Section 1 (2) juhä: The open circuit test in a transformer is used to measure.also, keep secondary .... terminals Total loss , short circuit Winding loss , open circuit Core loss, open circuit Copper loss, short circuit ialy ihi The separately excited D.C generator when field resistance increased at no *. load, which one is change Torque Voltage generator Speed generator Load current Li 4 The shunt excited D.C motor when field * resistance increased not decreased increased change The torque will be

Section 1 (2) juhä: The open circuit test in a transformer is used to measure.also, keep secondary .... terminals Total loss , short circuit Winding loss , open circuit Core loss, open circuit Copper loss, short circuit ialy ihi The separately excited D.C generator when field resistance increased at no . load, which one is change Torque Voltage generator Speed generator Load current Li 4 The shunt excited D.C motor when field resistance increased not decreased increased change The torque will be

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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Single phase transformer has transformation ratio 6600/250 , 50 hertz, N2 =50. find maximum magnetic flux?
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(9) The hysteresis losses in electrical machines reduced. a- By core lamination. b- By core isolation. c- By choosing another type of iron. (10) The eddy current losses in electrical machines reduced. d- By core lamination. e- By core isolation. f- By choosing another type of iron.
(5) The saturation in transformer appears: a- At no-load. b- At half-load. c- At full-load. (6) The only parts suffers from eddy currents in DC motors: a- The stator. b- The rotor. c- The stator and rotor.
I am in a hurry, I need the answer as soon as possible, please help.
A 11000/230 V, 150-kVA, 1-phase, 50-Hz transformer has core loss of 1.4 kWand full load copper loss of 1.6 kW. Determine (a) the kVA load for max. efficiency and(b) the value of max. efficiency at unity power factor
4. The portion of the flux that goes through one of the transformer coils but not the other one is called. A) Average flux C) Total flux B) Mutual flux D) Leakage flux 5. The ------- are represented in the induction motor equivalent circuit by the resistor Rc (or the conductance Gc). A) Stray losses. C) Air-gap losses B) Friction and windage losses D) Core losses 6. The per-phase voltage Vo can be calculated by dividing the total voltage on. A) √3 B) √1.404. C) √0.707. D) √2.
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…
UDng a ITIe Core in high frequency transformers. c- Discuss, different applications of iron cores of different hysteresis loops. d- Explain the effect of Inrush current on power transformers.
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QUESTIONS: 1. A 10 kVA, single-phase, 2400-V:120-V, 60 Hz transformer has an equivalent impedance referred to LV side of 0.01 + j0.09 Q. This transformer has a core loss of 100 W at rated voltage. When rated current is applied to the 2400-V winding, the exciting current in that winding is found to be 0.2 A. a. Find the full-load regulation of this transformer at a power factor of 0.8 lagging. b. Find the efficiency of this transformer at full load, 0.8 power factor lagging. c. Ifstandard open-circuit and tests were performed on this transformer, what would be the measured values of these tests? 2. The following data were obtained on a 2.5 MVA, 50-Hz, 19.1-kV:3.81-kV single-phase transformer tested at 50 Hz: Voltage (V) Current (A) Power (kW) LV winding with HV terminals open-circuited: 3810 9.86 8.14 HV winding with LV terminals short-circuited: 920 141 10.3 a. Calculate the cantilever equivalent-circuit parameters as referred to the transformer high-voltage winding. b. Calculate the…