MCQOPTIONS
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MCQOPTIONS
This section includes 439 Mcqs, each offering curated multiple-choice questions to sharpen your Network Theory knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
How is the voltage determined when the current and resistance are given? |
| A. | Divide the current by the resistance |
| B. | Subtract the current from the resistance |
| C. | Multiply the current and resistance |
| D. | Add the current and the resistance |
| Answer» D. Add the current and the resistance | |
| 2. |
Calculate the current I in the following circuit: |
| A. | 5 A |
| B. | 12 A |
| C. | 15 A |
| D. | 3 A |
| Answer» E. | |
| 3. |
A passive network has |
| A. | no current source |
| B. | no emf source |
| C. | only emf source |
| D. | neither current source nor emf source |
| Answer» E. | |
| 4. |
For a transmission line, three delta connected capacities each having 10 μF capacitance, if converted to equivalent star connection, how much would each capacitance be? |
| A. | 15 μF |
| B. | 30 μF |
| C. | 3.3 μF |
| D. | 45 μF |
| Answer» C. 3.3 μF | |
| 5. |
A 1 Ω resistor is connected across a source having load line v + i = 100. Determine the current through the resistor. |
| A. | 80 A |
| B. | 50 A |
| C. | 20 A |
| D. | 100 A |
| Answer» C. 20 A | |
| 6. |
For the circuit shown what is the voltage V if the source voltage is reduced by 50% and the voltage across the current source remain constant? |
| A. | IR + E |
| B. | E – IR |
| C. | 2IR – (E/2) |
| D. | - ((E/2) + IR ) |
| Answer» E. | |
| 7. |
Based on the voltmeter and ammeter readings in the measuring network, determine the value of the resistor R. |
| A. | 1 ohm |
| B. | 10 ohm |
| C. | 5 ohm |
| D. | 2 ohm |
| Answer» C. 5 ohm | |
| 8. |
A conducting wire of length l and resistance R is cut into four equal parts. The four parts are then connected in parallel. The resistance of the combination is |
| A. | R/4 |
| B. | R/8 |
| C. | R/16 |
| D. | 4 R |
| Answer» D. 4 R | |
| 9. |
Power Loss in a resistor is given by: |
| A. | P = V2R |
| B. | \(P = \frac{V}{I}\) |
| C. | \(P = \frac{{{I^2}}}{R}\) |
| D. | \(P = \frac{{{V^2}}}{R}\) |
| Answer» E. | |
| 10. |
Let Δq be the net charge passing through an element in a period of Δt. What is the current passing through that element? |
| A. | Δq × Δt |
| B. | \(\frac{{{\rm{\Delta }}q}}{{{\rm{\Delta }}t}}\) |
| C. | Δt/Δq |
| D. | q |
| Answer» C. Δt/Δq | |
| 11. |
A single phase one pulse controlled circuit has a resistance and counter emf load 200sin (512t)as the source voltage for a load counter emf of 100 V. the range of firing angle control will be: |
| A. | 120° to 150° |
| B. | 30° to 110° |
| C. | 0° to 30° |
| D. | 30° to 150° |
| Answer» E. | |
| 12. |
Consider the following given circuit and find the value of total current drawn from the cell and the potential difference across the 3 Ω resistor respectively. |
| A. | 0.4 A, 0.8 V |
| B. | 0.84 A, 0.6 V |
| C. | 0.56 A, 0.8 V |
| D. | 0.9 A, 0.8 V |
| Answer» B. 0.84 A, 0.6 V | |
| 13. |
As the temperature of pure metal increases, the product of its resistivity and its conductivity: |
| A. | increases linearly |
| B. | increases exponentially |
| C. | decreases |
| D. | remains constant |
| Answer» E. | |
| 14. |
A resistor is connected to a voltage source. What will happen to the power dissipated in the resistor if the voltage is doubled? |
| A. | Becomes two times |
| B. | Becomes four times |
| C. | Becomes one half |
| D. | Becomes one fourth |
| Answer» C. Becomes one half | |
| 15. |
______ are those which offer very high resistance to the flow of electric current through them when subjected to electric. |
| A. | Conducting materials |
| B. | Insulating materials |
| C. | Ferromagnetic materials |
| D. | Semiconducting materials |
| Answer» C. Ferromagnetic materials | |
| 16. |
A 60 W bulb in series with a room heater is connected across the mains. What will happen if the 60 W bulb is replaced by a 100 W bulb? |
