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MCQOPTIONS
This section includes 236 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
A closed path made by several branches of the network is known as____________? |
| A. | branch |
| B. | loop |
| C. | circuit |
| D. | junction |
| Answer» C. circuit | |
| 2. |
A capacitor is generally a____________? |
| A. | bilateral and active component |
| B. | active, passive, linear and nonlinear component |
| C. | linear and bilateral component |
| D. | non-linear and active component |
| Answer» D. non-linear and active component | |
| 3. |
For the circuit given below, the Thevenin’s resistance across terminals A and B is |
| A. | 2 kΩ |
| B. | 0.2 kΩ |
| C. | 5 kΩ |
| D. | 0.5 kΩ |
| Answer» C. 5 kΩ | |
| 4. |
For the circuit shown below, the value of RL and maximum power are: |
| A. | 6 Ω and 0.51 W |
| B. | 12 Ω and 0.6 W |
| C. | 12 Ω and 0.75 W |
| D. | cannot be calculated without knowing RL |
| Answer» D. cannot be calculated without knowing RL | |
| 5. |
Find I in the network shown. |
| A. | 1 A |
| B. | 10 A |
| C. | 17 A |
| D. | 25 A |
| Answer» C. 17 A | |
| 6. |
In the circuit, Thevenin’s voltage and resistance across the terminals XY will be |
| A. | 20 V and 100 Ω |
| B. | 40 V and 93.33 Ω |
| C. | 60 V and 93.33 Ω |
| D. | 100 V and 100 Ω |
| Answer» E. | |
| 7. |
Millman’s theorem yields equivalent |
| A. | Impedance or resistance |
| B. | Current source |
| C. | Voltage source |
| D. | Voltage or current source |
| Answer» E. | |
| 8. |
An ideal transformer is rated 220/110 V. A source of 10 V and internal impedance of 2 Ω is connected to the primary. The power transferred to a load ZL connected across the secondary would be a maximum, when |ZL| is |
| A. | 4 Ω |
| B. | 2 Ω |
| C. | 1 Ω |
| D. | 0.5 Ω |
| Answer» E. | |
| 9. |
According to maximum power transfer theorem, maximum power transfer occurs when |
| A. | Load R is equal to the half the R of network |
| B. | Load R is equal to twice the R of network |
| C. | Load R is equal to the R of network looking back at it form voltage terminal |
| D. | Load R is equal to the R of network looking back at it from load terminal with all sources being replaced by their respective internal resistance. |
| Answer» E. | |
| 10. |
KVL gives the law of conservation of |
| A. | energy |
| B. | charge |
| C. | current |
| D. | voltage |
| Answer» B. charge | |
| 11. |
Find V3 and its polarity if the current I = 0.4 A in the given circuit. |
| A. | V3 = 30 V, terminal b is positive with respect to terminal a |
| B. | V3 = 30 V, terminal b is negative with respect to terminal a |
| C. | V3 = 20 V, terminal b is negative with respect to terminal a |
| D. | V3 = 20 V, terminal b is positive with respect to terminal a |
| Answer» B. V3 = 30 V, terminal b is negative with respect to terminal a | |
| 12. |
If I1 in the given circuit is 6 A, what will be the current I2 in the following circuit? |
| A. | 6 A |
| B. | 3 A |
| C. | -3 A |
| D. | < 3 A |
| Answer» B. 3 A | |
| 13. |
Find the KVL equation for the following circuit. |
| A. | Va – Vb = I (R1 + R2 – R3) |
| B. | Va+ Vb = i(R1 + R2 + R3) |
| C. | Va – Vb = i(R1 + R2 + R3) |
| D. | Va + V b = i(R1 + R2 – R3) |
| Answer» D. Va + V b = i(R1 + R2 – R3) | |
| 14. |
Calculate the equivalent resistance in the above circuit |
| A. | 6 Ω |
| B. | 9 Ω |
| C. | 7.7 Ω |
| D. | 12 Ω |
| Answer» B. 9 Ω | |
| 15. |
