 1.57 x radius )
A. 252
B. 141
C. 126
D. 63
63
Which of the following is the classified location where combustible dust may be preset?
A. Class 1, Div 1
B. Class 2, Div 2
C. Class 2, Div 1
D. Class 3, Div 1
Class 1, Div 1
Which of the following is the classified location where combustible fibers are always preset?
A. Class 1, Div 1
B. Class 2, Div 2
C. Class 2, Div 1
D. Class 3 Div 1
Class 3, Div 1
When installing more than one ground rod, what is the MINIMUM spacing between rods?
A. 10ft
B. 8ft
C. 6ft
D. 4ft
6 ft
How does a battery produce Voltage?
A. Electromagnetism
B. Heat
C. Chemical reaction
D. Pressure
Electromagnetism
As the load decreases on a squirrel cage induction motor, its power factor:
A. Increases
B. Slows
C. Remains steady
D. Decreases
Increases
A voltage source of a circuit provides 240 volts and draws 48 amps. How much resistance is in the circuit ?
A. 5ohms
B. 20ohms
C. 25ohms
D. 50ohms
5ohms
When re-setting a circuit breaker, where should the worker stand?
A. In front
B. On the handle side
C. Below
D. In close proximity
On the handle side
What size wire is needed for a 120v circuit 215 ft long one way wiht a load of 39 amps?
A. #8
B. #6
C. #4
D.#3
6
Which of the following conductors has teh LEAST resistance?
A. #2 AWG
B. #4 AWG
C.#6 AWG
D.#1/0 AWG
1/0
What is the PRIMARY consideration in selecting the rope for a cable pull?
A. Low cost
B. Installation speed
C. Low Stretch
D. Accuracy
Low stretch
When installing 4/0 and larger cables in a cable tray width must NOT be less than th sum of the cable:
A. Cross-sectional areas
B. Radius
C. Length
D. Diameter
Diameter
Rubber personal protective insulating equipment must be marked with the appropriate voltage rating and:
A. Current rating
B. Expiration date
C. Load rating
D. Last test date
Current rating
Why should the test leads of a megger never be touched by anyone when in use
A. It could result in an electrical shock
B. Inaccurate readings may result in
C. The megger could be damaged
D. The equipment bing tested could be damaged
It could result in an electrical shock
Eight incandescent lighting fixtures are to be installed. Each fixture is 120v with a 200-watt lamp. What is the total connected load?
A. 13.3amps
B. 12.3amps
C. 11.7amps
D. 10.2amps
13.3amps you multiply 8 times 200 watts and divide it by 120v
