Circuit Theorems In Ac Analysis MCQs

Question 1

In order to get maximum power transfer from a capacitive source, the load must

Accepted Answer

Have an impedance that is the complex conjugate of the source impedance

Answer

Have a capacitive reactance equal to circuit resistance

Answer

Be as capacitive as it is inductive

Answer

None of the above

Question 2

In applying the superposition theorem,

Accepted Answer

The sources are considered one at a time with all others replaced by their internal impedance

Answer

All sources are considered independently

Answer

All sources are considered simultaneously

Answer

The sources are considered one at a time with all others replaced by their internal resistance

Question 3

The Norton equivalent current is

Accepted Answer

The short circuit current

Answer

The current through the load

Answer

The open-current from the source

Answer

None of the above

Question 4

Norton's theorem provides a method for the reduction of any ac circuit to an equivalent form consisting of an equivalent voltage source in series with an equivalent impedance.

Accepted Answer

False

Answer

True

Question 5

Thevenin's theorem provides a method for the reduction of any ac circuit to an equivalent form consisting of an equivalent current source in parallel with an equivalent impedance.

Accepted Answer

False

Answer

True

Question 6

The Thevenin equivalent voltage is

Accepted Answer

The open circuit voltage

Answer

Equal to the source voltage

Answer

The same as the load voltage

Answer

None of the above

Question 7

If two currents are in the same direction at any instant of time in a given branch of a circuit, the net current at that instant

Accepted Answer

Is the sum of the two currents

Answer

Is zero

Answer

Is the difference between the two currents

Answer

Cannot be determined

Question 8

Norton's theorem gives

Accepted Answer

An equivalent current source in parallel with an equivalent impedance

Answer

An equivalent current source in series with an equivalent impedance

Answer

An equivalent voltage source in parallel with an equivalent impedance

Answer

An equivalent voltage source in series with an equivalent impedance

Question 9

Referring to the given circuit, what is ZTH if R1 is changed to 220 Ω?

Accepted Answer

46 ∠77.9° Ω

Answer

225 ∠12.1° Ω

Answer

225 ∠77.9° Ω

Answer

46 ∠12.1° Ω