-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)

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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