Question 1

Color selection for ungrounded "hot" conductors can be just about any solid color except green, white, gray, or any color conductor (except ____)that has three continuous white stripes.

Accepted Answer

A) black 
B) blue 
C) red 
D) green D

Question 2

____ fuses are designed to withstand motor-starting inrush currents and will not open needlessly.

Accepted Answer

A) Ordinary 
B) Branch-circuit 
C) Dual-element, time-delay 
D) Nontime-delay C

Question 3

NEMA rated motors are designed to operate at plus or minus ____ percent of their nameplate rated voltage.

Accepted Answer

A) 10 
B) 20 
C) 30 
D) 40 A

Question 4

Motors marked with Insulation Class B are suitable for use in ambient temperatures of up to ____ degrees Celsius.

Accepted Answer

A) 105 
B) 130 
C) 155 
D) 180

Question 5

A motor may be loaded continuously up to the horsepower obtained by multiplying the rated horsepower by the ____.

Accepted Answer

A) switch rating 
B) ambient temperature 
C) service factor 
D) insulation rating

Question 6

In three-phase motors, each phase is ____ degrees out of phase (symmetrical)with the other phases.

Accepted Answer

A) 60 
B) 90 
C) 120 
D) 360

Question 7

____ means the difference between motor winding temperature and the ambient temperature.

Accepted Answer

A) Operating temperature 
B) Service factor 
C) Overcurrent 
D) Temperature rise

Question 8

What is the minimum starting current for a 240-volt, 3-phase, Code letter J, 7-1/2-horsepower motor?

Accepted Answer

A) 114 amperes 
B) 128 amperes 
C) 132 amperes 
D) 144 amperes

Question 9

​What are some causes of motor failure?

Accepted Answer

The answer of ​What are some causes of motor failure?...

Question 10

NEC  430.24 requires that the conductors supplying several motors, or a motor(s)and other load(s), shall have an ampacity not less than ____ percent of the full-load current rating of the highest rated motor.

Accepted Answer

A) 75 
B) 100 
C) 125 
D) 150

Question 11

____ is the most common cause of motor failure.

Accepted Answer

A) An open contact 
B) Unbalanced voltage 
C) Single phasing 
D) Incorrect service factor

Question 12

What are some possible causes of unbalanced voltage?

Accepted Answer

The answer of What are some possible causes of unbalanced...

Question 13

For most applications, the motor circuit switch for a motor must be ____.

Accepted Answer

A) general-use 
B) isolating 
C) overcurrent 
D) horsepower rated

Question 14

What is the relationship between the Code letter and starting current?

Accepted Answer

The answer of What is the relationship between the Code...

Question 15

Describe Type 2 short-circuit protection.

Accepted Answer

The answer of Describe Type 2 short-circuit protection....

Question 16

When referring to motor controllers in the United States, we prefer to use the term ____ instead of coordination because coordination has a different meaning.

Accepted Answer

A) protection 
B) isolation 
C) breaking 
D) service

Question 17

An appliance is rated at 4500 volt-ampere, 240 volts, single-phase. What is the maximum size fuse permitted?

Accepted Answer

A) 20-ampere 
B) 30-ampere 
C) 40-ampere 
D) 50-ampere

Question 18

The reason the Code uses the term ____ instead of motor is that, in many instances, the motor is inside an enclosure and is out of sight until an access panel is removed.

Accepted Answer

A) motor location 
B) lock-out 
C) start-stop 
D) motor vicinity

Question 19

For every ____ degree Celsius rise above the motor's rated temperature, the motor's insulation life is cut in half.

Accepted Answer

A) 5 
B) 10 
C) 32 
D) 50

Question 20

What are the rules that govern air-conditioning and refrigerating equipment disconnect means?

Accepted Answer

The answer of What are the rules that govern air-conditioning...

Exam 7: Motor and Appliance Circuits

Color selection for ungrounded "hot" conductors can be just about any solid color except green, white, gray, or any color conductor (except ____) that has three continuous white stripes.

____ fuses are designed to withstand motor-starting inrush currents and will not open needlessly.

NEMA rated motors are designed to operate at plus or minus ____ percent of their nameplate rated voltage.

Motors marked with Insulation Class B are suitable for use in ambient temperatures of up to ____ degrees Celsius.

A motor may be loaded continuously up to the horsepower obtained by multiplying the rated horsepower by the ____.

In three-phase motors, each phase is ____ degrees out of phase (symmetrical) with the other phases.

____ means the difference between motor winding temperature and the ambient temperature.

What is the minimum starting current for a 240-volt, 3-phase, Code letter J, 7-1/2-horsepower motor?

What are some causes of motor failure?

NEC 430.24 requires that the conductors supplying several motors, or a motor(s) and other load(s) , shall have an ampacity not less than ____ percent of the full-load current rating of the highest rated motor.

____ is the most common cause of motor failure.

What are some possible causes of unbalanced voltage?

For most applications, the motor circuit switch for a motor must be ____.

What is the relationship between the Code letter and starting current?

Describe Type 2 short-circuit protection.

When referring to motor controllers in the United States, we prefer to use the term ____ instead of coordination because coordination has a different meaning.

An appliance is rated at 4500 volt-ampere, 240 volts, single-phase. What is the maximum size fuse permitted?

The reason the Code uses the term ____ instead of motor is that, in many instances, the motor is inside an enclosure and is out of sight until an access panel is removed.

For every ____ degree Celsius rise above the motor's rated temperature, the motor's insulation life is cut in half.

What are the rules that govern air-conditioning and refrigerating equipment disconnect means?

Exam 7: Motor and Appliance Circuits

Color selection for ungrounded "hot" conductors can be just about any solid color except green, white, gray, or any color conductor (except ____) that has three continuous white stripes.

____ fuses are designed to withstand motor-starting inrush currents and will not open needlessly.

NEMA rated motors are designed to operate at plus or minus ____ percent of their nameplate rated voltage.

Motors marked with Insulation Class B are suitable for use in ambient temperatures of up to ____ degrees Celsius.

A motor may be loaded continuously up to the horsepower obtained by multiplying the rated horsepower by the ____.

In three-phase motors, each phase is ____ degrees out of phase (symmetrical) with the other phases.

____ means the difference between motor winding temperature and the ambient temperature.

What is the minimum starting current for a 240-volt, 3-phase, Code letter J, 7-1/2-horsepower motor?

​What are some causes of motor failure?

NEC 430.24 requires that the conductors supplying several motors, or a motor(s) and other load(s) , shall have an ampacity not less than ____ percent of the full-load current rating of the highest rated motor.

____ is the most common cause of motor failure.

What are some possible causes of unbalanced voltage?

For most applications, the motor circuit switch for a motor must be ____.

What is the relationship between the Code letter and starting current?

Describe Type 2 short-circuit protection.

When referring to motor controllers in the United States, we prefer to use the term ____ instead of coordination because coordination has a different meaning.

An appliance is rated at 4500 volt-ampere, 240 volts, single-phase. What is the maximum size fuse permitted?

The reason the Code uses the term ____ instead of motor is that, in many instances, the motor is inside an enclosure and is out of sight until an access panel is removed.

For every ____ degree Celsius rise above the motor's rated temperature, the motor's insulation life is cut in half.

What are the rules that govern air-conditioning and refrigerating equipment disconnect means?

What are some causes of motor failure?