DC Part1
In a DC motor, the_____ contains a laminated, soft-iron core, coils, and a commutator, all mounted on a rotatable steel shaft.
What is armature assembly
What is shunt.
DC motor speed can be controlled by varying the current in the :
What is field windings
The eddy current losses are reduced by ____ the field poles, frame and armature.
What is laminating.
The term that describes the combined resistive forces in an AC circuit is?
What is impedance.
In a DC motor, the consists of the field frame, the pole pieces, and the field coils.
What is Field assembly
The ____ DC motor is a combination of the series and shunt motors. There are two windings in the field: a shunt winding and a series winding.
What is compound.
The three-phase AC induction motor is also called a ____ motor.
What is squirrel cage.
The reactance of the armature is reduced by using a ____ embedded in the pole pieces.
What is compensating winding.
The working voltage of a capacitor in an ac circuit should be:
At least 50 percent greater than the highest applied voltage.
In a DC motor, the ______ consists of the brushes and their holders.
What is the brush Assembly.
When the armature in a DC motor rotates in a magnetic field, a voltage is induced in its windings. This voltage is called the back or counter emf and is opposite in direction to the voltage applied to the motor from the external source. This counter emf opposes the current, which causes the armature to:
What is rotate.
A single-phase AC motor has _____ stator windings.
What is only one.
The schematic symbol for the motor is what?? First to draw wins.
correct.
Potential difference is measured in______.
What is volts.
In a DC motor, the bearing for the drive end is located in the_____?
What is end frame.
DC motors built for intermittent dury can be operated for short periods only and, then, must be allowed to ____ before being operated again.
What is cool down.
The direction of rotation of a three-phase induction motor can be changed by simply____ two of the leads to the motor.
What is reversing.
The stationary portion of an AC induction motor is called a stator, and the rotating member is called a :
The correct way to connect a voltmeter in a circuit is ____.
What is parallel.
Because of the low resistance in the windings, the DC_____ motor is able to draw a large current during starting (low RPM) and the current will decrease as the RPM increases.
What is series.
By reversing the direction of the current flow in either the armature or the field windings, the direction of a DC motor's rotation may be:
What is reversed.
An AC series motor is a single-phase motor but is not an induction or synchronous motor. It resembles a DC motor in that it has:
What is brushes and cummutator.
The_____ on an AC motor usually gives the number of poles and the speed at which the motor is designed to run.
What is data plate.
convert .001A to a microampere. First to show wins!
Correct.