1.2 Theorem MCQ

License Preparation NepalNEC ELECTRONICS

Full marks: 26 · Questions: 26

01Superposition Theorem

In superposition theorem, when we consider the effect of one voltage source, all the other voltage sources are ____________

Shorted

Opened

Removed

Undisturbed

02Superposition Theorem

In superposition theorem, when we consider the effect of one current source, all the other voltage sources are ____________

Shorted

Opened

Removed

Undisturbed

03Superposition Theorem

In superposition theorem, when we consider the effect of one voltage source, all the other current sources are ____________

Shorted

Opened

Removed

Undisturbed

04Superposition Theorem

In a circuit with a 16V source in series with a 20Ω resistor, in parallel with a 3A current source, a 10V DC source, an 80Ω resistor, and a 15A current source, find the value of Vx across the 20Ω resistor due to the 16V source alone:

46.8V

3.2V

2.3V

6.3V

05Superposition Theorem

Superposition theorem is valid for _________

Linear systems

Non-linear systems

Both linear and non-linear systems

Neither linear nor non-linear systems

06Superposition Theorem

Superposition theorem does not work for ________

Current

Voltage

Power

none of the above

07Thevenin's Theorem

Find the Thevenin resistance across the terminal AB for a circuit with a 10V source in series with 1Ω, parallel with 2Ω, and connected in series with 3Ω to terminal A, with terminal B at reference:

4.34 ohm

3.67 ohm

3.43 ohm

2.32 ohm

08Thevenin's Theorem

Calculate Vth across terminals AB for the circuit with a 10V source, 1Ω and 2Ω voltage divider, 3Ω series resistor, and 4Ω load across AB:

5.54V

3.33V

6.67V

3.67V

09Thevenin's Theorem

The Thevenin voltage is the__________

Open circuit voltage

Short circuit voltage

Open circuit and short circuit voltage

Neither open circuit nor short circuit voltage

10Thevenin's Theorem

Thevenin resistance is found by ________

Shorting all voltage sources

Opening all current sources

Shorting all voltage sources and opening all current sources

Opening all voltage sources and shorting all current sources

11Thevenin's Theorem

Which of the following is also known as the dual of Thevenin's theorem?

Norton's theorem

Superposition theorem

Maximum power transfer theorem

Millman's theorem

12Thevenin's Theorem

Can we use Thevenin's theorem on a circuit containing a BJT?

Yes

Depends on the type BJT

Depend on source

13Norton's Theorem

The Norton current is the_______

Short circuit current

Open circuit current

Open circuit and short circuit current

Neither open circuit nor short circuit current

14Norton's Theorem

Norton resistance is found by?

Shorting all voltage sources

Opening all current sources

Shorting all voltage sources and opening all current sources

Opening all voltage sources and shorting all current sources

15Norton's Theorem

Norton's theorem is true for __________

Linear networks

Non-Linear networks

Both linear networks and nonlinear networks

Neither linear networks nor non-linear networks

16Norton's Theorem

Calculate the Norton resistance for the circuit with a 10V source, 3Ω and 6Ω parallel combination, a 1A current source, and a 10Ω series resistor if 5Ω is the load resistance across terminals AB:

10 ohm

11 ohm

12 ohm

13 ohm

17Norton's Theorem

Find the current in the 5 ohm load resistance using Norton's theorem for the circuit with 10V source, 3Ω resistor, 6Ω resistor, 1A current source, and 10Ω series resistor:

1.5A

0.25A

0.5A

18Norton's Theorem

If Vth = 3v and Rth = 7 ohm, then the value of Norton's Current and resistance are:

7/3A, 21ohm

21A, 7/3 ohm

21 A, 7 ohm

3/7 A, 7 ohm

19Maximum Power Transfer Theorem

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

greater than

less than

equal to

less than or equal to

20Maximum Power Transfer Theorem

The maximum power drawn from a source depends on __________

Value of source resistance

Value of load resistance

Both source and load resistance

Neither source or load resistance

21Maximum Power Transfer Theorem

Does maximum power transfer imply maximum efficiency?

Yes

Sometimes

Cannot be determined

22Maximum Power Transfer Theorem

Under the condition of maximum power transfer, the efficiency is:

100%

30%

50%

23Maximum Power Transfer Theorem

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

Amplifiers

Communication circuits

Both amplifiers and communication circuits

Neither amplifiers nor communication circuits

24Maximum Power Transfer Theorem

In a bridge network between terminals A and B with a 10V source connected to parallel branches 3Ω and 2Ω, and a 20V source connected to branches 4Ω and 3Ω, what should be the load resistance across AB so that maximum power is delivered?

3 ohm

2.91 ohm

2 ohm

3.91 ohm

25Maximum Power Transfer Theorem

For the network with 10V source (3Ω, 2Ω) and 20V source (4Ω, 3Ω), what should be the maximum power dissipated across AB?

1.79W

4.55W

5.67W

3.78W

26Maximum Power Transfer Theorem

Which theorem is particularly useful for analysing communication networks?

Millman's Theorem

Thevenin's Theorem

Superposition Theorem

Maximum Power Transfer Theorem