MCQs On Electrical Network Theorem

1) An active element in a circuit is one which _____________

- Receives energy
- Supplies energy
- Both receives and supplies energy
- None of the above

2) A passive element in a circuit is one which ___________

- Receives energy
- Supplies energy
- Both receives and supplies energy
- None of the above

3) A linear circuit is one whose parameter _________

- Changes with change in current
- Changes with change in voltage
- Changes with both voltage and current
- Do not changes with voltage and current

4) The superposition theorem is used when the circuit contains ____________

- A single voltage sources
- A number of voltage sources
- Only passive elements
- None of the above

5) Norton theorem is ______________ thevenin’s theorem.

- The same as
- Converse of
- Cannot say
- None of the above

6) In the analysis of a vacuum tube circuit,we generally use _________ theorem

- Superposition
- Thevinin
- Norton
- Reciprocity

7) Norton theorem is ________ form of an equivalent circuit.

- Both current and voltage
- Current
- Voltage
- None of the above

8) In the analysis of transistor theorem, we usually uses _________ theorem.

- Norton
- Thevinin
- Reciprocity
- Superposition

9) For transfer of maximum power, the relation between load resistance R and internal resistance r of the voltage source is

- R = 2r
- R = 1.5r
- R = r
- R = 0.5r

10) Under the condition of maximum power transfer, the efficiency is

- 100%
- 75%
- 50%
- 25%

11) The open circuited voltage at the transfer of load R is 30 V. Under the condition of maximum load power transfer, the load voltage will be _________

- 30 V
- 15 V
- 10 V
- 5 V

12) The output resistance of a voltage source is 4 Ω. Its internal resistance will be

- 4 Ω
- 2 Ω
- 1 Ω
- Infinite

13) Star/Delta or Delta/Star technique is applied to ________ network

- One terminal
- Two terminal
- Three terminal
- None of the above

14) The resistor value in delta network that is equivalent to a wye containing three 120 Ω resistors is

- 360 Ω
- 240 Ω
- 180 Ω
- 120 Ω

15) The resistor values in wye network that is equivalent to a delta containing three 12 kΩ resistor is

- 2 kΩ
- 4 kΩ
- 8 kΩ
- 36 kΩ

16) A voltage source has a terminal voltage of 28 V when its terminal are open circuited. When a load of 12 Ω is applied across it terminal, the voltage drops to 24 V. Find the internal resistance of source

- 0.5 Ω
- 1 Ω
- 2 Ω
- 2.5 Ω

17) What percentage of the maximum power is delivered to a load if load resistance is 10 times greater than the thevenin resistance of the source to which it is connected ?

- 25.06 %
- 33.06 %
- 35.06 %
- 40.06 %

18) Mesh current analysis is based on

- Kirchhoff’s current law
- Kirchhoff’s voltage law
- Maxwell’s law
- None of the above

19) Nodal analysis is based on

- Kirchhoff’s current law
- Kirchhoff’s voltage law
- Maxwell’s law
- None of the above

20) The current through a branch in a linear circuit is 2 A when the input source voltage is 10 V. If the reduced to 1 V and the polarity is reversed, the current through the branch is

- -0.2 A
- 0.2 A
- 2 A
- -2 A

21) The superposition theorem applies to

- Current / Voltage calculations
- Power calculations
- Current and power calculations
- Voltage and power calculations

22) A load is connected to a circuit. At the terminals to which the load is connected, R_{TH} = 10 Ω and V_{TH} = 40 V. The maximum power supplied to the load is

- 160 W
- 80 W
- 40 W
- 1 W

23) When a network is loaded by a resistance equal in value to its Norton resistance, the Norton current is I_{N} . The current through the load will be

- I
_{N }/ 4 - 2I
_{N} - I
_{N }/ 2 - None of the above

24) A 120 V source has a series internal resistance of 1 Ω. The maximum power that can be delivered to a load is

- 900 W
- 1800 W
- 2700 W
- 3600 W

25) A 5 A source has a shunt internal resistance of 100 Ω. The maximum power that can be delivered to a load is

- 1250 W
- 625 W
- 325 W
- None of the above

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