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 |
| plugging |
| dynamic braking |
| none of the above |
| any of the above |
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