PART A

THE ELECTRICAL CHARACTERISTICS OF A DC MOTOR IS THE CURVE BETWEEN

• Ta/Ia

• Ta/N

• N/Ia

• Ta/Eb

THE Ta/Ia GRAPH OF A DC SERIES MOTOR IS A 

• PARABOLA UPTO FULL LOAD AND STRAIGHT LINE AT OVERLOAD

• PARABOLA

• STRAIGHT LINE

• NONE OF THESE

Eb/V RATIO OF A DC MOTOR IS AN INDICATION OF ITS 

• LOSS

• EFFICIENCY

• MECHANICAL POWER

• ELECTRICAL POWER

THE SHAFT TORQUE IN A DC MOTOR IS LESS THAN THE TOTAL ARMATURE TORQUE BECAUSE OF ______ 

• IRON AND MECHANICAL LOSSES

• IRON LOSSES

• FRICTION LOSSES

• IRON AND COPPER LOSSES

THE FREQUENCY OF VOLTAGE GENERATED IN AN ALTERNATOR DEPENDS ON 

• SPEED AND NUMBER OF POLES

• SPEED AND ARMATURE CURRENT

• BACK EMF

• NONE OF THESE

IF THE POLE FLUX OF A DC MOTOR APPROACHES ZERO , ITS SPEED WILL

• ZERO

• 1

• APPROACHES TO INFINITY

• NONE OF THESE

THE SERIES FIELD OF A DC GENERATOR IS EXCITED BY _____ CURRENTS

• SHUNT CURRENT

• ARMATURE CURRENT

• LOAD CURRENT

• EXTERNAL

THE PRODUCTION OF A MAGNETIC FIELD BY CURRENT IN A CONDUCTOR -------

• FIELD STRENGTH

• ELECTROMAGNETISM

• PERMITIVITY

• RELUCTANCE

OPPOSITION TO THE ESTABLISHMENT OF A MAGNETIC FIELD IN A MATERIAL IS CALLED 

• FIELD STRENGTH

• RELUCTANCE

• FLUX DENSITY

• PERMITIVITY

THE SYMBOL OF MAGNETIC FLUX DENSITY

• B

• H

• R

• S