Electrical Engineering Questions And Answers :: Dc Motors: part4

Electrical Engineering : Dc Motors QUESTIONS AND ANSWERS :: part4 : 16 to 20

Following Electrical Engineering Multiple choice objective type questions and answers will help you in BSNL JTO, GATE 2024 and IES 2024 examinations :

16.For constant torque drive which speed control method is preferred ?

Field control
Armature voltage control
Shunt armature control
Mechanical loading system

17.The losses occurring in a D.C. generator are given below. Which loss is likely to have highest proportion at rated load of the generator ?

hysteresis loss
field copper loss
armature copper loss
eddy current loss

18.The hysteresis loss in a D.C. machine least depends on

Frequency of magnetic reversals
Maximum value of flux density
Volume and grade of iron
Rate of flow of ventilating air

19.Which motor should not be started on no-load ?

Series motor
Shunt motor
Cumulatively compounded motor
Differentially compounded motor.

20.If the terminals of armature of D.C. motor are interchanged, this action will offer following kind of braking (o) regenerative

dynamic braking
none of the above
any of the above

More Dc Motors QUESTIONS AND ANSWERS available in next pages

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