Chapter 16 Electric Motors

A DC series motor is a DC motor that has the armature and field circuits wired in parallel.

False

An AC shunt motor is a motor that has the field connected in parallel with the armature.

False

The stator is the rotating part of an AC motor.

False

Work is any cause that changes the position, motion, direction, or shape of an object.

False

___ torque is the torque required to start a motor.

Starting

___ is the theoretical speed of a motor based on the motor's number of poles and the line of frequency.

Synchrorous

___ is the force that causes an object to rotate.

Torque

An induction motor is a motor that has no physical electrical connections to the rotor.

True

Electrical power is rated in horsepower or watts.

True

Full-load torque is the torque required to produce the rated power at full speed of the motor.

True

Insulation breakdown is the main cause of motor failure.

True

A(n) ___ motor is a motor that operates at more than one voltage level.

dual voltage

A(n) ___ is a rotating output device that converts electrical power into a rotating, mechanical force.

electric motor

A DC ___ motor is a DC motor that has only one armature connections and no field connections.

permanent magnet

___ is the rate of doing work or using energy.

power

___ torque is the torque required to bring a load up to its rated speed.

pull up

A DC ___ motor is a DC motor that has the series field coils connected in series with the armature.

shunt

A(n) ___ motor is and electric device 1(phase), AC motor that includes a running winding (main winding) and a starting winding (auxiliary winding).

split phase

The ___ is the stationary part of an AC motor.

stator

A(n) ___ switch is a switch that operates its contacts when a preset temperature is reached.

thermal OV

___ is the temperature of the air surrounding a piece of equipment.

Ambient

___ torque is the maximum torque a motor can produce without an abrupt reduction in motor speed.

Break down

___ torque is the torque a motor produces when the rotor is stationary and full power is applied to the motor.

Locked rotor

___ torque is the force that produces or tends to produce rotation in a motor.

Motor

___ is a measure of the effectiveness with which a motor converts electrical energy to mechanical energy.

Motor effeciency

A(n) ___ motor is a 1(phase), AC motor that includes a capacitor in addition to the running and start windings.

capacitor

A(n) ___ motor is a capacitor motor that has the starting winding and capacitor connected in series at all times.

capacitor run

A DC ___ motor is a DC motor that has the series field connected in series with the armature and the shunt field connected in parallel with the series field and armature.

compound