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?