Network Elements and the Concept of Circuit

Network Elements and the Concept of Circuit

Easy Questions

Network Theory

Network Elements and the Concept of Circuit
Network theory miscellaneous
  1. In the given circuit, if |I1| = |I2| = 10A—










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    The given circuit arrangement

    Given |I1| = |I2| = 10 A. There will be no current in L so, remove L from circuit

    Current in capacitor = 8JA
    Current in resistence = 6A because |I1| = |I2| = 10 A

    I1= 6 + J8 = 10 tan–1
    8
    6

    Correct Option: C

    The given circuit arrangement

    Given |I1| = |I2| = 10 A. There will be no current in L so, remove L from circuit

    Current in capacitor = 8JA
    Current in resistence = 6A because |I1| = |I2| = 10 A

    I1= 6 + J8 = 10 tan–1
    8
    6

  1. A two port network is reciprocal, if and only if—








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    A two port network is reciprocal, if and only if
    BC – AD = – 1

    Correct Option: B

    A two port network is reciprocal, if and only if
    BC – AD = – 1

  1. In the circuit shown below, the switch is closed at t = 0. The current through the capacitor will decrease exponentially with a time constant—










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    When switch is closed the given circuit can be redrawn as

    The time constant of the circuit, τ = Req. C
    Where Req = Effective resistance as seen from the terminal where capacitor is connected keeping all the independent energy sources are replaced by their internal resistance.
    Now, the above circuit can be redrawn as shown below.

    Thus, Req = 1Ω C = IF
    τ = Req. C = | × | = 1 sec.

    Correct Option: B

    When switch is closed the given circuit can be redrawn as

    The time constant of the circuit, τ = Req. C
    Where Req = Effective resistance as seen from the terminal where capacitor is connected keeping all the independent energy sources are replaced by their internal resistance.
    Now, the above circuit can be redrawn as shown below.

    Thus, Req = 1Ω C = IF
    τ = Req. C = | × | = 1 sec.

  1. In the circuit shown below, steady state was reached when the switch s was open. The switch was closed at t = 0. The initial value of the current through the capacitor 2C is:








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    At steady state switch was open & capacitor → open ⇒ at t = 0 switch is closed

    I =
    18
    2 + 4

    = 3 Amp
    I =
    10 - 4
    		-
    4
    		= 3.1 = 2A
    2
    4


    Correct Option: C

    At steady state switch was open & capacitor → open ⇒ at t = 0 switch is closed

    I =
    18
    2 + 4

    = 3 Amp
    I =
    10 - 4
    		-
    4
    		= 3.1 = 2A
    2
    4


  1. Norton theorems results in—








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    NA

    Correct Option: B

    NA