MCQOPTIONS
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MCQOPTIONS
This section includes 15 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. |
12, 1 H inductors are used as edge to form a cube. The inductance between two diagonally opposite corners of the cube is ____________ |
| A. | \(\frac{5}{6}\) H |
| B. | \(\frac{10}{6}\) H |
| C. | 2 H |
| D. | \(\frac{3}{2}\) H |
| Answer» B. \(\frac{10}{6}\) H | |
| 2. |
The discharge of a capacitor through a ballistic galvanometer produces a damped frequency of 0.125 Hz and successive swings of 120, 96 and 76.8 mm. The logarithmic decrement is? |
| A. | 0.225 |
| B. | 0.565 |
| C. | 0.484 |
| D. | 0.7887 |
| Answer» B. 0.565 | |
| 3. |
A rectifier type AC voltmeter consists of a series resistance R, an ideal full-wave rectifier bridge and a PMMC instrument. A DC current of 1 mA produces a full-scale deflection of the instrument. The resistance of the instrument is 100 Ω. A voltage of 100 V (rms) is applied to the input terminals. The value of R required is? |
| A. | 63.56 Ω |
| B. | 89.83 Ω |
| C. | 89.83 kΩ |
| D. | 141.3 kΩ |
| Answer» D. 141.3 kΩ | |
| 4. |
A current I given by I = – 8 + 6\(\sqrt{2}\) (sin (ωt + 30°)) A is passed through three meters. The respective readings (in ampere) will be? |
| A. | 8, 6 and 10 |
| B. | 8, 6 and 8 |
| C. | – 8, 10 and 10 |
| D. | -8, 2 and 2 |
| E. | will be?a) 8, 6 and 10b) 8, 6 and 8c) – 8, 10 and 10d) -8, 2 and 2 |
| Answer» D. -8, 2 and 2 | |
| 5. |
A 10 V is connected across a load whose V-I characteristics is given by 7I = V2 + 2V. The internal resistance of the battery is of magnitude 1Ω. The current delivered by the battery is ____________ |
| A. | 6 A |
| B. | 5 A |
| C. | 7 A |
| D. | 8 A |
| Answer» C. 7 A | |
| 6. |
In the circuit given below, the value of ZL for maximum power to be transferred is _____________ |
| A. | R |
| B. | R + jωL |
| C. | R – jωL |
| D. | jωL |
| Answer» D. jωL | |
| 7. |
A relay coil having voltage of magnitude 210 V and frequency 50 Hz is connected to a 210 V, 50 Hz supply. If it has resistance of 50 Ω and an inductance of 0.2 H, the apparent power is _____________ |
| A. | 549.39 VA |
| B. | 275.6 VA |
| C. | 157 VA |
| D. | 187 VA |
| Answer» B. 275.6 VA | |
| 8. |
An inductive coil connected to a 200 V, 50 Hz AC supply with 10 A current flowing through it dissipates 1000 W. The value of the impedance Z and Reactance XL are respectively ____________ |
| A. | 10 Ω and 15 Ω |
| B. | 20 Ω and 17.3 Ω |
| C. | 17.3 Ω and 20 Ω |
| D. | 15 Ω and 10 Ω |
| Answer» C. 17.3 Ω and 20 Ω | |
| 9. |
An inductive coil connected to a 200 V, 50 Hz AC supply with 10 A current flowing through it dissipates 1000 W. Which of the following will have least value? |
| A. | Resistance R |
| B. | Reactance XL |
| C. | Impedance Z |
| D. | Reactance XC |
| Answer» B. Reactance XL | |
| 10. |
A voltage having the waveform of a sine curve is applied across a capacitor. When the frequency of the voltage is increased, what happens to the current through the capacitor? |
| A. | Increases |
| B. | Decreases |
| C. | Remains same |
| D. | Is zero |
| Answer» B. Decreases | |
| 11. |
A periodic rectangular signal X (t) has the waveform as shown below. The frequency of the fifth harmonic of its spectrum is ______________ |
| A. | 40 Hz |
| B. | 200 Hz |
| C. | 250 Hz |
| D. | 1250 Hz |
| Answer» E. | |
| 12. |
In the circuit given below, the current source is 1∠0° A, R = 1 Ω, the impedances are ZC = -j Ω and ZL = 2j Ω. The Thevenin equivalent looking across A-B is __________ |
| A. | \(\sqrt{2}\)∠0 V, (1+2j) Ω |
| B. | 2∠45° V, (1-2j) Ω |
| C. | 2∠45° V, (1+j) Ω |
| D. | \(\sqrt{2}\)∠45° V, (1+j) Ω |
| Answer» E. | |
| 13. |
In the circuit given below, the value of Z which would cause parallel resonance at 500 Hz is ___________ |
| A. | 125 mH |
| B. | 34.20 μF |
| C. | 2 μF |
| D. | 0.05 μF |
| Answer» E. | |
| 14. |
In the circuit given below, Z1 = 10∠-60°, Z2 = 10∠60°, Z3 = 50∠53.13°. The Thevenin impedance as seen from A-B is _____________ |
| A. | 56.5∠45° |
| B. | 60∠30° |
| C. | 70∠30° |
| D. | 34.4∠65° |
| Answer» B. 60∠30° | |
| 15. |
A voltage waveform V (t) = 12t2 is applied across a 1 H inductor for t≥0, with initial current through it being 0. The current through the inductor for t greater than 0 is ___________ |
| A. | 12t |
| B. | 24t |
| C. | 12t3 |
| D. | 4t3 |
| Answer» E. | |