Electrical Engineering : Industrial Drives QUESTIONS AND ANSWERS :: part3 : 1 to 5
Following Electrical Engineering Multiple choice objective type questions and answers will help you in BSNL JTO, GATE 2024 and IES 2024 examinations :
1.In series motor which of the following methods can be used for changing the flux per pole ? |
| Tapped field control |
| Diverter field control |
| Series-parallel control |
| Any of the above |
2.The cost of an induction motor will increase as |
| horsepower rating increases but r.p.m. decreases |
| horsepower rating decreases but r.p.m. increases |
| horsepower rating and operating speed increases |
| horsepower rating and operating speed decreases |
3.Which of the following alternatives will be cheaper ? |
| A 100 H.P. AC. three phase motor |
| Four motors of 25 H.P. each |
| Five motors of 20 H.P. each |
| Ten motors of 10 H.P. each |
4.Which of the following motors is preferred for boom hoist of a travelling crane ? |
| Single phase motor |
| Synchronous motor |
| A.C. slip ring motor |
| Ward-Leonard controlled D.C. shunt motor |
5.A wound rotor induction motor is preferred, as compared to squirrel cage induction motor, when major consideration is |
| slop speed operation |
| high starting torque |
| low windage losses |
| all of the above |
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