MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 14 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 circuit excited by voltage V has a resistance R which is in series with an inductor and a capacitor connected in parallel. The voltage across the resistor at the resonant frequency is ___________ |
| A. | 0 |
| B. | ( frac{V}{2} ) |
| C. | ( frac{V}{3} ) |
| D. | V |
| Answer» B. ( frac{V}{2} ) | |
| 2. |
For a transmission line, open circuit and short circuit impedances are 10 and 20 . Then characteristic impedance is ____________ |
| A. | 100 |
| B. | 50 |
| C. | 25 |
| D. | 200 |
| Answer» E. | |
| 3. |
A capacitor stores 0.15C at 5 V. Its capacitance is ____________ |
| A. | 0.75 F |
| B. | 0.75 F |
| C. | 0.03 F |
| D. | 0.03 F |
| Answer» D. 0.03 F | |
| 4. |
A series RC circuit has R = 15 and C = 1 F. The current in the circuit is 5 sin 10t. The applied voltage is _____________ |
| A. | 218200 cos (10t 89.99 ) |
| B. | 218200 sin (10t 89.99 ) |
| C. | 218200 sin (10t) |
| D. | 218200 cos (10t) |
| Answer» C. 218200 sin (10t) | |
| 5. |
A 3 phase balanced supply feeds a 3-phase unbalanced load. Power supplied to the load can be measured by ___________ |
| A. | 2 Wattmeter and 1 Wattmeter |
| B. | 2 Wattmeter and 3 Wattmeter |
| C. | 2 Wattmeter and 2 Wattmeter |
| D. | Only 3 Wattmeter |
| Answer» C. 2 Wattmeter and 2 Wattmeter | |
| 6. |
The impedance of an RC series circuit is 12 at f = 50 Hz. At f = 200 Hz, the impedance will be? |
| A. | More than 12 |
| B. | Less than 3 |
| C. | More than 3 but less than 12 |
| D. | More than 12 but less than 24 |
| Answer» D. More than 12 but less than 24 | |
| 7. |
In an RC series circuit R = 100 and XC = 10 . Which of the following is possible? |
| A. | The current and voltage are in phase |
| B. | The current leads the voltage by about 6 |
| C. | The current leads the voltage by about 84 |
| D. | The current lags the voltage by about 6 |
| Answer» C. The current leads the voltage by about 84 | |
| 8. |
In an AC circuit, the maximum and minimum values of power factor can be ___________ |
| A. | 2 and 0 |
| B. | 1 and 0 |
| C. | 0 and -1 |
| D. | 1 and -1 |
| Answer» C. 0 and -1 | |
| 9. |
The current rating of a cable depends on ___________ |
| A. | Length of the cable |
| B. | Diameter of the cable |
| C. | Both length and diameter of the cable |
| D. | Neither length nor diameter of the cable |
| Answer» C. Both length and diameter of the cable | |
| 10. |
The electrical energy required to heat a bucket of water to a certain temperature is 10 kWh. If heat losses, are 10%, the energy input is ____________ |
| A. | 2.67 kWh |
| B. | 3 kWh |
| C. | 2.5 kWh |
| D. | 3.5 kWh |
| Answer» B. 3 kWh | |
| 11. |
The impedance matrices of two, two-port network are given by [3 2; 2 3] and [15 5; 5 25]. The impedance matrix of the resulting two-port network when the two networks are connected in series is ____________ |
| A. | [3 5; 2 25] |
| B. | [18 7; 7 28] |
| C. | [15 2; 5 3] |
| D. | Indeterminate |
| Answer» C. [15 2; 5 3] | |
| 12. |
A two branch parallel circuit has a 50 resistance and 10 H inductance in one branch and a 1 F capacitor in the second branch. It is fed from 220 V ac supply, at resonance, the input impedance of the circuit is _____________ |
| A. | 447.2 |
| B. | 500 |
| C. | 235.48 |
| D. | 325.64 |
| Answer» B. 500 | |
| 13. |
Given I (t) = 10[1 + sin (- t)]. The RMS value of I(t) is ____________ |
| A. | 10 |
| B. | 5 |
| C. | ( sqrt{150} ) |
| D. | 105 |
| Answer» D. 105 | |
| 14. |
A capacitor of 110 V, 50 Hz is needed for AC supply. The peak voltage of the capacitor should be ____________ |
| A. | 110 V |
| B. | 460 V |
| C. | 220 V |
| D. | 230 V |
| Answer» D. 230 V | |