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. |
The four arms of an AC bridge network are as follows:Arm AB: unknown impedanceArm BC: standard capacitor C2 of 1000pfArm CD: a non-inductive resistance of R of 100 Ω in parallel to a capacitor of 0.01 μFArm DA: a non-inductive resistance of 1000 ΩThe supply frequency is 50 Hz and connected across terminals B and D. If the bridge is balanced with the above value, determine the value of unknown Impedance. |
| A. | 10 kΩ |
| B. | 100 kΩ |
| C. | 250 kΩ |
| D. | 20 kΩ |
| Answer» B. 100 kΩ | |
| 2. |
In the figure below, the values of the resistance R1 and inductance L1 of a coil are to be calculated after the bridge is balanced. The values are _________________ |
| A. | 375 Ω and 75 mH |
| B. | 75 Ω and 150 mH |
| C. | 37.5 Ω and 75 mH |
| D. | 75 Ω and 75 mH |
| Answer» B. 75 Ω and 150 mH | |
| 3. |
In Maxwell’s capacitance bridge for calculating unknown inductance, the various values at balance are, R1 = 300 Ω, R2 = 700 Ω, R3 = 1500 Ω, C4 = 0.8 μF. The values of R1, L1 and Q factor, if the frequency is 1100 Hz are ____________ |
| A. | 240 Ω, 0.12 H, 3.14 |
| B. | 140 Ω, 0.168 H, 8.29 |
| C. | 140 Ω, 0.12 H, 5.92 |
| D. | 240 Ω, 0.36 H, 8.29 |
| Answer» C. 140 Ω, 0.12 H, 5.92 | |
| 4. |
In the Owen’s bridge shown in below figure, Z1 = 200∠60°, Z2 = 400∠-90°, Z3 = 300∠0°, Z4 = 400∠30°. Then, |
| A. | Bridge is balanced with given impedance values |
| B. | Bridge can be balanced, if Z4 = 600∠60° |
| C. | Bridge can be balanced, if Z3 = 400∠0° |
| D. | Bridge cannot be balanced with the given configuration |
| Answer» E. | |
| 5. |
In the figure given below, a 220 V 50 Hz supplies a 3-phase balanced source. The pressure Coil (PC) and Current Coil (CC) of a watt-meter are connected to the load as shown. The watt-meter reading is _________ |
| A. | Zero |
| B. | 1600 W |
| C. | 242 W |
| D. | 400 W |
| Answer» D. 400 W | |
| 6. |
The meter constant of a single-phase, 230 V induction watt-meter is 600 rev/kW-h. The speed of the meter disc for a current of 15 A at 0.8 power factor lagging will be? |
| A. | 30.3 rpm |
| B. | 25.02 rpm |
| C. | 27.6 rpm |
| D. | 33.1 rpm |
| Answer» D. 33.1 rpm | |
| 7. |
In the Two wattmeter method of measuring power in a balanced three-phase circuit, one wattmeter shows zero and the other positive maximum. The load power factor is ___________ |
| A. | 0 |
| B. | 0.5 |
| C. | 0.866 |
| D. | 1.0 |
| Answer» C. 0.866 | |
| 8. |
A 200/1 Current Transformer (CT) is wound with 400 turns on the secondary on a toroidal core. When it carries a current of 180 A on the primary, the ratio is found to be -0.5%. If the number of secondary turns is reduced by 1, the new ratio error (in %) will be? |
| A. | 0 |
| B. | -0.5 |
| C. | -1.0 |
| D. | -2.0 |
| Answer» D. -2.0 | |
| 9. |
A resistor of 10 kΩ with a tolerance of 5% is connected in parallel with 5 kΩ resistors of 10% tolerance. The tolerance limit is __________ |
| A. | 9% |
| B. | 12.4% |
| C. | 8.33% |
| D. | 7.87% |
| Answer» D. 7.87% | |
| 10. |
The simultaneous applications of signals x (t) and y (t) to the horizontal and vertical plates respectively, of an oscilloscope, produce a vertical figure of 8 displays. If P and Q are constants and x(t) = P sin (4t + 30), then y(t) is equal to _________ |
| A. | Q sin (4t – 30) |
| B. | Q sin (2t + 15) |
| C. | Q sin (8t + 60) |
| D. | Q sin (4t + 30) |
| Answer» C. Q sin (8t + 60) | |
| 11. |
The readings of polar type potentiometer areI = 12.4∠27.5°V = 31.5∠38.4°Then, Reactance of the coil will be? |
| A. | 2.51 Ω |
| B. | 2.56 Ω |
| C. | 2.54 Ω |
| D. | 2.59 Ω |
| Answer» D. 2.59 Ω | |
| 12. |
The voltage drop across a standard resistor of 0.2 Ω is balanced at 83 cm. The magnitude of the current, if the standard cell emf of 1.53 V is balanced at 42 m is ___________ |
| A. | 13.04 A |
| B. | 10 A |
| C. | 14.95 A |
| D. | 12.56 A |
| Answer» D. 12.56 A | |
| 13. |
In the Wheatstone bridge shown below, if the resistance in each arm is increased by 0.05%, then the value of Vout will be? |
| A. | 50 mV |
| B. | Zero |
| C. | 5mV |
| D. | 0.1mV |
| Answer» C. 5mV | |
| 14. |
An RLC series circuit has a resistance R of 20Ω and a current which lags behind the applied voltage by 45°. If the voltage across the inductor is twice the voltage across the capacitor, the value of inductive resistance is ____________ |
| A. | 10 Ω |
| B. | 20 Ω |
| C. | 40 Ω |
| D. | 60 Ω |
| Answer» D. 60 Ω | |
| 15. |
If the 3-phase balanced source in the given figure delivers 1500 W at a leading power factor of 0.844, then the value of ZL is approximately __________ |
| A. | 90∠32.44° |
| B. | 80∠32.44° |
| C. | 80∠-32.44° |
| D. | 90∠-32.44° |
| Answer» E. | |