MCQOPTIONS
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MCQOPTIONS
This section includes 12 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. |
A 50 Hz, bar primary CT has a secondary with 800 turns. The secondary supplies 7 A current into a purely resistive burden of 2 Ω. The magnetizing ampere-turns are 300. The phase angle is? |
| A. | 3.1° |
| B. | 85.4° |
| C. | 94.6° |
| D. | 175.4° |
| Answer» B. 85.4° | |
| 2. |
A coil (which can be modelled as a series RL circuit) has been designed for a high Quality Factor (Q) performance. The voltage is rated at and a specified frequency. If the frequency of operation is increased 10 times and the coil is operated at the same rated voltage. The new value of Q factor and the active power P will be? |
| A. | P is doubled and Q is halved |
| B. | P is halved and Q is doubled |
| C. | P remains constant and Q is doubled |
| D. | P decreases 100 times and Q is increased 10 times |
| Answer» E. | |
| 3. |
A 50 μF capacitor, when connected in series with a coil having a resistance of 40Ω, resonates at 1000 Hz. The inductance of the coil for the resonant circuit is ____________ |
| A. | 2.5 mH |
| B. | 1.2 mH |
| C. | 0.5 mH |
| D. | 0.1 mH |
| Answer» D. 0.1 mH | |
| 4. |
In a series resonance type BPF, C = 1.8 pf, L = 25 mH, RF = 52 Ω and RL = 9 kΩ. The Bandwidth is ___________ |
| A. | 331 kHz |
| B. | 575 kHz |
| C. | 331 Hz |
| D. | 575 Hz |
| Answer» D. 575 Hz | |
| 5. |
In a series resonance type BPF, C = 1.8 pf, L = 25 mH, RF = 52 Ω and RL = 9 kΩ. The Resonant frequency f is __________ |
| A. | 75.1 kHz |
| B. | 751 kHz |
| C. | 575 kHz |
| D. | 57.5 kHz |
| Answer» C. 575 kHz | |
| 6. |
For the series circuit given below, the value of the cut-off frequencies are ____________ |
| A. | 78.235 kHz; 16.215 kHz |
| B. | 13.135 kHz; 81.531 kHz |
| C. | 16.716 kHz; 15.124 kHz |
| D. | 50.561 kHz; 18.686 kHz |
| Answer» D. 50.561 kHz; 18.686 kHz | |
| 7. |
For the series resonant circuit given below, the bandwidth is ____________ |
| A. | ±351 Hz |
| B. | ±796 Hz |
| C. | ±531 Hz |
| D. | ±225 Hz |
| Answer» C. ±531 Hz | |
| 8. |
For the series resonant circuit given below, the value of the quality factor is ___________ |
| A. | 15 |
| B. | 36 |
| C. | 25 |
| D. | 10 |
| Answer» E. | |
| 9. |
For the series resonant circuit shown below, the value of the resonant frequency is _________ |
| A. | 36.84 kHz |
| B. | 40.19 kHz |
| C. | 25.28 kHz |
| D. | 15.9 kHz |
| Answer» E. | |
| 10. |
For the resonant circuit given below, the value of the quality factor of the circuit is __________ |
| A. | 5.6 |
| B. | 7.1 |
| C. | 8.912 |
| D. | 12.6 |
| Answer» C. 8.912 | |
| 11. |
A 50 Hz voltage is measured with a moving iron voltmeter and a rectifier type AC voltmeter connected in parallel. If the meter readings are Va and Vb respectively. Then the form factor may be estimated as? |
| A. | \(\frac{V_a}{V_b} \) |
| B. | \(\frac{1.11V_a}{V_b}\) |
| C. | \(\frac{\sqrt{2} V_a}{V_b}\) |
| D. | \(\frac{πV_a}{V_b}\) |
| Answer» C. \(\frac{\sqrt{2} V_a}{V_b}\) | |
| 12. |
A circuit tuned to a frequency of 1.5 MHz and having an effective capacitance of 150 pF. In this circuit, the current falls to 70.7 % of its resonant value. The frequency deviates from the resonant frequency by 5 kHz. Effective resistance of the circuit is? |
| A. | 2 Ω |
| B. | 3 Ω |
| C. | 5.5 Ω |
| D. | 4.7 Ω |
| Answer» E. | |