| A. | The heater output will increase |
| B. | The heater output will slightly decrease |
| C. | The heater output will be the same |
| D. | The heater output will decrease |
| Answer» B. The heater output will slightly decrease | |
| 17. |
If the charge on each of the capacitors in the given figure is 4500 μC, what is the total capacitance in μF? |
| A. | 325 |
| B. | 11.1 |
| C. | 22.2 |
| D. | 33.3 |
| Answer» E. | |
| 18. |
A 4.0 ohm resistor has current I = 2.5 sin ωt A. Find the power dissipated in the resistor. |
| A. | 25 sin2 ω2t (W) |
| B. | 2.5 sin2ωt (W) |
| C. | 25 sin2ωt (W) |
| D. | 2.5 sin ωt (W) |
| Answer» D. 2.5 sin ωt (W) | |
| 19. |
In fuel cell, ______ energy is converted into electrical energy. |
| A. | Mechanical |
| B. | Heat |
| C. | Sound |
| D. | Chemical |
| Answer» E. | |
| 20. |
A capacitor is basically constructed of |
| A. | Conductor and Semiconductor |
| B. | Conductor and Dielectric |
| C. | Two conductors separated by a dielectric |
| D. | Two dielectric separated by a conductor |
| Answer» D. Two dielectric separated by a conductor | |
| 21. |
Heat generated across a resistance is |
| A. | Directly proportional to current flowing through it |
| B. | Inversely proportional to the value of resistance |
| C. | Directly proportional to the square of current flowing through it |
| D. | Directly proportional to square of resistance |
| Answer» D. Directly proportional to square of resistance | |
| 22. |
By inserting a plate of dielectric between the plates of a parallel plate capacitor, the energy stored is increased 5 times. The dielectric constant is |
| A. | 0.04 |
| B. | 0.2 |
| C. | 5 |
| D. | 25 |
| Answer» D. 25 | |
| 23. |
Coulomb's law for the force between electric charges closely resembles with __________. |
| A. | Newton's law of motion |
| B. | Law of conservation of energy |
| C. | Gauss's theory |
| D. | Newton's law of gravitation |
| Answer» E. | |
| 24. |
If a current of 10 A flows for 4 minutes, find the quantity of electricity transferred |
| A. | 2.5 C |
| B. | 40 C |
| C. | 0.4 C |
| D. | 2400 C |
| Answer» E. | |
| 25. |
One coulomb of electrical charge is contributed by how many electrons? |
| A. | 0.625 × 1019 |
| B. | 1.6 × 10-19 |
| C. | 1019 |
| D. | None of these |
| Answer» B. 1.6 × 10-19 | |
| 26. |
A factory runs in 4 shifts of 6 hours each, in which it consumes 36 kW, 86 KW, 50 kW and 20 kW in each shift respectively. Calculate the energy (in kWh) consumed by the factory per day. |
| A. | 216 |
| B. | 557 |
| C. | 1152 |
| D. | 1920 |
| Answer» D. 1920 | |
| 27. |
Insertion loss for SC type fiber connector in dB is of the range: |
| A. | 1.5-2.0 |
| B. | 1.0-1.5 |
| C. | 0.3-1.0 |
| D. | 0.2-0.45 |
| Answer» E. | |
| 28. |
Flow of electrons in circuit constitutes |
| A. | Magnetic charge |
| B. | An e.m.f |
| C. | An electric current |
| D. | An electric charge |
| Answer» D. An electric charge | |
| 29. |
For the replacement of internal resistors, the ideal voltage source is replaced by: |
| A. | capacitor |
| B. | short circuit |
| C. | current source |
| D. | open circuit |
| Answer» C. current source | |
| 30. |
If m identical cells of e.m.f. V and internal resistance 'r' are connected in series, they produce a current through an external resistance R equal to |
| A. | \(\frac{{{\rm{mV}}}}{{{\rm{r}} + {\rm{R}}}}\) |
| B. | \(\frac{{{\rm{mV}}}}{{\rm{R}}}\) |
| C. | \(\frac{{\rm{V}}}{{{\rm{r}} + {\rm{R}}}}\) |
| D. | \(\frac{{{\rm{mV}}}}{{{\rm{mr}} + {\rm{R}}}}\) |
| Answer» E. | |
| 31. |
N resistors each of resistance R when connected in series offer an equivalent resistance of 50 Ω and when reconnected in parallel the effective resistance is 2 Ω. The value of R is |
| A. | 2.5 Ω |
| B. | 5 Ω |
| C. | 7.5 Ω |
| D. | 10 Ω |
| Answer» E. | |
| 32. |
An electrical circuit with 10 branches and 7 junctions will have |
| A. | 10 loop equations |
| B. | 4 loop equations |
| C. | 3 loop equations |
| D. | 7 loop equations |
| Answer» C. 3 loop equations | |
| 33. |
