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Test: Maximum Power Transfer - Electrical Engineering (EE) MCQ


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10 Questions MCQ Test - Test: Maximum Power Transfer

Test: Maximum Power Transfer for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) preparation. The Test: Maximum Power Transfer questions and answers have been prepared according to the Electrical Engineering (EE) exam syllabus.The Test: Maximum Power Transfer MCQs are made for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Maximum Power Transfer below.
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Test: Maximum Power Transfer - Question 1

The maximum power drawn from source depends on__________

Detailed Solution for Test: Maximum Power Transfer - Question 1

The maximum power transferred is equal to:
I2RL, when load resistance is variable.
Es2/4RL, when load impedance is variable.
In both the cases, the maximum power depends on the load resistance.

Test: Maximum Power Transfer - Question 2

 The maximum power is delivered to a circuit when source resistance is __________ load resistance.

Detailed Solution for Test: Maximum Power Transfer - Question 2

The circuit can draw maximum power only when source resistance is equal to the load resistance.

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Test: Maximum Power Transfer - Question 3

 If source impedance is a complex number Z, then load impedance is equal to _________

Detailed Solution for Test: Maximum Power Transfer - Question 3

When Source impedance is equal to Z, its load impedance is the complex conjugate of Z which is Z’. Only under this condition maximum power can be drawn from the circuit.

Test: Maximum Power Transfer - Question 4

If ZL=Zs’, then RL=?

Detailed Solution for Test: Maximum Power Transfer - Question 4

Rs is the real part of the complex number ZL. Hence when we find the complex conjugate the real part remains the same whereas the complex part acquires a negative sign.

Test: Maximum Power Transfer - Question 5

 

Calculate the value of RL across A and B.

Detailed Solution for Test: Maximum Power Transfer - Question 5

 On shorting the voltage sources:
RL=3||2+4||5.

Test: Maximum Power Transfer - Question 6

Calculate Vba.​

Detailed Solution for Test: Maximum Power Transfer - Question 6

The two nodal equations are:
(VA-10)/3+VA/2=0
(VB-20)/4+VB/3=0
On solving the two equations, we get VA=4V, VB=8.571V.
Vba=VA-VB= 4.57V.

Test: Maximum Power Transfer - Question 7

Calculate the maximum power transferred.

Detailed Solution for Test: Maximum Power Transfer - Question 7

Correct Answer :- a

Explanation : On shorting the voltage sources:

RL = 3||2+4||3 

= 1.20 + 1.71

= 2.91 ohm.

The two nodal equations are:

(VA-10)/3 + VA/2 = 0

(VB-20)/4 + VB/3 = 0

On solving the two equations, we get VA=4V, VB=8.571V.

VAB = VA - VB 

= 4V – 8.571V 

= -4.57V.

Eth = 4.57V

The maximum power transferred = Eth2/4RL. Substituting the given values in the formula, we get Pmax = 1.79W

Test: Maximum Power Transfer - Question 8

Does maximum power transfer imply maximum efficiency?

Detailed Solution for Test: Maximum Power Transfer - Question 8

Maximum power transfer does not imply maximum efficiency. If the load resistance is smaller than source resistance, power dissipated at the load is reduced while most of the power is dissipated at the source then the efficiency becomes lower.

Test: Maximum Power Transfer - Question 9

 Under the condition of maximum power efficiency is?

Detailed Solution for Test: Maximum Power Transfer - Question 9

Efficiency=output/input*100.
Under maximum power conditions:
Output=I2RL; Input=2*I2RL.
Thus efficiency=50%.

Test: Maximum Power Transfer - Question 10

Name some devices where maximum power has to be transferred to the load rather than maximum efficiency.

Detailed Solution for Test: Maximum Power Transfer - Question 10

 Maximum power transfer to the load is preferred over maximum efficiency in both amplifiers and communication circuits since in both these cases the output voltage is more than the input.

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