|
When the rotor speed, in a synchronous machine, becomes more than ___
|
|
0
|
139
|
November 3, 2021
|
|
Synchronous motors are
|
|
0
|
140
|
November 3, 2021
|
|
The back e.m.f. of a synchronous motor depends ___
|
|
0
|
175
|
November 3, 2021
|
|
Three-phase alternators are invariably star-connected because ___
|
|
0
|
1080
|
August 8, 2021
|
|
Unbalanced 3 phase stator currents cause ___
|
|
0
|
213
|
August 8, 2021
|
|
In an alternator short circuit current is limited by ___
|
|
0
|
455
|
August 8, 2021
|
|
The rotor preffered for low speed hydro-generator is ___
|
|
0
|
181
|
August 8, 2021
|
|
Smooth cylindrical rotors are usually designed for ___
|
|
0
|
507
|
August 8, 2021
|
|
In synchronous machine the stator frame serves the ___
|
|
0
|
238
|
August 8, 2021
|
|
Hydro-Generators are generally employed to run at ___
|
|
0
|
264
|
August 8, 2021
|
|
The maximum current that can be supplied by ___
|
|
0
|
541
|
August 8, 2021
|
|
The seventh space harmonics in the mmf produced by balanced ___
|
|
0
|
790
|
August 8, 2021
|
|
In an alternator, the armature reaction is considered to be equivalent to a fictitious ___
|
|
0
|
327
|
August 7, 2021
|
|
In synchronous generator, the effect of cross magnetization is to ___
|
|
0
|
203
|
August 7, 2021
|
|
Synchronous reactance of an alternator is due to ___
|
|
0
|
214
|
August 7, 2021
|
|
Regulation of an alternator supplying resistive or inductive load is ___
|
|
0
|
492
|
August 7, 2021
|
|
The short circuit characteristic of an alternator is ___
|
|
0
|
227
|
August 7, 2021
|