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 Basic Electrical  Capacitors and Capacitance  Inductance in a DC Circuit  Electromagnetism  Alternating Voltage and Current  Resonance  Magnetic Circuits  Single Phase Series Circuits  Simple DC Networks  Network Theorems  Circuit Theory  Single-Phase Parallel Networks

Network Theorems on Electrical Engineering related Questions and Answers - Page 2

Question 11 : The maximum power is delivered to a circuit when source resistance is __________ load resistance.
1. Greater than
2. Equal to
3. Less than
4. Greater than or equal to
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Question 13 : 19 ohm
b) 33 ohm, 18.67 ohm, 3.19 ohm
c) 33 ohm, 19.67 ohm, 3.19 ohm
d) 34 ohm, 19.67 ohm, 3.19 ohm
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Answer: a
Explanation: Using the formula for delta to star conversion:
Using the formula for delta to star conversion:
R1=1+2+1*2/(32/3)
R2=1+32/3+1*(32/3)/2
R3=2+32/3+2*(32/3)/1.

9. If an 8/9ohm, 4/3ohm and 2/3ohm resistor is connected in star, find its delta equivalent.
1. 4ohm, 3ohm, 2ohm
2. 1ohm, 3ohm, 2ohm
3. 4ohm, 1ohm, 2ohm
4. 4ohm, 3ohm, 1ohm
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Question 14 : 38 ohm
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Answer: d
Explanation: The 3 2ohm resistors are connected in star, changing them to delta, we have R1=R2=R3= 2+2+2*2/2=6 ohm.
The 3 6ohm resistors are connected in parallel to the 10 ohm 5 ohm and 10ohm resistors respectively.
This network can be further reduced to a network consisting of a 3.75ohm and 2.73ohm resistor connected in series whose resultant is intern connected in parallel to the 3.75 ohm resistor.

4. Delta connection is also known as____________
1. Y-connection
2. Mesh connection
3. Either Y-connection or mesh connection
4. Neither Y-connection nor mesh connection
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Question 15 : If a 4ohm, 3ohm and 2ohm resistor is connected in delta, find the equivalent star connection.
1. 8/9ohm, 4/3ohm, 2/3ohm
2. 8/9ohm, 4/3ohm, 7/3ohm
3. 7/9ohm, 4/3ohm, 2/3ohm
4. 8/9ohm, 5/3ohm, 2/3ohm
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Question 16 : If a 6 ohm, 2ohm and 4ohm resistor is connected in delta, find the equivalent star connection.
1. 1ohm, 2ohm, 3ohm
2. 2ohm, 4ohm, 7ohm
3. 5ohm, 4ohm, 2ohm
4. 1ohm, 2ohm, 2/3ohm
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Question 17 : Rab is the resistance between the terminals A and B, Rbc between B and C and Rca between C and A. These 3 resistors are connected in delta connection. After transforming to star, the resistance at C will be?
1. Rac/(Rab+Rbc+Rca)
2. Rab/(Rab+Rbc+Rca)c) Rbc*Rac/(Rab+Rbc+Rca)d) Rab/(Rab+Rbc+Rca)
3.
4.
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Question 18 : Rab is the resistance between the terminals A and B, Rbc between B and C and Rca between C and A. These 3 resistors are connected in delta connection. After transforming to star, the resistance at B will be?
1. Rac/(Rab+Rbc+Rca)
2. Rab/(Rab+Rbc+Rca)c) Rbc*Rab/(Rab+Rbc+Rca)d) Rab/(Rab+Rbc+Rca)
3.
4.
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Question 19 : Rab is the resistance between the terminals A and B, Rbc between B and C and Rca between C and A. These 3 resistors are connected in delta connection. After transforming to star, the resistance at A will be?
1. Rab*Rac/(Rab+Rbc+Rca)
2. Rab/(Rab+Rbc+Rca)c) Rbc*Rac/(Rab+Rbc+Rca)d) Rac/(Rab+Rbc+Rca)
3.
4.
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