ELETRICIAN NCCER
Which article of the NEC covers grounding? - Answer- Article 250
What is a dropout plate? - Answer- Metal plate with a curve surface for cable to follow as it passes
from the tray
All of the following are common service voltages in the United States Except: - Answer- 372/575 3-
Phase, 4-wire
What does a GFCI breaker do? - Answer- Opens a circuit to prevent operation of an electrical
device
What will happen when one or more coils in a winding are grounded? - Answer- The motor will
automatically blow fuses
eight incandescent lighting fixtures are to be installed. Each fixture is 120 volts, with a 200-whatt
lamp what is the total connected load? - Answer- 13.3 Amps
The __________must be grounded in a bussed glutter if use as the main service equipmemt -
Answer- Neutral busbar
When wall mounting cable tray, ensure that - Answer- The building structure is strong enough to
support the tray system
The purpose of sealing cable ends when reels of cable are in storage is ______________ -
Answer- to keep moisture from creeping in
The outer covering on liquid-tight flexible metal conduit is use for - Answer- A moisture seal
A good electrical connection should - Answer- Be mechanically and electrically secure
The symbol normally use for duplex - Answer- Circle with two parallel lines draw through it
Disconnecting means are covered in - Answer- NEC section 110-22
In relation to switches, the term throw refers to the - Answer- Number of internal operations that
switch can perform
A 3-phase, 4-wire, 480v service requires ________ current transformers - Answer- 3
Services conductors and equipment are covered in - Answer- NEC Article 230
The NEC required that all receptacles installed on 25 amp and 20 amp branch circuits
be__________ receptacles - Answer- Grounding
The circular mil is based on the - Answer- Cross-sectional area of the wire
,A transformer with the primary of 400 turns and a secondary of 300 turns has a - Answer- Step
down turns ratio of 4:3
Of the termination classes listed below,_____ is the only one that provides a seal against external
elements - Answer- Class 1
Unless otherwise noted, the calculations in AC circuits ______ values - Answer- Rms
When the coil turns increased the ________ - Answer- Induced voltage is increased
As the temperature surrounding a self regulating heating cable rises, the ________ - Answer-
Resistance of the polymeric core increases
The motor type that has the highest starting torque is the _________ motor - Answer- Capacitor -
start
For a given number of poles, the________ determines the speed of an AC Motor. - Answer-
Frequency
Both induction and synchronous motor operate on the principle of the rotating________field -
Answer- Magnetic
A Transformer has 200 turns in the primary, 150 turns in the secondary, and 120VAC applied to
the primary. The voltage across the secondary is - Answer- 90 Volts
The output capacity of a motor is rated in - Answer- Horsepower
The synchronous speed at witcha 4 pole, 60 Hz induction motor operates is ________ rpm -
Answer- 1800
The sine of 0 degree is - Answer- 0
In a AC circuit containing resistance only, _______ 12A will flow if the resistance is 10 ohms and
the voltage is 120V - Answer- 12A
The _____ rotor types are generally rugged - Answer- Squirrel cage
The componente labeled 7 in figure 1 is a (an) - Answer- End seal
Meters used in AC circuits indicate the_______ - Answer- Effective
Proofs tests are made at________ oF the original factory voltage - Answer- 60%
Which type of heating cable can not be cut and terminated in the field? - Answer- Mineral insulated
The secondary of a CT under load should not be opened because of______ - Answer- Induced
hight voltage
In a transformer,______ - Answer- Electromagnetic induction occurs
, When a ground rod is installed, the top of the rod must be positioned _____.grade - Answer- Flush
with or below
When making offset bends, the two kicks must be made perfectly parallel or the resulting offset will
have a ________ - Answer- Crooked bend
All of the following types of condulet may be used as a pulling point for conduit that requires a 90
degree change in direction, except_______ - Answer- C
To be effective, a grounding system must limit the voltage on the electrical system and protect it
from all of the following, except ______ - Answer- Undervoltage conditions
What is the most common service use in a temporary power panel? - Answer- 120/240 volt, 1-
phase, 3-wire
What are the 2 most common types of overcurrent protective devices? - Answer- Circuit breakers
and fuses
What instrument is use to perform an insulation resistance test on a 480 volt motor winding? -
Answer- Megohmmeter
What is a seal installed in a run of conduit in a class I location? - Answer- Prevent the passage of
explosive gases in the conduit
Which of the following is the correct formula for OHM's law? - Answer- I=E/R
Which of the following testing instruments operated on the current transformer principle - Answer-
Clamp-on ammeter
A drowning showing a point A to point B hookup of conductors is called a - Answer- Wiring
diagram
What does HOA usually mean in a motor control circuit - Answer- Hands of automatic
A120/208 Volt feeder consist of an 800 ft run of 500 kcmil aluminum wire in conduit. This feeder
has 5% voltage drop. What will the phase-toPhase voltage be at the load end - Answer- 197.60
volts
What is voltage? - Answer- electromotive force
What is the standard wire size system used in the United States? - Answer- AWG
A switch labeled "AL-CU" can be use with what type of wire? - Answer- Aluminum Copper and
copper clad aluminum
What type of conduit fitting is usually placed in the middle of a long run of rigid metal conduit to
provide access for pulling wire - Answer- C
What is the largest size of aluminum rigid conduit couplings? - Answer- 6"
