NEC Master All 9 Practice tests in one |
Newest Edition | With complete solution|
Latest 2024/25
If two 10-ohm resistors are connected in series, what is the total resistance of these
resistors? - 20 ohms
In a split-phase motor, how much greater is the starting current when compared to the
full-load current? - 6 to 8 times
The terminals of a motor can be identified using a battery and a ___ - voltmeter
A 5-ohm and a 20-ohm resistor are connected in parallel. What is the total resistance
of these two resistors? - 4 ohms
The normal location to provide overcurrent protection in an electrical circuit is ___ -
where the conductor receives its supply
Which factor determines the outcome of an electrical shock? - The amount of current
Isolated power systems are used to prevent ___ - power interruption
The speed of a three-phase squirrel cage induction motor is controlled by the
frequency of the applied voltage and ___ - the number of poles
Where insulating protective equipment may be damaged, it ___ - requires its own
protection (e.g., leather gauntlets over rubber gloves)
Individual branch circuits are not required for portable X-ray equipment requiring no
more than ___ - 60A
The type of rubber protective equipment that is made of natural rubber or a vulcanized
synthetic is ___ - Type 1
Line isolation monitors must have a green signal lamp that glows when the system is
isolated from ground and located ____ - so it is visible to staff in the anesthetizing
location
Under strict safety guidelines, which of the following should be used to discharge
capacitors before working on de-energized circuits? - A safety shorting probe
, Which of the following motors is the best installation choice for an application requiring
adjustable speeds? - Shunt DC
To make sure the voltage is turned off before touching any terminals, use a ___ -
voltage tester
If you bend from the waist to pick up an object weighing 20 pounds, the amount of
pressure applied to your lower back is ___ - 200 pounds
In addition to the NEC, the emergency electrical power for hospitals is governed by the
___ - Joint Commission
OSHA CFR 1910 is the standard for ______. - general industry
The most common conductors used for light and power installations range from ___ -
4/0 to No. 14 AWG
A circuit has a source voltage of 50V and a current of 10A. What is the power in watts?
- 500
What is the total resistance of a two-wire circuit that spans a distance of 200' each way
if the resistance per 1,000' is 1.21 ohms? - 0.484 ohm
The primary method of varying the speed on a DC shunt motor is to adjust the voltage
and current on the field winding or the ___ - armature
The normal beating heart can be upset by an electrical current as small as ___ -
75mA
A three-phase induction motor may have ___ - 2 poles
Which of the following motors provides constant speed from no-load conditions to full-
load conditions? - Synchronous
If a circuit has 12 amps of current and the resistance is 20 ohms, the applied voltage is
___ - 240 volts
The power factor of an induction motor at no-load conditions can be as low as ___ -
15%
To keep the voltage drop of a 277V circuit to a maximum of 3%, what would be the
maximum allowable voltage drop? - 8.3V
Which of the following must be considered when determining the size of the conductor
required to connect an electrical load to the source of supply? - Permissible voltage
drop
, DC injection breaking is used on the ___ - the stationary windings of AC motors
According to NEMA definitions, which of the following is a type of open motor? -
Weather-protected
A polyphase synchronous motor has three stator windings that are ___ - 120
degrees apart
The value indicated in rpm on the nameplate is the ___ - rated full-load speed
In a medical facility, receptacles should be mounted ___ - 24" above the floor
Horsepower is used to rate the ___ - output capacity of a motor
If a circuit has 48 amps of current and an applied voltage of 240 volts, the resistance is
___ - 5 ohms
The NEC requires motor disconnecting means be ___ - within sight of the controller
location
What is the applied voltage if the current in a circuit is 60 amps and the resistance is
10 ohms? - 600 volts
Which of the following substances is considered a good semiconductor? - Silicon
If the resistance of a circuit is 25 ohms and the current is 10 amps, the power in watts
is ___ - 2,500
Which of the following is used to step voltage down to lower levels before it reaches a
home or office? - Transformer
The stationary magnet of a DC motor is represented by the ___ - field poles
For a constant-torque load, the horsepower increases and decreases ___ - in direct
proportion to the speed
Any exposed live parts must be guarded if they are operating at ___ - 50V or more
between terminals
Which of the following motors is used when the required starting torque is high and
speed control is desirable? - Compound
A correction factor must be applied if the ambient temperature is above ___ - 86
degrees Fahrenheit
, Health care facilities are often supplied by two or more distribution points; this is known
as a ____ - spot network
What must happen before any work may be performed in a confined space? -
Completion of a hazard review
A delta-connected motor has ___ - 9 leads
The synchronous speed at which a four-pole, 60Hz induction motor operates is ___ -
II II II II II II II II II II II II II II II II II II
1,800 rpm
II II
According to NEMA definitions, which of the following is a type of totally enclosed motor?
