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Network Theory Multiple Choice Questions | MCQs | Quiz

Network Theory Interview Questions and Answers
Practice Network Theory questions and answers for interviews, campus placements, online tests, aptitude tests, quizzes and competitive exams.

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•   Circuit Elements
•   Voltage & Current Sources
•   Ohm's Law
•   Kirchhoffs Current Law
•   Kirchhoffs Voltage Law
•   Tree & Co-Tree
•   Tie Set Matrix
•   Tree Branch Voltages
•   Mesh Analysis
•   Supermesh Analysis
•   Nodal Analysis
•   Supernode Analysis
•   Star Delta Transformation
•   Superposition Theorem
•   Thevenins Theorem
•   Nortons Theorem
•   Reciprocity Theorem
•   Compensation Theorem
•   Power Transfer Theorem
•   Tellegens Theorem
•   Millmans Theorem
•   Sine Wave Angular Relation
•   Sine Wave Voltage
•   Resistor Phase Relation
•   Impedence Diagram
•   Series Circuits
•   Parallel Circuits
•   Instantaneous Power
•   Average Power
•   Power Factors
•   Reactive Power
•   Mesh AC Analysis
•   Nodal AC Analysis
•   Superposition AC Theorem
•   Thevenins AC Theorem
•   Nortons AC Theorem
•   Power Transfer Theorem
•   Series Resonance
•   RLC Circuits Bandwidth
•   Parallel Resonance
•   Resonant Frequency
•   Polyphase System
•   Three Phase Sources
•   Star Delta Transformation
•   Star Connected System
•   Delta Connected System
•   Balanced Circuits
•   Unbalanced Circuits
•   Power Measurement
•   R-L Circuit DC Response
•   R-C Circuit DC Response
•   R-L-C Circuit DC Response
•   Sinusoidal R-L Circuits
•   Sinusoidal R-C Circuits
•   Sinusoidal R-L-C Circuits
•   Laplace Transforms
•   Operational Transforms
•   Inverse Transforms
•   S Domain Circuit Elements
•   Transfer Function
•   Impulse Function
•   Complex Frequency
•   Series & Parallel Elements
•   One Port & Two Port
•   Poles & Zeros
•   Driving Point Functions
•   Transfer Functions
•   Open Circuit Parameters
•   Short Circuit Parameters
•   Transmission Parameters
•   Different Parameters
•   Two Port Networks
•   Network Termination
•   Image Parameters
•   Filter Networks
•   Pass & Stop Band
•   Constant K Low Pass Filter
•   M-Derived T-Section
•   Attenuators
•   Inverse Network
•   Series Equalizer
•   Shunt Equalizer
•   Hurwitz Polynomials
•   Reactive One-Ports
•   Foster One Ports Method
•   Cauer One Ports Method
•   Foster R-L Network Method
•   Cauer R-L Network Method
•   Foster R-C Network Method
•   Cauer R-C Network Method

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Network Theory Questions and Answers – Power Measurement in Three-Phase Circuits

Posted on June 20, 2017 by Manish

This set of Network Theory Multiple Choice Questions & Answers focuses on “Power Measurement in Three-Phase Circuits”.

1. The wattmeter method is used to measure power in a three-phase load. The wattmeter readings are 400W and -35W. Calculate the total active power.
a) 360
b) 365
c) 370
d) 375
View Answer

Answer: b
Explanation: Wattmeters are generally used to measure power in the circuits. Total active power = W1 + W2 = 400 + (-35) =365W.
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2. In the question 2 find the power factor.
a) 0.43
b) 0.53
c) 0.63
d) 0.73
View Answer

Answer: a
Explanation: We know tanØ = √3((WR – WY)/(WR + WY)) => tanØ = √3 (400-(-35))/(400+(-35) )=2.064 => Ø = 64.15⁰. Power factor = 0.43.

3. Find the reactive power in the question 2.
a) 751.44
b) 752.44
c) 753.44
d) 754.44
View Answer

Answer: c
Explanation: Reactive power = √3VLILsinØ. We know that WR – WY = 400-(-35)) = 435 = VLILsinØ. Reactive power = √3 x 435 = 753.44 VAR.

4. The input power to a three-phase load is 10kW at 0.8 Pf. Two watt meters are connected to measure the power. Find the reading of higher reading wattmeter.
a) 7.165
b) 6.165
c) 6.165
d) 4.165
View Answer

Answer: a
Explanation: WR + WY = 10kW. Ø = cos-10.8=36.8o => tanØ = 0.75 = √3 (WR-WY)/(WR+WY )=(WR-WY)/10. WR-WY=4.33kW. WR+WY=10kW. WR=7.165kW.

5. Find the reading of higher reading wattmeter in the question 2.
a) 1.835
b) 2.835
c) 3.835
d) 4.835
View Answer

Answer: b
Explanation: WR + WY = 10kW. Ø = cos-10.8=36.8o => tanØ = 0.75 = √3 (WR-WY)/(WR+WY )=(WR-WY)/10. WR-WY=4.33kW. WR+WY=10kW. WY=2.835kW.
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6. The readings of the two watt meters used to measure power in a capacitive load are -3000W and 8000W respectively. Calculate the input power. Assume RYB sequence.
a) 5
b) 50
c) 500
d) 5000
View Answer

Answer: d
Explanation: Toatal power is the sum of the power in R and power in Y. So total power = WR+WY = -3000+8000 = 5000W

7. Find the power factor in the question 6.
a) 0.25
b) 0.5
c) 0.75
d) 1
View Answer

Answer: a
Explanation: As the load is capacitive, the wattmeter connected in the leading phase gives less value. WR=-3000. WY=8000. tanØ = √3 (8000-(-3000))/5000=3.81 => Ø = 75.29⁰ => cosØ = 0.25.

8. The wattmeter reading while measuring the reactive power with wattmeter is?
a) VLILsecØ
b) VLILsinØ
c) VLILtanØ
d) VLILcosØ
View Answer

Answer: b
Explanation: The wattmeter reading while measuring the reactive power with wattmeter is wattmeter reading = VLILsinØ VAR.

9. The total reactive power in the load while measuring the reactive power with wattmeter is?
a) √3VLILcosØ
b) √3VLILtanØ
c) √3VLILsinØ
d)√3 VLILsecØ
View Answer

Answer: c
Explanation: To obtain the reactive power, wattmeter reading is to be multiplied by √3. Total reactive power = √3VLILsinØ.

10. A single wattmeter is connected to measure reactive power of a three-phase, three-wire balanced load. The line current is 17A and line voltage is 440V. Calculate the power factor of the load if the reading of the wattmeter is 4488 VAR.
a) 0.6
b) 0.8
c) 1
d) 1.2
View Answer

Answer: b
Explanation: Wattmeter reading = VLILsinØ => 4488 = 440 x 17sinØ => sinØ = 0.6. Power factor = cosØ = 0.8.
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Sanfoundry Global Education & Learning Series – Network Theory.

To practice all areas of Network Theory, here is complete set of 1000+ Multiple Choice Questions and Answers.

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« Power Electronics Questions and Answers – Single Phase FW AC-DC-1
Power Electronics Questions and Answers – Single Phase FW AC-DC-2 »
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