Consider the two-port resistive network shown in the figure. When an excitation of 5 V is applied across Port 1, and Port 2 is shorted, the current through the short circuit at Port 2 is measured to be 1 A (see (a) in the figure).Now, if an excitation of 5 V is applied across Port 2, and Port 1 is shorted (see (b) in the figure), what is the current through the short circuit at Port 1? |
| A. | 0.5 A |
| B. | 1 A |
| C. | 2 A |
| D. | 2.5 A |
| Answer» C. 2 A | |
| 16. |
Consider the following statements:(a) Tellegen’s theorem is applicable to any lumped networks(b) The reciprocity theorem is applicable to linear bilateral networks(c) Thevenin’s theorem is applicable to two - terminal linear active networks(d) Norton’s theorem is applicable to two - terminal linear active networksWhich of the above statements are correct? |
| A. | (a), (b) and (c) only |
| B. | (a), (b) and (d) only |
| C. | (a), (b), (c) and (d) |
| D. | (b), (c) and (d) only |
| Answer» D. (b), (c) and (d) only | |
| 17. |
As shown in the given figure, three lightbulbs are connected to a 9V battery. Calculate:(a) The total current supplied by the battery(b) The current through each bulb and(c) The resistance of each bulb |
| A. | (a) 5 A(b) 2.22 A2.77 A(c) 4.05 Ω1.945 Ω1.297 Ω |
| B. | (a) 5 A(b) 1.22 A2.77 A(c) 5.05 Ω1. 45 Ω1.97 Ω |
| C. | (a) 3 A(b) 3.22 A1.77 A(c) 2.05 Ω1.945 Ω2.297 Ω |
| D. | (a) 4 A(b) 3.22 A3.77 A(c) 4.5 Ω3.945 Ω6.29 Ω |
| Answer» B. (a) 5 A(b) 1.22 A2.77 A(c) 5.05 Ω1. 45 Ω1.97 Ω | |
| 18. |
According to Tellegen’s theorem, which one of the following is correct? |
| A. | ∑ power delivered = ∑ power absorbed |
| B. | ∑ power delivered = K / ∑ power absorbed |
| C. | ∑ power delivered = 1 / ∑ power absorbed |
| D. | ∑ power delivered = 2 × ∑ power absorbed |
| Answer» B. ∑ power delivered = K / ∑ power absorbed | |
| 19. |
Ohm’s law is applicable to: |
| A. | Constant and Variable Temperatures |
| B. | Constant Temperature |
| C. | Variable temperature |
| D. | Any of the options |
| Answer» C. Variable temperature | |
| 20. |
In the analysis of a vacuum tube circuit, we generally use __________ Theorem |
| A. | superposition |
| B. | Norton's |
| C. | Thevenin's |
| D. | Reciprocity |
| Answer» D. Reciprocity | |
| 21. |
For maximum power transfer between two cascaded sections of an electrical network, the relationship between the output impedance Z1 of the first section to the input impedance Z2 of the second section is |
| A. | Z2 = Z1 |
| B. | Z2 = -Z1 |
| C. | \({Z_2} = Z_1^*\) |
| D. | \({Z_2} = - Z_1^*\) |
| Answer» D. \({Z_2} = - Z_1^*\) | |
| 22. |
Find the value of Norton resistance at the terminals a-b for the circuit shown here.(where V = 10 V, I = 5 A, R1 = 9 Ω, R2 = 18 Ω, R3 = 4 Ω) |
| A. | 50 Ω |
| B. | 25 Ω |
| C. | 10 Ω |
| D. | 20 Ω |
| Answer» D. 20 Ω | |
| 23. |
It is required to find the current through a particular branch of a linear bilateral network without mutual coupling when the branch impedance takes four different values, Which one of the following methods will be preferred? |
| A. | Mesh analysis |
| B. | Thevenin's equivalent circuit |
| C. | Nodal analysis |
| D. | Superposition theorem |
| Answer» C. Nodal analysis | |
| 24. |
Application of Norton’s theorem in a circuit results in |
| A. | a current source and an impedance in parallel |
| B. | a voltage source and an impedance in series |
| C. | an ideal voltage source |
| D. | an ideal current source |
| Answer» B. a voltage source and an impedance in series | |
| 25. |
A voltage source of 240 volts having an internal impedance of (3 — j4) Ω is supplying power to a complex load impedance Z1. What will be the maximum power transferred to the load ? |
| A. | 2.4 kW |
| B. | 3.6 kW |
| C. | 4.8 kW |
| D. | 6.0 kW |