II II II II II II II II II II II II II II II II
- water-cooled
II II II II II
II II If a conductor has a diameter of 40 mils, what is the diameter in inches? - 0.04"
II II II II II II II II II II II II II II II II II II II
II II A typical constant-torque load would be a ___ - conveyor
II II II II II II II II II II II II
II II NFPA 70E provides practical guidance in______. - electrical hazard assessment
II II II II II II II II II II II II
II II Attachment plugs and receptacles in hazardous locations must be listed for use in ____ - II II II II II II II II II II II II II II II
Class I, Group C locations
II II II II II II II
Which of the following should have side rails that extend 36 inches above the top support
II II II II II II II II II II II II II II II II II
point? - Straight ladders
II II II II II II II
How many amps are there in the current of a circuit if the voltage source is 140V and the
II II II II II II II II II II II II II II II II II II II II
resistance is 2 ohms? - 70 amps
II II II II II II II II II II
II II Installation of X-ray equipment is governed by ____ - NEC Article 517, Part V II II II II II II II II II II II II II II II II
II II Which of the following is most likely to use dynamic braking? - Forklift
II II II II II II II II II II II II II II II
If five No. 10 AWG current-carrying conductors are installed in a raceway where the
II II II II II II II II II II II II II II II
ambient temperature is 70 degrees Fahrenheit, the allowable ampacity must be ___ -
II II II II II II II II II II II II II II II II
reduced by 80% of its value
II II II II II II
The square mil area of a conductor that is 0.250" on all sides is ____ - 62,500 square
II II II II II II II II II II II II II II II II II II II II II II
mils
II
You are required to be evaluated by a physician to ensure that you are physically fit to
II II II II II II II II II II II II II II II II II II
use which of the following types of protective equipment? - Respirator
II II II II II II II II II II II II II II
Low voltage equipment that is typically in contact with patients must be moisture-
II II II II II II II II II II II II II II
resistant and operate on ___ - 10V or less II II II II II II II II II II II
Newest Edition | With complete solution|
Latest 2024/25
If two 10-ohm resistors are connected in series, what is the total resistance of these
resistors? - 20 ohms
In a split-phase motor, how much greater is the starting current when compared to the
full-load current? - 6 to 8 times
The terminals of a motor can be identified using a battery and a ___ - voltmeter
A 5-ohm and a 20-ohm resistor are connected in parallel. What is the total resistance
of these two resistors? - 4 ohms
The normal location to provide overcurrent protection in an electrical circuit is ___ -
where the conductor receives its supply
Which factor determines the outcome of an electrical shock? - The amount of current
Isolated power systems are used to prevent ___ - power interruption
The speed of a three-phase squirrel cage induction motor is controlled by the
frequency of the applied voltage and ___ - the number of poles
Where insulating protective equipment may be damaged, it ___ - requires its own
protection (e.g., leather gauntlets over rubber gloves)
Individual branch circuits are not required for portable X-ray equipment requiring no
more than ___ - 60A
The type of rubber protective equipment that is made of natural rubber or a vulcanized
synthetic is ___ - Type 1
Line isolation monitors must have a green signal lamp that glows when the system is
isolated from ground and located ____ - so it is visible to staff in the anesthetizing
location
Under strict safety guidelines, which of the following should be used to discharge
capacitors before working on de-energized circuits? - A safety shorting probe
, Which of the following motors is the best installation choice for an application requiring
adjustable speeds? - Shunt DC
To make sure the voltage is turned off before touching any terminals, use a ___ -
voltage tester
If you bend from the waist to pick up an object weighing 20 pounds, the amount of
pressure applied to your lower back is ___ - 200 pounds
In addition to the NEC, the emergency electrical power for hospitals is governed by the
___ - Joint Commission
OSHA CFR 1910 is the standard for ______. - general industry
The most common conductors used for light and power installations range from ___ -
4/0 to No. 14 AWG
A circuit has a source voltage of 50V and a current of 10A. What is the power in watts?
