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## If source impedance is complex, then maximum power transfer occurs when the load impedance is _______ the source impedance.

If source impedance is complex, then maximum power transfer occurs when the load impedance is _______ ... of (d) negative of complex conjugate of

## If source impedance is complex, then maximum power transfer occurs when the load impedance is _______ the source impedance.

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## [Solved] In case of ac circuit if source impedance is (R + jX) maximu

Maximum power transfer theorem for AC circuits: The maximum power transfer theorem states that the maximum power flow through an AC circuit will occur when&nbs

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## In case of ac circuit if source impedance is (R + jX) maximum power transfer occurs when load impedance is:

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NBCC JE Electrical 29 Oct 2017 Official Paper

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12(R+jX) R - jX R + jX None of these

## Answer (Detailed Solution Below)

Option 2 : R - jX

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## Detailed Solution

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Maximum power transfer theorem for AC circuits:

The maximum power transfer theorem states that the maximum power flow through an AC circuit will occur when the load impedance is equal to the complex conjugate of the source impedance as viewed from its output terminals.

When the load impedance matches the Thevenin equivalent resistance of the given circuit, maximum power is transferred to it. i.e.

If RL = Rth, Maximum power is transferred to the Load.

ZL = ZS* |ZL| = |ZS|

**Explanation:**

Zs = R + jX

For maximum power transfer

ZL = ZS* = (R + jX)* = R - jX

Load variable

The load impedance for maximum power transfer

RL and XL are variable

RL = RS XL = -XS ZL = ZS* RL only varied and XL = Constant

RL =√(RS2 + (XL + XS)2)

RL only varied and XL = 0 RL =√(RS2 + XS2)

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## More Maximum Power Transfer Theorem Questions

**Q1.**The maximum power drawn by the load RL in the above circuit will be

**Q2.**A dc circuit is Thevenized and found to have parameters as 25Ω and 10V. What will be the maximum power transferred to the load?

**Q3.**In the lattice network, the value of RL for the maximum power transfer to it is

**Q4.**Given condition justifies which network theorems: The load impedance should be complex conjugate of the internal impedance of the active network.

**Q5.**In case of max power transfer voltage drop across RL is:

**Q6.**In case of ac circuit if source impedance is (R + jX) maximum power transfer occurs when load impedance is:

**Q7.**In maximum power transfer theorem, load RL will draw maximum power when:

**Q8.**For what value of resistance across terminal A-B, the power transfer will be maximum?

**Q9.**Calculate the value of R to be connected across A - B for maximum power transfer.

**Q10.**In the circuit, the maximum power that can be transferred to Load ZL is

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**Q1.**Find the Thevenin resistance (Rth) across MN for the above circuit.

**Q2.**Find the current I in the above circuit

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**Q5.**_____ cannot be applied to circuits containing _____.

**Q6.**In the given circuit, viewed from AB, the circuit can be reduced to an equivalent circuit as:

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## Maximum Power Transfer Theorem

This set of Network Theory Multiple Choice Questions & Answers (MCQs) focuses on “Maximum Power Transfer Theorem”. 1. The maximum power is delivered from a source to its load when the load resistance is ______ the source resistance. a) greater than b) less than c) equal to d) less than or equal to 2. If ... Read more

## Network Theory Questions and Answers – Maximum Power Transfer Theorem

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This set of Network Theory Multiple Choice Questions & Answers (MCQs) focuses on “Maximum Power Transfer Theorem”.

1. The maximum power is delivered from a source to its load when the load resistance is ______ the source resistance.

a) greater than b) less than c) equal to

d) less than or equal to

View Answer

2. If source impedance is complex, then maximum power transfer occurs when the load impedance is _______ the source impedance.

a) equal to b) negative of

c) complex conjugate of

d) negative of complex conjugate of

View Answer

3. If the source impedance is complex, then the condition for maximum power transfer is?

a) ZL = ZS b) ZL = ZS* c) ZL = -ZS d) ZL = -ZS* View Answer

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4. If ZL = ZS*, then?

a) RL = 1 b) RL = 0 c) RL = -RS d) RL = RS View Answer

5. For ZL = ZS*, the relation between XL and XS is?

a) XL = XS b) XL = 0 c) XL = 1 d) XL = -XS View Answer

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6. In the circuit shown below, find the value of load impedance for which source delivers maximum power.

a) 15-j20 b) 15+j20 c) 20-j15 d) 20+j15 View Answer

7. What is the load current in the following circuit?

a) 1.66∠90⁰ b) 1.66∠0⁰ c) 2.66∠0⁰ d) 2.66∠90⁰ View Answer advertisement

8. The maximum power delivered by the source in the below circuit shown?

a) 39.33 b) 40.33 c) 41.33 d) 42.33 View Answer

9. For the circuit shown, the resistance R is variable from 2Ω to 50Ω. What value of RS results in maximum power transfer across terminals ‘ab’.

a) 1 b) 2 c) 3 d) 4 View Answer advertisement

10. Find the maximum power delivered by the source in the following circuit.

a) 96.6 b) 97.6 c) 98.6 d) 99.6 View Answer

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