Choose the correct answer of the following questions: 1. If the secondary power of a transformer is increased by 50% then the magnetic flux (p) passing in the magnetic core will: a. Increase by 50% c. Increases by 25% b. Decreases by 50% d. None of the above 2. In a A-Y connection three-phase transformer of K turn ratio, the secondary line voltage is: a. VL2 =VL1 b. V₁2 = VL1 c. VL2 = KVL1 d. V₁2 = VL1 3. Two 400kVA single-phase transformers work as V-V (open-delta) connection, supply a 1200 kVA load. The kVA supplied by each transformer is: a. 400kVA of each b. Sharing the load equally d. 300kVA of each c. 693kVA of each 4. In an auto-transformer of K transformation ratio, the power transferred inductively from the primary side to the secondary side is equal to: a. P = (1-K) Pin b. P = (K) Pin d. P = K² Pin c. P = (1+K) Pin 5. In a single-phase transformer, the percentage resistance drops is 1.0% and percentage reactance drop is 5.0%, the percentage voltage regulation when the power factor 0.8 leading is: a. 3% b. -2.2% d. 3.8% c. -3.4%
Choose the correct answer of the following questions: 1. If the secondary power of a transformer is increased by 50% then the magnetic flux (p) passing in the magnetic core will: a. Increase by 50% c. Increases by 25% b. Decreases by 50% d. None of the above 2. In a A-Y connection three-phase transformer of K turn ratio, the secondary line voltage is: a. VL2 =VL1 b. V₁2 = VL1 c. VL2 = KVL1 d. V₁2 = VL1 3. Two 400kVA single-phase transformers work as V-V (open-delta) connection, supply a 1200 kVA load. The kVA supplied by each transformer is: a. 400kVA of each b. Sharing the load equally d. 300kVA of each c. 693kVA of each 4. In an auto-transformer of K transformation ratio, the power transferred inductively from the primary side to the secondary side is equal to: a. P = (1-K) Pin b. P = (K) Pin d. P = K² Pin c. P = (1+K) Pin 5. In a single-phase transformer, the percentage resistance drops is 1.0% and percentage reactance drop is 5.0%, the percentage voltage regulation when the power factor 0.8 leading is: a. 3% b. -2.2% d. 3.8% c. -3.4%
Introductory Circuit Analysis (13th Edition)
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ISBN:9780133923605
Author:Robert L. Boylestad
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Chapter1: Introduction
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KVL and KCL
KVL stands for Kirchhoff voltage law. KVL states that the total voltage drops around the loop in any closed electric circuit is equal to the sum of total voltage drop in the same closed loop.
Sign Convention
Science and technology incorporate some ideas and techniques of their own to understand a system skilfully and easily. These techniques are called conventions. For example: Sign conventions of mirrors are used to understand the phenomenon of reflection and refraction in an easier way.
Question
i need the last 2 (4+5)
![Choose the correct answer of the following questions:
1. If the secondary power of a transformer is increased by 50% then the magnetic flux
(p) passing in the magnetic core will:
a. Increase by 50%
c. Increases by 25%
b. Decreases by 50%
d. None of the above
2. In a A-Y connection three-phase transformer of K turn ratio, the secondary line
voltage is:
a. VL2 =VL1
b. V₁2
=
VL1
c. VL2 = KVL1
d. V₁2 = VL1
3. Two 400kVA single-phase transformers work as V-V (open-delta) connection, supply
a 1200 kVA load. The kVA supplied by each transformer is:
a.
400kVA of each
b. Sharing the load equally
d. 300kVA of each
c. 693kVA of each
4. In an auto-transformer of K transformation ratio, the power transferred inductively
from the primary side to the secondary side is equal to:
a. P = (1-K) Pin
b. P = (K) Pin
d. P = K² Pin
c. P = (1+K) Pin
5. In a single-phase transformer, the percentage resistance drops is 1.0% and percentage
reactance drop is 5.0%, the percentage voltage regulation when the power factor 0.8
leading is:
a. 3%
b. -2.2%
d. 3.8%
c. -3.4%](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F4126c8d8-538b-4ef2-b4b4-014b373fa0dd%2F3edd22b4-b175-48f1-aae5-071ffd5820d8%2F3ts6heh_processed.png&w=3840&q=75)
Transcribed Image Text:Choose the correct answer of the following questions:
1. If the secondary power of a transformer is increased by 50% then the magnetic flux
(p) passing in the magnetic core will:
a. Increase by 50%
c. Increases by 25%
b. Decreases by 50%
d. None of the above
2. In a A-Y connection three-phase transformer of K turn ratio, the secondary line
voltage is:
a. VL2 =VL1
b. V₁2
=
VL1
c. VL2 = KVL1
d. V₁2 = VL1
3. Two 400kVA single-phase transformers work as V-V (open-delta) connection, supply
a 1200 kVA load. The kVA supplied by each transformer is:
a.
400kVA of each
b. Sharing the load equally
d. 300kVA of each
c. 693kVA of each
4. In an auto-transformer of K transformation ratio, the power transferred inductively
from the primary side to the secondary side is equal to:
a. P = (1-K) Pin
b. P = (K) Pin
d. P = K² Pin
c. P = (1+K) Pin
5. In a single-phase transformer, the percentage resistance drops is 1.0% and percentage
reactance drop is 5.0%, the percentage voltage regulation when the power factor 0.8
leading is:
a. 3%
b. -2.2%
d. 3.8%
c. -3.4%
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