Electrical Engineering : Industrial Drives QUESTIONS AND ANSWERS :: part3 : 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.For which of the following applications motor has to start with high acceleration? |
| Oil expeller |
| Floor mill |
| Lifts and hoists |
| Centrifugal pump |
7.For a D.C. shunt motor which of the following is incorrect 7 |
| Unsuitable for heavy duty starting |
| Torque varies as armature current |
| Torque-armature current is a straight line |
| Torque is zero for zero armature current |
8.The diameter of the rotor shaft for an electric motor depends on which of the following ? |
| r.p.m. only |
| Horse power only |
| Horse power and r.p.m. |
| Horse power, r.p.m. and power factor |
9.Which of the following happens when star-delta starter is used ? |
| Starting voltage is reduced |
| Starting current is reduced |
| Both (a) and (b) |
| None of the above |
10.Which of the following types of motor enclosure is safest ? |
| Totally enclosed |
| Totally enclosed fan cooled |
| Open type |
| Semi closed |
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