- 500
What is the total resistance of a two-wire circuit that spans a distance of 200' each way
if the resistance per 1,000' is 1.21 ohms? - 0.484 ohm
The primary method of varying the speed on a DC shunt motor is to adjust the voltage
and current on the field winding or the ___ - armature
The normal beating heart can be upset by an electrical current as small as ___ -
75mA
A three-phase induction motor may have ___ - 2 poles
Which of the following motors provides constant speed from no-load conditions to full-
load conditions? - Synchronous
If a circuit has 12 amps of current and the resistance is 20 ohms, the applied voltage is
___ - 240 volts
The power factor of an induction motor at no-load conditions can be as low as ___ -
15%
To keep the voltage drop of a 277V circuit to a maximum of 3%, what would be the
maximum allowable voltage drop? - 8.3V
Which of the following must be considered when determining the size of the conductor
required to connect an electrical load to the source of supply? - Permissible voltage
drop
, DC injection breaking is used on the ___ - the stationary windings of AC motors
According to NEMA definitions, which of the following is a type of open motor? -
Weather-protected
A polyphase synchronous motor has three stator windings that are ___ - 120
degrees apart
The value indicated in rpm on the nameplate is the ___ - rated full-load speed
In a medical facility, receptacles should be mounted ___ - 24" above the floor
Horsepower is used to rate the ___ - output capacity of a motor
If a circuit has 48 amps of current and an applied voltage of 240 volts, the resistance is
___ - 5 ohms
The NEC requires motor disconnecting means be ___ - within sight of the controller
location
What is the applied voltage if the current in a circuit is 60 amps and the resistance is
10 ohms? - 600 volts
Which of the following substances is considered a good semiconductor? - Silicon
If the resistance of a circuit is 25 ohms and the current is 10 amps, the power in watts
is ___ - 2,500
Which of the following is used to step voltage down to lower levels before it reaches a
home or office? - Transformer
The stationary magnet of a DC motor is represented by the ___ - field poles
For a constant-torque load, the horsepower increases and decreases ___ - in direct
proportion to the speed
Any exposed live parts must be guarded if they are operating at ___ - 50V or more
between terminals
Which of the following motors is used when the required starting torque is high and
speed control is desirable? - Compound
A correction factor must be applied if the ambient temperature is above ___ - 86
degrees Fahrenheit
, Health care facilities are often supplied by two or more distribution points; this is known
as a ____ - spot network
What must happen before any work may be performed in a confined space? -
Completion of a hazard review
A delta-connected motor has ___ - 9 leads
The synchronous speed at which a four-pole, 60Hz induction motor operates is ___ -
II II II II II II II II II II II II II II II II II II
1,800 rpm
II II
According to NEMA definitions, which of the following is a type of totally enclosed motor?
II II II II II II II II II II II II II II II II
- water-cooled
II II II II II
II II If a conductor has a diameter of 40 mils, what is the diameter in inches? - 0.04"
II II II II II II II II II II II II II II II II II II II
II II A typical constant-torque load would be a ___ - conveyor
II II II II II II II II II II II II
II II NFPA 70E provides practical guidance in______. - electrical hazard assessment
II II II II II II II II II II II II
II II Attachment plugs and receptacles in hazardous locations must be listed for use in ____ - II II II II II II II II II II II II II II II
Class I, Group C locations
II II II II II II II
Which of the following should have side rails that extend 36 inches above the top support
II II II II II II II II II II II II II II II II II
point? - Straight ladders
II II II II II II II
How many amps are there in the current of a circuit if the voltage source is 140V and the
II II II II II II II II II II II II II II II II II II II II
resistance is 2 ohms? - 70 amps
II II II II II II II II II II
II II Installation of X-ray equipment is governed by ____ - NEC Article 517, Part V II II II II II II II II II II II II II II II II
II II Which of the following is most likely to use dynamic braking? - Forklift
II II II II II II II II II II II II II II II
If five No. 10 AWG current-carrying conductors are installed in a raceway where the
II II II II II II II II II II II II II II II
ambient temperature is 70 degrees Fahrenheit, the allowable ampacity must be ___ -
II II II II II II II II II II II II II II II II
reduced by 80% of its value
II II II II II II
The square mil area of a conductor that is 0.250" on all sides is ____ - 62,500 square
II II II II II II II II II II II II II II II II II II II II II II
mils
II
You are required to be evaluated by a physician to ensure that you are physically fit to
II II II II II II II II II II II II II II II II II II
use which of the following types of protective equipment? - Respirator
II II II II II II II II II II II II II II
Low voltage equipment that is typically in contact with patients must be moisture-
II II II II II II II II II II II II II II
resistant and operate on ___ - 10V or less II II II II II II II II II II II