Which article of the NEC covers grounding? - Answer- Article 250
What is a dropout plate? - Answer- Metal plate with a curve surface for cable to follow as it passes
from the tray
All of the following are common service voltages in the United States Except: - Answer- 372/575 3-
Phase, 4-wire
What does a GFCI breaker do? - Answer- Opens a circuit to prevent operation of an electrical
device
What will happen when one or more coils in a winding are grounded? - Answer- The motor will
automatically blow fuses
eight incandescent lighting fixtures are to be installed. Each fixture is 120 volts, with a 200-whatt
lamp what is the total connected load? - Answer- 13.3 Amps
The __________must be grounded in a bussed glutter if use as the main service equipmemt -
Answer- Neutral busbar
When wall mounting cable tray, ensure that - Answer- The building structure is strong enough to
support the tray system
The purpose of sealing cable ends when reels of cable are in storage is ______________ -
Answer- to keep moisture from creeping in
The outer covering on liquid-tight flexible metal conduit is use for - Answer- A moisture seal
A good electrical connection should - Answer- Be mechanically and electrically secure
The symbol normally use for duplex - Answer- Circle with two parallel lines draw through it
Disconnecting means are covered in - Answer- NEC section 110-22
In relation to switches, the term throw refers to the - Answer- Number of internal operations that
switch can perform
A 3-phase, 4-wire, 480v service requires ________ current transformers - Answer- 3
Services conductors and equipment are covered in - Answer- NEC Article 230
The NEC required that all receptacles installed on 25 amp and 20 amp branch circuits
be__________ receptacles - Answer- Grounding
The circular mil is based on the - Answer- Cross-sectional area of the wire
,A transformer with the primary of 400 turns and a secondary of 300 turns has a - Answer- Step
down turns ratio of 4:3
Of the termination classes listed below,_____ is the only one that provides a seal against external
elements - Answer- Class 1
Unless otherwise noted, the calculations in AC circuits ______ values - Answer- Rms
When the coil turns increased the ________ - Answer- Induced voltage is increased
As the temperature surrounding a self regulating heating cable rises, the ________ - Answer-
Resistance of the polymeric core increases
The motor type that has the highest starting torque is the _________ motor - Answer- Capacitor -
start
For a given number of poles, the________ determines the speed of an AC Motor. - Answer-
Frequency
Both induction and synchronous motor operate on the principle of the rotating________field -
Answer- Magnetic
A Transformer has 200 turns in the primary, 150 turns in the secondary, and 120VAC applied to
the primary. The voltage across the secondary is - Answer- 90 Volts
The output capacity of a motor is rated in - Answer- Horsepower
The synchronous speed at witcha 4 pole, 60 Hz induction motor operates is ________ rpm -
Answer- 1800
The sine of 0 degree is - Answer- 0
In a AC circuit containing resistance only, _______ 12A will flow if the resistance is 10 ohms and
the voltage is 120V - Answer- 12A
The _____ rotor types are generally rugged - Answer- Squirrel cage
The componente labeled 7 in figure 1 is a (an) - Answer- End seal
Meters used in AC circuits indicate the_______ - Answer- Effective
Proofs tests are made at________ oF the original factory voltage - Answer- 60%
Which type of heating cable can not be cut and terminated in the field? - Answer- Mineral insulated
The secondary of a CT under load should not be opened because of______ - Answer- Induced
hight voltage
In a transformer,______ - Answer- Electromagnetic induction occurs
, When a ground rod is installed, the top of the rod must be positioned _____.grade - Answer- Flush
with or below
When making offset bends, the two kicks must be made perfectly parallel or the resulting offset will
have a ________ - Answer- Crooked bend
All of the following types of condulet may be used as a pulling point for conduit that requires a 90
degree change in direction, except_______ - Answer- C
To be effective, a grounding system must limit the voltage on the electrical system and protect it
from all of the following, except ______ - Answer- Undervoltage conditions
What is the most common service use in a temporary power panel? - Answer- 120/240 volt, 1-
phase, 3-wire
What are the 2 most common types of overcurrent protective devices? - Answer- Circuit breakers
and fuses
What instrument is use to perform an insulation resistance test on a 480 volt motor winding? -
Answer- Megohmmeter
What is a seal installed in a run of conduit in a class I location? - Answer- Prevent the passage of
explosive gases in the conduit
Which of the following is the correct formula for OHM's law? - Answer- I=E/R
Which of the following testing instruments operated on the current transformer principle - Answer-
Clamp-on ammeter
A drowning showing a point A to point B hookup of conductors is called a - Answer- Wiring
diagram
What does HOA usually mean in a motor control circuit - Answer- Hands of automatic
A120/208 Volt feeder consist of an 800 ft run of 500 kcmil aluminum wire in conduit. This feeder
has 5% voltage drop. What will the phase-toPhase voltage be at the load end - Answer- 197.60
volts
What is voltage? - Answer- electromotive force
What is the standard wire size system used in the United States? - Answer- AWG
A switch labeled "AL-CU" can be use with what type of wire? - Answer- Aluminum Copper and
copper clad aluminum
What type of conduit fitting is usually placed in the middle of a long run of rigid metal conduit to
provide access for pulling wire - Answer- C
What is the largest size of aluminum rigid conduit couplings? - Answer- 6"
