Thevenin’s Theorem Free MCQ Practice Test with Solutions

Test: Thevenin’s Theorem - Question 1

Calculate the Thevenin resistance across the terminal AB for the following circuit.

A.
4.34 ohm
B.
3.67 ohm
C.
3.43 ohm
D.
2.32 ohm

Detailed Solution: Question 1

Thevenin resistance is found by opening the circuit between the specified terminal and shorting all voltage sources.
When the 10V source is shorted, we get:
Rth=(1||2)+3=3.67 ohm.

Test: Thevenin’s Theorem - Question 2

Calculate Vth for the given circuit.

A.
5.54V
B.
3.33V
C.
6.67V
D.
3.67V

Detailed Solution: Question 2

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Test: Thevenin’s Theorem - Question 3

Calculate the current across the 4 ohm resistor.

A.
0.86A
B.
1.23A
C.
2.22A
D.
0.67A

Detailed Solution: Question 3

Thevenin resistance is found by opening the circuit between the specified terminal and shorting all voltage sources.
When the 10V source is shorted, we get:
Rth=(1||2)+3=3.67 ohm.
Vth is calculated by opening the specified terminal.
Using voltage divider, Vth= 2*10/(2+1)=6.67V.
On drawing the Thevenin equivalent circuit, we get Rth, 4 ohm and Vth in series.
Applying ohm’s law, I=Vth/(4+Rth)= 0.86A.

Test: Thevenin’s Theorem - Question 4

The Thevenin voltage is the__________

A.
Open circuit voltage
B.
Short circuit voltage
C.
Both open circuit and short circuit voltage
D.
Neither open circuit nor short circuit voltage

Detailed Solution: Question 4

Thevenin voltage is the open circuit voltage. It is the voltage across the specified terminals. It is not the short circuit voltage because short circuit voltage is equal to zero.

Test: Thevenin’s Theorem - Question 5

Thevenin resistance is found by ________

A.
Shorting all voltage sources
B.
Opening all current sources
C.
Shorting all voltage sources and opening all current sources
D.
Opening all voltage sources and shorting all current sources

Detailed Solution: Question 5

Current sources have infinite internal resistance hence behave like an open circuit whereas ideal voltage sources have 0 internal resistance hence behave as a short circuit.

Test: Thevenin’s Theorem - Question 6

Thevenin’s theorem is true for __________

A.
Linear networks
B.
Non-Linear networks
C.
Both linear networks and nonlinear networks
D.
Neither linear networks nor non-linear networks

Detailed Solution: Question 6

Thevenin’s theorem works for only linear circuit elements and not non-linear ones such as BJT, semiconductors etc.

Test: Thevenin’s Theorem - Question 7

In Thevenin’s theorem Vth is__________

A.
Sum of two voltage sources
B.
A single voltage source
C.
Infinite voltage sources
D.
0

Detailed Solution: Question 7

Thevenin’s theorem states that a combination of voltage sources, current sources and resistors is equivalent to a single voltage source V and a single series resistor R.

Test: Thevenin’s Theorem - Question 8

Vth is found across the ____________ terminals of the network.

A.
Input
B.
Output
C.
Neither input nor output
D.
Either input or output

Detailed Solution: Question 8

According to Thevenin’s theorem, Vth is found across the output terminals of a network and not the input terminals.

Test: Thevenin’s Theorem - Question 9

Can we use Thevinin’s theorem on a circuit containing a BJT?

A.
Yes
B.
No
C.
Depends on the BJT
D.
Insufficient data provided

Detailed Solution: Question 9

We can use Thevenin’s theorem only for linear networks. BJT is a non-linear network hence we cannot apply Thevenin’s theorem for it.

Test: Thevenin’s Theorem - Question 10

A Thevenin equivalent source comprises of which of the following elements?

A.
A single current source in parallel with a resistance
B.
A single current source in series with a resistance
C.
A single voltage source in series with a resistance
D.
A single voltage source in parallel with a resistance

Detailed Solution: Question 10

Thevenin Equivalent Source:

Thevenin's theorem states that any linear electrical network with voltage and current sources and resistances can be replaced at a pair of terminals by an equivalent voltage source (V_th) in series with an equivalent resistance (R_th).

This means the Thevenin equivalent source is characterized by:

A single voltage source (V_th)
A single series resistance (R_th)

Therefore, the correct description of a Thevenin equivalent source is: A single voltage source in series with a resistance

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