Electrical Engineering : Dc Motors QUESTIONS AND ANSWERS :: part5 : 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.In variable speed motor |
| a stronger commutating field is needed at low speed than at high speed |
| a weaker commutating field is needed at low speed than at high speed |
| same commutating field is needed at low speed than at high speed |
| none of the above is correct |
7.In the D.C. motor the iron losses occur in |
| the field |
| the armature |
| the brushes |
| the commutator |
8.One D.C. motor drives another D.C. motor. The second D.C. motor when excited and driven |
| runs as a generator |
| does not run as a generator |
| also runs as a motor comes to stop after sometime |
| also runs as a motor comes to stop after sometime |
9.Which of the following tests will be suitable for testing two similar D.C. series motors of large capacity ? |
| Swinburne's test |
| Hopkinson's test |
| Field test |
| Brake test |
10.The speed of a D.C. shunt motor is required to be more than full load speed. This is possible by |
| reducing the field current |
| decreasing the armature current |
| increasing the armature current |
| increasing the excitation current |
More Dc Motors QUESTIONS AND ANSWERS available in next pages
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