Question 371. 7. If the load of a synchronous motor is increases while keeping the field excitation constant, then

Question 372. 0. The field winding of a 3-phase synchronous motor is short-circuited directly. If a 3-phase balanced voltage is impressed across the stator terminals,then the rotor will

Question 373. 8. A synchronous motor operates as a synchronous condensor when it is

Question 374. 9.  The reluctance power of a salient-pole synchronous motor does not depend upon the field excitation but on the degree of saliency. The expression for reluctance power is (the terms have their usual meanings.V2 (Xd?Xq )

Question 375. 1.  A 3-phase synchronous motor with negligible losses is connected to the supply at rated frequency and constant terminal voltage 'V'. The induced emf of the motor is designated as E. If the motor is now gradually loaded to its rated power, adjusting its excitation to obtain, say 0.8 leading power factor operation, then E-phasor would

Question 376. 2. The field current of a synchronous motor is increased while its load it constant. How will its power angle and power factor change?

Question 377. 3. A synchronous motor runs at only one speed (i.e. synchronous speed) because it

Question 378. 4. An over-excited synchronous motor behaves as

Question 379. 8. A synchronous capacitor is an over-excited motor running at

Question 380. 9. A synchronous motor delivers reactive power when