| Answer» D. 6.0 kW | |
| 26. |
A source \({V_s}\left( t \right) = Vcos100\pi t\) has an internal impedance of (4 + 3j) Ω, if a purely resistive load is connected at load to extract Pmax , then its value is (in ohms) |
| A. | 3 |
| B. | 4 |
| C. | 5 |
| D. | 7 |
| Answer» D. 7 | |
| 27. |
Determine Thevenin's voltage (Vth ) as seen from AB in the network shown. |
| A. | 33.6 V |
| B. | 63.3 V |
| C. | 3.36 V |
| D. | 6.33 V |
| Answer» D. 6.33 V | |
| 28. |
For the network shown in the given figure, find Thevenin’s equivalent resistance as seen through the terminals ‘A’ and ‘B’. |
| A. | \(\frac{{40}}{3}\;ohm\) |
| B. | \(\frac{{30}}{3}\;ohm\) |
| C. | \(\frac{{20}}{3}\;ohm\) |
| D. | \(\frac{{10}}{3}\;ohm\) |
| Answer» B. \(\frac{{30}}{3}\;ohm\) | |
| 29. |
In a balanced Wheatstone bridge, if the position of detector and source are interchanged, the bridge will still remain balanced. This inference can be drawn from |
| A. | Reciprocity theorem |
| B. | Duality theorem |
| C. | Compensation theorem |
| D. | Equivalence theorem |
| Answer» B. Duality theorem | |
| 30. |
Assertion (A): Superposition theorem can be used to find the output of a full-wave rectifier excited by sinusoidal signal sources of different frequencies connected in series.Reason (R): Superposition theorem is valid for all linear systems. |
| A. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| B. | Both (A) and (R) are true, but (R) is not the correct explanation of (A). |
| C. | (A) is true, but (R) is false |
| D. | (A) is false, but (R) is true |
| Answer» E. | |
| 31. |
For the circuit find the equivalent Thevenin's voltage and resistance |
| A. | 100 V, 75 Ω |
| B. | 100 V, 55 Ω |
| C. | 155 V, 75 Ω |
| D. | 155 V, 55 Ω |
| Answer» E. | |
| 32. |
For the network shown, the equivalent Thevenin voltage and Thevenin impedance as seen across terminals 'ab' is |
| A. | 35 V in series with 2 Ω |
| B. | 10 V in series with 12 Ω |
| C. | 65 V in series with 15 Ω |
| D. | 50 V in series with 2 Ω |
| Answer» D. 50 V in series with 2 Ω | |
| 33. |
Compensation theorem applicable to antennas is also called as |
| A. | Millman’s theorem |
| B. | superposition theorem |
| C. | substitution theorem |
| D. | power transfer theorem |
| Answer» D. power transfer theorem | |
| 34. |
Assume that the source in the circuit shown here is delivering maximum power to the load resistor. What is the total power loss in the load? |
| A. | 5 W |
| B. | 2.5 W |
| C. | 20 W |
| D. | 10 W |
| Answer» C. 20 W | |
| 35. |
Match List I with List-II and select the correct answer using the code given below the lists: List I List IIA. Superposition theorem1. Impedance matching in audio circuitsB. Thevenin's theorem2. Linear bilateral networksC. Kirchhoff's voltage and current laws3. Large network in which currents in few elements to be determinedD. Maximum power transfer theorem4. Currents and voltage in all branches of a network |
| A. | A - 1, B - 4, C - 3, D - 2 |
| B. | A - 2, B - 4, C - 3, D - 1 |
| C. | A - 1, B - 3, C - 4, D - 2 |
| D. | A - 2, B - 3, C - 4, D - 1 |
| Answer» E. | |
| 36. |
A certain network consists of two ideal voltage sources and a large number of ideal resistors. The power consumed in one of the resistors is 4 W when either of the two sources is active and the other is replaced by a short circuit. The power consumed by the same resistor, when both the sources are simultaneously active, would be: |
| A. | Zero or 16 W |
| B. | 4 W or 8 W |
| C. | Zero or 8 W |
| D. | 8 W or 16 W |
| Answer» B. 4 W or 8 W | |
| 37. |
