ELEC 18001

A dynamo can function as a:

• Generator only

• Motor only

• Both a Generator and a Motor

• Neither a Generator nor a Motor

With a two-valve capacitor motor, the start capacitor is:

• Electrolytic 300 µF

• Ceramic 100 µF

• Tantalum 200 µF

• Polyester 400 µF

In order to maintain rotation in the same direction, the current in the armature winding:

• Must remain constant

• Must reverse at 90°

• Must reverse at 270°

• Must reverse at 180°

An alternator is also called a:

• Induction motor

• Synchronous motor

• Asynchronous motor

• Universal motor

What is the unit for flux density?

• Weber

• Henry

• Farad

• Tesla

In a magnetic core, the region where the core no longer responds linearly to an increase in magnetic field strength is known as:

• Hysteresis loss

• Area of core saturation

• Eddy current loss

• Magnetic leakage

The shunt windings of a DC motor are made up of:

• Few turns of thick wire

• Few turns of fine wire

• Many turns of fine wire

• Many turns of thick wire

The temperature of the cooling medium associated with a motor or generator is called:

• Operating temperature

• Critical temperature

• Ambient temperature

• Maximum temperature

In a DC motor, the winding connection where the field winding is connected in parallel with both the armature and the series field is called:

• Short shunt

• Series shunt

• Long shunt

• Compound shunt

The polarity of the voltage at the brushes of a DC generator depends upon:

• Speed of rotation only

• Field strength only

• Direction of rotation and field polarity

• Armature resistance