Electrical Engineering : Dc Motors QUESTIONS AND ANSWERS :: part5 : 11 to 15
Following Electrical Engineering Multiple choice objective type questions and answers will help you in BSNL JTO, GATE 2024 and IES 2024 examinations :
11.If a D.C. shunt motor is working at full load and if shunt field circuit suddenly opens |
| this will make armature to take heavy current, possibly burning it |
| this will result in excessive speed, possibly destroying armature due to excessive centrifugal stresses |
| nothing will happen to motor |
| motor will come to stop |
12.During rheostat braking of D.C. series motors |
| motor is run as a generator |
| motor is reversed in direction |
| motor is run at reduced speed |
| motor is run as a generator |
13.Hopkinson's test on D.C. machines is conducted at |
| no-load |
| part load |
| full-load |
| overload |
14.The condition for maximum efficiency for a D.C. generator is |
| eddy current losses = stray losses |
| hysteresis losses = eddy current losses |
| copper losses = 0 |
| variable losses = constant losses |
15.D.C. generators are installed near the load centres to reduce |
| iron losses |
| line losses |
| sparking |
| corona losses |
More Dc Motors QUESTIONS AND ANSWERS available in next pages
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