Electrical Engineering : Dc Motors QUESTIONS AND ANSWERS :: part4 : 21 to 25
Following Electrical Engineering Multiple choice objective type questions and answers will help you in BSNL JTO, GATE 2024 and IES 2024 examinations :
21.In a manual shunt motor starter |
| over load relay is connected in series and no volt relay in parallel with the load |
| over load relay is connected in paral�lel and no volt relay in series with the load |
| over load relay and no volt relay are both connected in series with the load |
| over load relay and no volt relay are both connected in parallel with the load |
22.Why are the D.C. motors preferred for traction applications ? |
| Torque and speed are inversely proportional to armature current |
| Torque is proportional to armature current |
| Torque is proportional to square root of armature current |
| The speed is inversely proportional to the torque and the torque is proportional to square of armature current |
23.The plugging gives the |
| zero torque braking |
| smallest torque braking |
| highest torque braking |
| none of the above |
24.Which of the following losses are significantly reduced by laminating the core of a D.C. generator ? |
| Hysteresis losses |
| Eddy current losses |
| Copper losses |
| Windage losses |
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