The electrical NCCER test Questions with 100%
Verified Answers
In a transformer ______ - ANSWER -Electromagnetic Induction Ocurs
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
conduit that requires a 90 degree change in direction, except 42.All of the
following types of condulet may be used as a pulling point for _____ - 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 used 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 used to perform an insulation-resistance test on a 480- volt
motor winding? - ANSWER -Megohmmeter
Why 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 120/208 volt feeder consists of an 800 ft run of 500 kcmil aluminum wire in
conduit. This feeder has 5% voltage drop. What will the phase-to-phase voltage be
at the load end? - ANSWER -197.60 volts
What is voltage? - ANSWER -Electromotive force
A drawing 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
What is the standard wire size system used in the United States? - ANSWER -
AWG
A switch labeled "AL-CU" can be used with what type of wire? - ANSWER -
Aluminum Copper or 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"
What is the purpose of the thermocouple? - ANSWER -To measure temperature
A brass-colored terminal on a receptacle indicates that it should be used to connect
what type of wire? - ANSWER -Hot wire
What is the standard length of rigid conduit? - ANSWER -10 FT
An angle or U-pull is made with 14 wire or larger. The distance between each
raceway entry inside the box and the any less than how many times the trade
, opposite wall of the box shall NOT be diameter of the largest raceway? -
ANSWER -6 times
Where should stress cone be used? - ANSWER -High Voltage Termination
A cable rated for 5KV insulation can safely carry what MAXIMUM voltage? -
ANSWER -5,000 volts
What is the PRIMARY consideration in selecting the proper rope for a cable pull?
- ANSWER -Safety
Which of the following statements describes the operating features of a thermal
overload relay? - ANSWER -The greater the overload, the shorter the time of
tripping.
Normally, the easiest place to reverse the leads to change the direction of rotation
of a 3-phase motor is at the - ANSWER -Motor Starter
What is the largest size conductor that can terminate on a 20amp receptacle? -
ANSWER -12awg
Why can a lead acid battery be an explosive hazards? - ANSWER -Hydrogen gas
is produced during charge and discharge
What MAXIMUM number of bends is allowed between fittings in one conduit
run? - ANSWER -4 quarter bends or 360 degrees
What size wire is standard for a 120- volt motor control systems? - ANSWER -
#14
In all cases where live parts are normally exposed on the front of switchboards or
motor control centers the working space in front of such equipment MUST be what
MINIMUM length? - ANSWER -3Ft
Verified Answers
In a transformer ______ - ANSWER -Electromagnetic Induction Ocurs
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
conduit that requires a 90 degree change in direction, except 42.All of the
following types of condulet may be used as a pulling point for _____ - 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 used 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 used to perform an insulation-resistance test on a 480- volt
motor winding? - ANSWER -Megohmmeter
Why 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 120/208 volt feeder consists of an 800 ft run of 500 kcmil aluminum wire in
conduit. This feeder has 5% voltage drop. What will the phase-to-phase voltage be
at the load end? - ANSWER -197.60 volts
What is voltage? - ANSWER -Electromotive force
A drawing 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
What is the standard wire size system used in the United States? - ANSWER -
AWG
A switch labeled "AL-CU" can be used with what type of wire? - ANSWER -
Aluminum Copper or 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"
What is the purpose of the thermocouple? - ANSWER -To measure temperature
A brass-colored terminal on a receptacle indicates that it should be used to connect
what type of wire? - ANSWER -Hot wire
What is the standard length of rigid conduit? - ANSWER -10 FT
An angle or U-pull is made with 14 wire or larger. The distance between each
raceway entry inside the box and the any less than how many times the trade
, opposite wall of the box shall NOT be diameter of the largest raceway? -
ANSWER -6 times
Where should stress cone be used? - ANSWER -High Voltage Termination
A cable rated for 5KV insulation can safely carry what MAXIMUM voltage? -
ANSWER -5,000 volts
What is the PRIMARY consideration in selecting the proper rope for a cable pull?
- ANSWER -Safety
Which of the following statements describes the operating features of a thermal
overload relay? - ANSWER -The greater the overload, the shorter the time of
tripping.
Normally, the easiest place to reverse the leads to change the direction of rotation
of a 3-phase motor is at the - ANSWER -Motor Starter
What is the largest size conductor that can terminate on a 20amp receptacle? -
ANSWER -12awg
Why can a lead acid battery be an explosive hazards? - ANSWER -Hydrogen gas
is produced during charge and discharge
What MAXIMUM number of bends is allowed between fittings in one conduit
run? - ANSWER -4 quarter bends or 360 degrees
What size wire is standard for a 120- volt motor control systems? - ANSWER -
#14
In all cases where live parts are normally exposed on the front of switchboards or
motor control centers the working space in front of such equipment MUST be what
MINIMUM length? - ANSWER -3Ft
