Electrical Engineering : Dc Motors QUESTIONS AND ANSWERS :: part1 : 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.Starters are used with D.C. motors because |
| these motors have high starting torque |
| these motors are not self-starting |
| back e.m.f. of these motors is zero initially |
| to restrict armature current as there is no back e.m.f. while starting |
17.Which D.C. motor will be preferred for machine tools ? |
| Series motor |
| Shunt motor |
| Cumulative compound motor |
| Differential compound motor |
18.The direction of rotation of a D.C. series motor can be changed by |
| interchanging supply terminals |
| interchanging field terminals |
| either of (a) and (b) above |
| None of the above |
19.Which of the following application requires high starting torque ? |
| Lathe machine |
| Centrifugal pump |
| Locomotive |
| Air blower |
20.For starting a D.C. motor a starter is required because |
| it limits the speed of the motor |
| it limits the starting current to a safe value |
| it starts the motor |
| none of the above |
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