1-A d.c. shunt motor is running with certain load. The effect of adding an external resistance 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 2- The copper loss and iron loss of transformer at half load are 1600 w and 5000w respectively. The copper loss and iron loss at full load will be respectively. a)-(3200 w and 10000w), b)- (6400 w and 5000 w), c)- (6400 w and 10000w), d)-(3200 w and 1250w) 3- The secondary winding of which of the following transformer is always kept close a)-power transformer d)-distribution transformer b)- auto-transformer, c)- current transformer,

1-A d.c. shunt motor is running with certain load. The effect of adding an external resistance 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 2- The copper loss and iron loss of transformer at half load are 1600 w and 5000w respectively. The copper loss and iron loss at full load will be respectively. a)-(3200 w and 10000w), b)- (6400 w and 5000 w), c)- (6400 w and 10000w), d)-(3200 w and 1250w) 3- The secondary winding of which of the following transformer is always kept close a)-power transformer d)-distribution transformer b)- auto-transformer, c)- current transformer,

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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1. A 2.4 kVA single phase ideal transformer has 150 turns on the primary and 75 turns on the secondary winding. The primary is connected to 200 V, 50 Hz supply, find: i) The full load primary and secondary currents. ii) The primary and secondary EMF per turn. ii) The maximum magnetic flux in the core.
A transformer core is laminated in order to ....................................? (A) reduce hysteresis loss and eddy current loss (B) reduce only hysteresis loss (C) reduce copper loss (D) reduce all of the above losses (E) None of the above.
The efficiency of a transformer will be maximum when ........................? (A) copper losses = hysteresis losses (B) hysteresis losses = eddy current losses (C) eddy current losses = copper losses (D) copper losses = hysteresis losses plus eddy current losses (E) None of the above.
Q2/ Fill in the blanks: 1- The two windings of a transformer is linked. ***** 2- If a transformer primary is energized from a square wave voltage source, its output voltage will be.......... 3- The primary winding of a 220/6 V, 50 Hz transformer is energized from 110 V, 60 Hz supply. The secondary output voltage will be ...... V.
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The turns ratio of a particular transformer is less than 1. Where would you expect to see this type of transformer? OI. A 0 0 0 0 0 Power Plant K Generation II. A and B III. B IV. B and C V. C VI. C and A A Station High-Voltage Power Lines Transmission B Substation C Distribution Power Lines ( .00 Industrial Consumer Commercial Consumer Residential Consumer Distribution
4. The portion of the flux that goes through one of the transformer coils but not the other one is called. A) Average flux B) Mutual flux D) Leakage flux C) Total flux 5. The fundamental component of the magnetization current ------- the voltage applied to the core by ------ 90°: A) Lags, 45° B) Leads, 45°. D). Leads, 90°. C) Lags, 90°. 6. The ----- are resistive heating losses in the core of the transformer. A) Hysteresis losses. B) Copper losses. C) Leakage flux losses. D) Eddy current losses. 7. The total rotational losses of an induction motor are a combination of: A) Friction losses B) Windage losses. C) Core losses. D) Stray losses. 8. Induction motors are now the preferred A) absence of brushes. choice for industrial motors due to B) Small size. C) Less control requirements. D) rugged construction. 9. For an induction motor, if the synchronous speed is 1800 r/m, and the rotor speed 180rad/sec, then the slip will be: A) 5.5 % C) 6% B) 4.5% D) 4% 10. The lower the speed of an…
The cross-sectional area of a transformer limb is 80 cm² and the volume of the transformer core is 5000 cm³. The maximum value of the core flux is 10 mWb at a frequency of 50 Hz. Taking the Steinmetz constant as 1.7, the hysteresis loss is found to be 100 W. Determine the value of the hysteresis loss when the maximum core flux is 8 mWb and the frequency is 50 Hz.
calculate the iron loss P; and copper loss Peu of each transformer for full load condition.
In a practical transformer, Identify, which component of no load current supplies eddy current loss? a. I0 b. IC c. IM d. None of these