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Exam 7: Motor and Appliance Circuits

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Question 1

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

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

E) C) and D)
F) A) and C)

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Question 2

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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.

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

E) B) and D)
F) A) and B)

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Question 3

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

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

Describe Type 2 short-circuit protection.

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

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

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

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

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.

____ is the most common cause of motor failure.

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

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

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

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

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.

What are some possible causes of unbalanced voltage?

​What are some causes of motor failure?

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

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