If a constant current generator of 5 A, shunted by its own resistance of 1 Ω, delivers maximum power P in watts to its load of RL Ω, then the voltage across the current generator and P are |
| A. | 5 V and 6.25 |
| B. | 2.5 V and 12.5 |
| C. | 5 V and 12.5 |
| D. | 2.5 V and 6.25 |
| Answer» E. | |
| 38. |
A source of angular frequency 1 rad/sec has a source impedance consisting of 1 Ω resistance in series with 1 H inductance. The load that will obtain the maximum power transfer is |
| A. | 1 Ω resistance |
| B. | 1 Ω resistance in parallel with 1 H inductance |
| C. | 1 Ω resistance in series with 1 F capacitor |
| D. | 1 Ω resistance in parallel with 1 F capacitor |
| Answer» D. 1 Ω resistance in parallel with 1 F capacitor | |
| 39. |
Obtain the Thevenin equivalent circuit parameters Vth and Rth for the following network. |
| A. | Vth = 10 V, Rth = 5 Ω |
| B. | Vth = 5 V, Rth = 5 Ω |
| C. | Vth = 10 V, Rth = 6 Ω |
| D. | Vth = 6 V, Rth = 5 Ω |
| Answer» B. Vth = 5 V, Rth = 5 Ω | |
| 40. |
Determine the value of source impedance (in Ohms) for transmitting maximum power to the load in the circuit given below. |
| A. | 7 + j3 |
| B. | 7 – j3 |
| C. | 3 + j7 |
| D. | 3 – j7 |
| Answer» C. 3 + j7 | |
| 41. |
“Any two terminal linear bilateral dc network can be replaced by an equivalent circuit consisting of a current source and a parallel resistor” is the statement of |
| A. | Norton’s theorem |
| B. | Thevenin’s theorem |
| C. | Millman’s theorem |
| D. | Superposition theorem |
| Answer» B. Thevenin’s theorem | |
| 42. |
Find the Thevenin equivalent VTH and RTH between the terminals A & B of the circuit |
| A. | 4.16 V, 120 Ω |
| B. | 41.6 V, 120 Ω |
| C. | 4.16 V, 70 Ω |
| D. | 41.6 V, 70Ω |
| Answer» E. | |
| 43. |
According to Millman’s Theorem, if there are n voltage sources with n internal resistances, connected in parallel, then these sources are replaced by? |
| A. | single current source I’ in series with R’ |
| B. | single voltage source V’ in series with R’ |
| C. | single current source I’ in parallel to R’ |
| D. | single voltage source V’ in parallel to R’ |
| Answer» C. single current source I’ in parallel to R’ | |
| 44. |
In the given circuit, the value of load resistance for which the power delivered is maximum is: |
| A. | 2 Ω |
| B. | 9 Ω |
| C. | 4.5 Ω |
| D. | 6 Ω |
| Answer» D. 6 Ω | |
| 45. |
In the RL circuit given below, the maximum power will be transferred when value of RL is |
| A. | 5 Ohms |
| B. | 15 Ohms |
| C. | 20 Ohms |
| D. | 25 Ohms |
| Answer» C. 20 Ohms | |
| 46. |
In the figure below, impedance value of load ZL which will cause maximum power to be transferred to the load, is |
| A. | (2 + j2)Ω |
| B. | (- j2)Ω |
| C. | 2 Ω |
| D. | (-2 + j2)Ω |
| Answer» D. (-2 + j2)Ω | |
| 47. |
A load resistor RL is connected to a battery of voltage E with internal resistance Ri through a resistance RS as shown in the figure. For fixed values of RL and Ri, the value of RS (≥ 0) for maximum power transfer to RL is |
| A. | 0 |
| B. | RL - Ri |
| C. | RL |
| D. | RL + Ri |
| Answer» B. RL - Ri | |
| 48. |
Find v0 in the following circuit using the superposition theorem. |
| A. | 10 V |
| B. | 12 V |
| C. | 7.4 V |
| D. | 4.6 V |
| Answer» D. 4.6 V | |
| 49. |
According to Tellegen's Theorem, the sum of instantaneous powers for the n branches in a network is always: |
| A. | Constant |
| B. | Equal to zero |
| C. | In-phase with current |
| D. | Alternating |
| Answer» C. In-phase with current | |
| 50. |
In the circuit shown below, the current through 10Ω resistor is: |
| A. | 5 A |
| B. | 10 A |
| C. | -5 A |
| D. | None of these |
| Answer» E. | |