Virtual Labs

A system which follows the superposition principle is known as-

a: System b: Control system c: Linear system d: Unilateral system

In applying superposition theorem, to determine branch current and voltages-

a: All current and voltage sources are shorted b: Only current sources are open-circuited c: Only voltage sources are shorted d: Voltage source are shorted and current sources are open- circuited

Superposition theorem is applicable to-

a: Current only b: Voltage only c: Both current and voltage d: Current, voltage and power

In electrical circuits states that for a response (voltage and current) in any branch of a bilateral linear circuit having more than one independent source equals the algebraic sum of the responses caused by each source acting alone-

a: Norton’s theorem b: Thevenin’s theorem c: Superposition theorem d: Dulity theorem

A linear circuit contains ideal resistors and ideal voltage source. If values of all the resistors are halved then the voltage across resistor becomes-

a: Half b: Doubled c: Remained unchanged d: Decreased by 4 times

The Norton current is the_______

a: Short circuit current b: Open circuit current c: Open circuit and short circuit current d: Neither open circuit nor short circuit current

Norton 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

Isc is found across the ____________ terminals of the network.

a: Input b: Output c: Neither input nor output d: Either input or output

Find the Norton resistance for the given circuit if 5 ohm is the load resistance?

Find the current in the 5 ohm resistance using Norton’s theorem?

In maximum power transfer theorem internal resistance must be-

a: Greater than the internal resistance b: Equal to zero c: Equal to the load resistance d: Equal to the internal resistance

What is the maximum power transferred to a load for a resistive thevenin’s circuit and condition for which is occurs?

a: Pmax=(4V²_th)/(R_th) and R_L=R_th
b: Pmax=(V²_th)/(4R_th) and R_L=R_th
c: Pmax=(V²_th)/(2R_th) and R_L=(R_th)/2
d: Pmax=(2V²_th)/(R_th) and R_L=2R_th

Under the condition of maximum power efficiency is -

Does maximum power transfer imply maximum efficiency?

a: Yes b: No c: Sometimes d: Cannot be determined

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

a: Amplifiers b: Communication circuits c: Both amplifiers and communication circuits d: Neither amplifiers nor communication circuits

The application of Thevenin’s theorem in a circuit result is -

a: An ideal voltage source b: An ideal current source c: A current source and impedance in parallel d: A voltage source and impedance in series

Thevenin’s theorem cannot be applied to -

a: Linear circuit b: Non-linear circuit c: Active circuit d: Passive circuit

For a network, Thevenin equivalent is given by V_TH = 10 V and R_TH = 50 ohms. If this network is shunted by another 50 ohm at load. What is the new Thevenin equivalent of the network?

a: 5V, 50ohm b: 5V, 25ohm c: 10V, 50ohm d: 10V, 25ohm

V_TH is found across the ____________ terminals of the network.

a: Input b: Output c: Neither input nor output d: Either input or output

How the Thevenin’s impedance and Norton impedance are correlated in AC circuit ?

a: Always the same b: Generally, the same c: Sometimes the same d: Always different

To Study and verify the network theorem: