Electrical Engineering : Dc Motors QUESTIONS AND ANSWERS :: part4 : 6 to 10
Following Electrical Engineering Multiple choice objective type questions and answers will help you in BSNL JTO, GATE 2024 and IES 2024 examinations :
6.D.C. shunt motors are used for driving |
| trains |
| cranes |
| hoists |
| machine tools |
7.The main disadvantage of the Ward-Leonard control method is |
| high initial cost |
| high maintenance cost |
| low efficiency at Hght loads |
| all of the above |
8.Which of the following motors is usually used in house-hold refrigerators ? |
| D.C. shunt motor |
| D.C. series motor |
| Single phase induction motor (split phase start or induction run motor) |
| Reluctance motor |
9.Regenerative method of braking is based on that |
| back e.m.f. is less than the applied voltage |
| back e.m.f. is equal to the applied voltage |
| back e.m.f. of rotor is more than the applied voltage |
| none of the above |
10.In Ward-Leonard control the lower limit of speed is imposed by |
| residual magnetism of the generator |
| core losses of motor |
| mechanical losses of motor and gen�erator together |
| all of the above |
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