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1. In order to decrease magnetic flux of the air gap for the same current of the coil, one should: a. Select material with higher permeability b. Select material with higher relative permeability c. Decrease the length of the air gap d. All of the above e. None of the above 2. A coil with its core being made from wood, a. It has copper losses b. It has hysteresis losses c. a and b d. none of the above 3. If a power transformer is supplied from AC voltage source. If the secondary current is zero, then for this transformer: a. The primary current is equal to zero b. The core loss is equal to zero c. The copper loss is equal to zero d. a and b e. band c f. none of the above 4. If a power transformer is supplied from a DC voltage source, then a. The magnetic field in the core is zero b. Secondary voltage is proportional to primary voltage c. Primary current is zero d. a and c e. All of the above f. None of the above

1. In order to decrease magnetic flux of the air gap for the same current of the coil, one should: a. Select material with higher permeability b. Select material with higher relative permeability c. Decrease the length of the air gap d. All of the above e. None of the above 2. A coil with its core being made from wood, a. It has copper losses b. It has hysteresis losses c. a and b d. none of the above 3. If a power transformer is supplied from AC voltage source. If the secondary current is zero, then for this transformer: a. The primary current is equal to zero b. The core loss is equal to zero c. The copper loss is equal to zero d. a and b e. band c f. none of the above 4. If a power transformer is supplied from a DC voltage source, then a. The magnetic field in the core is zero b. Secondary voltage is proportional to primary voltage c. Primary current is zero d. a and c e. All of the above f. None of the above

Introductory Circuit Analysis (13th Edition)
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. In order to decrease magnetic flux of the air gap for the same current of the coil, one should: a. Select material with higher permeability b. Select material with higher relative permeability c. Decrease the length of the air gap d. All of the above e. None of the above 2. A coil with its core being made from wood, a. It has copper losses b. It has hysteresis losses c. a and b d. none of the above 3. If a power transformer is supplied from AC voltage source. If the secondary current is zero, then for this transformer: a. The primary current is equal to zero b. The core loss is equal to zero c. The copper loss is equal to zero d. a and b e. band c f. none of the above 4. If a power transformer is supplied from a DC voltage source, then a. The magnetic field in the core is zero b. Secondary voltage is proportional to primary voltage c. Primary current is zero d. a and c e. All of the above f. None of the above
Transcribed Image Text:1. In order to decrease magnetic flux of the air gap for the same current of the coil, one should: a. Select material with higher permeability b. Select material with higher relative permeability c. Decrease the length of the air gap d. All of the above e. None of the above 2. A coil with its core being made from wood, a. It has copper losses b. It has hysteresis losses c. a and b d. none of the above 3. If a power transformer is supplied from AC voltage source. If the secondary current is zero, then for this transformer: a. The primary current is equal to zero b. The core loss is equal to zero c. The copper loss is equal to zero d. a and b e. band c f. none of the above 4. If a power transformer is supplied from a DC voltage source, then a. The magnetic field in the core is zero b. Secondary voltage is proportional to primary voltage c. Primary current is zero d. a and c e. All of the above f. None of the above
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