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    National Institute of Technology Tiruchirappalli End Semester Examination - Jan. 2020 Session

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    pranav kumar
    This document contains a 14 question circuit theory exam for students of the National Institute of Technology Tiruchirappalli. The exam covers topics like power factor, RMS and average values of waveforms, branch circuit analysis, series RLC circuits, power factor correction, and mesh current analysis. It instructs students to answer all questions within the allotted time of 2 hours and provides sample circuit diagrams to aid in solving questions requiring circuit analysis.

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    National Institute of Technology Tiruchirappalli End Semester Examination - Jan. 2020 Session

    Uploaded by

    pranav kumar
    34 views3 pages
    This document contains a 14 question circuit theory exam for students of the National Institute of Technology Tiruchirappalli. The exam covers topics like power factor, RMS and average values of waveforms, branch circuit analysis, series RLC circuits, power factor correction, and mesh current analysis. It instructs students to answer all questions within the allotted time of 2 hours and provides sample circuit diagrams to aid in solving questions requiring circuit analysis.

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    Original Title

    Gv-1968-EEPC10-2

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    This document contains a 14 question circuit theory exam for students of the National Institute of Technology Tiruchirappalli. The exam covers topics like power factor, RMS and average values of waveforms, branch circuit analysis, series RLC circuits, power factor correction, and mesh current analysis. It instructs students to answer all questions within the allotted time of 2 hours and provides sample circuit diagrams to aid in solving questions requiring circuit analysis.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    34 views3 pages

    National Institute of Technology Tiruchirappalli End Semester Examination - Jan. 2020 Session

    Uploaded by

    pranav kumar
    This document contains a 14 question circuit theory exam for students of the National Institute of Technology Tiruchirappalli. The exam covers topics like power factor, RMS and average values of waveforms, branch circuit analysis, series RLC circuits, power factor correction, and mesh current analysis. It instructs students to answer all questions within the allotted time of 2 hours and provides sample circuit diagrams to aid in solving questions requiring circuit analysis.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 3

    NATIONAL INSTITUTE OF TECHNOLOGY TIRUCHIRAPPALLI

    END SEMESTER EXAMINATION - JAN. 2020 SESSION

    DEPARTMENT : EEE
    Students : I YEAR II Sem EEE ‘A’ Section
    Subject Code &Name : EEPC10 & CIRCUIT THEORY
    DATE & TIME OF EXAM : 30.07.2020 & 03.00 PM to 05.00PM
    Note to Student: TIME MANAGEMENT IS YOUR RESPONSIBILITY

    ANSWER ALL QUESTIONS Marks :30

    1. The power factor of a DC circuit is always_____________. (1)

    2. The r.m.s value of a sinusoidal AC current is equal to its value at an angle of _______degrees. (1)

    3. The r.m.s value and average value is the same in the case of _____________waveform. (1)

    4.Four branches terminate at a common node. The reference direction of each branch current (i1,i2,i3
    and i4) is toward the node. If i1 = 100 cos(wt+25o)A, i2 = 100 cos (wt+145o) and i3 = 100 cos (wt-
    95o)A, find i4. (2)

    5. A university student is making coffee while listening to a Buck’s game on the radio. At the same
    time, her roommate is watching the packers on a solid-state TV. All these appliances are supplied
    from a 120V branch circuit protected by a 20A circuit breaker. If the roommate turns on a portable
    heater, is the circuit breaker tripped? will the roommate able to use the heater if the coffeemaker is
    unplugged? (2)

    6.Find the reading of each wattmeter in the circuit shown in Fig.1 if ZA =20 ∠300, ZB =60∠00, and ZC
    =40∠-300. Show that the sum of the wattmeter readings equals the total average power delivered to
    the unbalanced three phase load. (3)

    Fig.1
    NATIONAL INSTITUTE OF TECHNOLOGY TIRUCHIRAPPALLI
    END SEMESTER EXAMINATION - JAN. 2020 SESSION

    7. A series RL circuit has a constant voltage V applied at t=0. At what time does VR =VL ? (2)

    8. A constant voltage is applied to a series RL circuit at t=0. The voltage across the inductance is
    20V at 3.46ms and 5V at 25ms. Obtain R if L=2H. (2)

    9. A 4500 VA load at power factor 0.75 lagging is supplied by a 60Hz source at effective voltage
    240V. Determine the parallel capacitance in microfarads necessary to improve the power factor to (i)
    0.9 lagging (ii) 0.9 leading. (3)

    10. Derive the Q of the series RLC resonance circuit. (3)

    11. A certain network consists of large number of ideal linear resistances, one of which is designated
    as R and two constant ideal sources. The power consumed by R is P1 when only the first source is
    active and P2 when only second source is active. In both sources are active simultaneously then
    the power consumed by R is _____________. (2)

    12. A circuit with a resistance R and a lossless inductance in series is connected across a supply (V)
    of known frequency (f). A capacitance C is now connected in series with RL, with V &f being
    constant. Justify the following statement with reasons. The current in the circuit normally
    increases with the introduction of C. Under what condition, the current may also decrease explain
    the condition with reason. (2)

    13. The three coupled coils shown in Fig.2 have coupling coefficients of 0.50. Obtain the equivalent
    inductance between the terminals AB. (2)

    Fig.2
    NATIONAL INSTITUTE OF TECHNOLOGY TIRUCHIRAPPALLI
    END SEMESTER EXAMINATION - JAN. 2020 SESSION

    14. Use the mesh-current method of circuit analysis to determine the power dissipated in the 4Ω
    resistor in the circuit shown in fig.3. (4)

    Fig.3

    *********************ALL THE BEST****************************

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