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Q#1
Synchronous Machines
GATE EE 2001
NAT
+2 marks
-0 marks
A 50 kW synchronous motor is tested by driving it by another motor. When the excitation is not switched on, the driving motor takes 800W. When the armature is short circuited and the rated armature current of 10A is passed through it, the driving motor required 2500 W. On open-circuiting the armature with rated excitation, the driving motor takes 1800W.
Calculate the efficiency of the synchronous motor at 50% load. Neglect the losses in the driving motor.
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| Topic | Questions | Attempted | Correct | |
|---|---|---|---|---|
| Network Analysis | 268 | 0 | 0 | |
| Signals and Systems | 168 | 0 | 0 | |
| Control Systems | 262 | 0 | 0 | |
| Analog Electronics | 186 | 0 | 0 | |
| Digital Electronics | 150 | 0 | 0 | |
| Electrical Machines | 399 | 0 | 0 | |
| Power Electronics | 243 | 0 | 0 | |
| Power Systems | 350 | 0 | 0 | |
| EMFT EE | 111 | 0 | 0 | |
| Measurement | 160 | 0 | 0 | |
| Engineering Mathematics | 236 | 0 | 0 | |
| General Aptitude | 221 | 0 | 0 |
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