-Select the correct answer for the alternatives given. -which of the following does not change in transformer a)-current b)-voltage c)- frequency d)-all of the above 2- The full-load copper loss and iron loss of transformer are 6400w and 5000w respectively. The copper loss and iron loss at half load will be respectively. . a)-(3200 w and 2500 w) b)-(1600 w and 1250 w), c)-(1600 w and 5000w d)- (3200 w and 1250 w) 3-A d.c. shunt motor is running with certain load. The effect of adding an external resistance in field circuit is to a)-reduce the motor speed b) increase the motor speed; c)- stop the motor d)- reduce the armature current of the motor 4- The emf induced in the windings of a transformer will a-lag the core flux by 90°. b)-be in-phase with the core flux c)- lead the core flux by 90° d)-be independent of the core flux 5-In a 4-pole, 25kw,200v wave wound dc shunt generator the current in each parallel path will be a)- (62.5A) " b)- (125A). c)- (250A) d)- (31.5A)
-Select the correct answer for the alternatives given. -which of the following does not change in transformer a)-current b)-voltage c)- frequency d)-all of the above 2- The full-load copper loss and iron loss of transformer are 6400w and 5000w respectively. The copper loss and iron loss at half load will be respectively. . a)-(3200 w and 2500 w) b)-(1600 w and 1250 w), c)-(1600 w and 5000w d)- (3200 w and 1250 w) 3-A d.c. shunt motor is running with certain load. The effect of adding an external resistance in field circuit is to a)-reduce the motor speed b) increase the motor speed; c)- stop the motor d)- reduce the armature current of the motor 4- The emf induced in the windings of a transformer will a-lag the core flux by 90°. b)-be in-phase with the core flux c)- lead the core flux by 90° d)-be independent of the core flux 5-In a 4-pole, 25kw,200v wave wound dc shunt generator the current in each parallel path will be a)- (62.5A) " b)- (125A). c)- (250A) d)- (31.5A)
Power System Analysis and Design (MindTap Course List)
6th Edition
ISBN:9781305632134
Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Chapter3: Power Transformers
Section: Chapter Questions
Problem 3.9P
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