Determine the value of equivalent inductance, if 4 inductors having inductance L are connected in parallel |
| A. | 4L |
| B. | L/4 |
| C. | 4/L |
| D. | 8L |
| Answer» C. 4/L | |
| 34. |
Determine the power (in W) of lamp A and lamp B respectively for the given circuit diagram. |
| A. | 75.56, 33.64 |
| B. | 76.65, 38.86 |
| C. | 71.11, 35.37 |
| D. | 68.62, 38.86 |
| Answer» D. 68.62, 38.86 | |
| 35. |
If two 0.25 micro farad capacitors are connected in series, what will be the total effective capacitance? |
| A. | 0.125 micro farad |
| B. | 0.0624 micro farad |
| C. | 2.5 micro farad |
| D. | 0.50 micro farad |
| Answer» B. 0.0624 micro farad | |
| 36. |
If the temperature increases, the resistance of pure metal: |
| A. | first increases then decreases |
| B. | remains constant |
| C. | increases |
| D. | decreases |
| Answer» D. decreases | |
| 37. |
Find the voltage across 30 Ω resistor in the given circuit. |
| A. | 105 V |
| B. | 45 V |
| C. | 75 V |
| D. | 30 V |
| Answer» C. 75 V | |
| 38. |
If the Δ impedances are Za, Zb and Zc and the Y impedances are Z1, Z2 and Z3, then which one of the following relations is correct? |
| A. | Z1 = ZaZbZc |
| B. | \({Z_1} = \frac{1}{{{Z_a} + {Z_b} + {Z_c}}}\) |
| C. | Z1 = Za + Zb + Zc |
| D. | \({Z_1} = \frac{{{Z_b}{Z_c}}}{{{Z_a} + {Z_b}+{Z_c}}}\) |
| Answer» E. | |
| 39. |
If the area, length, and the number of turns of an AC circuit are doubled, then the new inductance will be: |
| A. | Twice the former |
| B. | Four times the former |
| C. | Same |
| D. | Half the former |
| Answer» C. Same | |
| 40. |
If the three resistors in a delta network are all equal in values i.e. RDELTA, then the value of the resultant resistors in each branch of the equivalent star network i.e. RSTAR will be equal to: |
| A. | \(\frac{R_{DELTA}}{3}\) |
| B. | \(\frac{R_{DELTA}}{2}\) |
| C. | 2 RDELTA |
| D. | RDELTA |
| Answer» B. \(\frac{R_{DELTA}}{2}\) | |
| 41. |
In the circuit shown below power delivered by the source is: |
| A. | 12 W |
| B. | 6 W |
| C. | 3 W |
| D. | 9 W |
| Answer» D. 9 W | |
| 42. |
In a four branch parallel circuit, 50 mA current flows in each branch. If one of the branches opens, the current in other branches |
| A. | Increase, but not double |
| B. | Decrease |
| C. | Unaffected |
| D. | Double |
| Answer» D. Double | |
| 43. |
Capacitance of a parallel plate capacitor is not affected by |
| A. | area of plates |
| B. | thickness of plates |
| C. | separation between plates |
| D. | nature of dielectric |
| Answer» C. separation between plates | |
| 44. |
Conductance is defined as reciprocal of: |
| A. | Resistance |
| B. | Capacitance |
| C. | Susceptance |
| D. | Inductance |
| Answer» B. Capacitance | |
| 45. |
Parallel combination of a 10Ω resistor and a 5Ω resistor are connected to a DC voltage source. The total current drawn from the voltage source is 15A. What is the current through the 5Ω resistor? |
| A. | 10 A |
| B. | 5 A |
| C. | 1 A |
| D. | None of the above |
| Answer» B. 5 A | |
| 46. |
Determine the total resistance of the circuit given below. |
| A. | 24.12 |
| B. | 23.36 |
| C. | 26.66 |
| D. | 28.86 |
| Answer» D. 28.86 | |
| 47. |
Find the power delivered by the sources in the following circuit. |
| A. | Pa = -200 W, Pb = 500 W |
| B. | Pa = -200 W, Pb = -500 W |
| C. | Pa = -100 W, Pb= 300 W |
| D. | Pa = 500 W, Pb= 200 W |
| Answer» B. Pa = -200 W, Pb = -500 W | |
| 48. |
In the circuit shown below, if I1 = 1.5 A, then I2 will be |
| A. | 0.5 A |
| B. | 0 A |
| C. | 1.5 A |
| D. | 3.0 A |
| Answer» D. 3.0 A | |
| 49. |
A current of 2.2 A flows through a coil when connected 220 V DC. When 220 V 50 Hz AC is applied to the same coil, current is 1 A. What is inductance of coil? |
| A. | 6.24 H |
| B. | 62.4 mH |
| C. | 0.624 H |
| D. | 0.624 mH |
| Answer» D. 0.624 mH | |
| 50. |
Analyze the following diagram and find the electric current in the 5 Ω resistor. |
| A. | 1.438 A |
| B. | 0.711 A |
| C. | 1.325 A |
| D. | 0.824 A |
| Answer» C. 1.325 A | |