Electric Motors

Question 1

current in amperes a conductor can carry continuously under the condition of use without exceeding its temperature rating.

Answer 1

Ampacity

Question 2

a switch or group of devices or other means by which the electric motor can be disconnected from the power supply.

Answer 2

Disconnecting Means

Question 3

refers to how frequently the motor is started and how long it will run each time it is started.

Answer 3

Duty Rating

Question 4

number of individual voltages applied to the motor.

Answer 4

Phase

Question 5

has three individual voltages applied to the motor.

Answer 5

Three-phase

Question 6

has one voltage applied to the motor in the shape of a sine wave.

Answer 6

Single phase

Question 7

Armature winding or rotating part of electric motor which is typically constructed of a laminated steel core containing current carrying copper wires.

Answer 7

Rotor

Question 8

field poles or stationary part of electric motor consisting of copper windings which is placed in a laminated iron core

Answer 8

Stator

Question 9

indicates the maximum load that can be successfully carried by the motor if it is to be operated continuously and remain within a safe temperature range.

Answer 9

Service Factor

Question 10

twisting or turning force produced by the motor.

Answer 10

Torque

Question 11

maximum torque a motor can develop during overload without stalling.

Answer 11

Breakdown Torque

Question 12

motor torque at zero speed or the maximum torque required to start the load.

Answer 12

Starting Toque