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. The 2-port network shown in the circuit given below is connected in parallel with another 2-port network which has y11 = –y12 = –y21 = y22 = Y

    The y-parameters of the composite network will satisfy which one of the following?








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    Given y11 = –y12 = –y21 = y22 = Y

    From figure I1 = 0.V1 + 0V2 ....(A)
    I2 = gV1 + 0V2 ....(B)
    On comparing equation (A) and (B) with standard equation
    I1 = Y11 V1 + Y12 V2
    and I2 = Y21 Y1 + Y22 V2,
    we get Y21 = g According to the given condition the given 2-port network is connected in parallel with the network whose Y-parameters are given. So, Y-parameters of the composite network will satisfy only option (C).
    i.e. Y21 = – y + g

    Correct Option: C

    Given y11 = –y12 = –y21 = y22 = Y

    From figure I1 = 0.V1 + 0V2 ....(A)
    I2 = gV1 + 0V2 ....(B)
    On comparing equation (A) and (B) with standard equation
    I1 = Y11 V1 + Y12 V2
    and I2 = Y21 Y1 + Y22 V2,
    we get Y21 = g According to the given condition the given 2-port network is connected in parallel with the network whose Y-parameters are given. So, Y-parameters of the composite network will satisfy only option (C).
    i.e. Y21 = – y + g

  1. What is the locus of the tip of the voltage phasor across R in a series R-L-C circuit?








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    The locus of the tip of the voltage phasor across R in a series R-L-C circuit will be a circle.

    Correct Option: C

    The locus of the tip of the voltage phasor across R in a series R-L-C circuit will be a circle.

  1. Consider the following circuit:

    If V1 = 5V and V2 = 3 V, then what is the input impedance of the CRO in the above circuit?








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    The given circuit.

    Let the input impedance of CRO is R2 the given circuit can be redrawn as shown below

    Applying voltage divider rule

    V2 = V1 ×
    R2
    R1 + R2

    3V = 5
    V × R2
    1 MΩ + R2

    or 5R2 = 3 R2 + 3
    or 2R2 = 3
    or R2 = 1.5 MΩ

    Correct Option: B

    The given circuit.

    Let the input impedance of CRO is R2 the given circuit can be redrawn as shown below

    Applying voltage divider rule

    V2 = V1 ×
    R2
    R1 + R2

    3V = 5
    V × R2
    1 MΩ + R2

    or 5R2 = 3 R2 + 3
    or 2R2 = 3
    or R2 = 1.5 MΩ

  1. Consider the following circuit:

    What is power delivered to resistor R in the above circuit?








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    The given circuit

    The given circuit can be redrawn as shown below.

    From above figure
    P/Q = R/S
    i.e.
    60/120 = 30/60 (Wheatstone bridge)
    Therefore, power delivered to resistor R is zero watt.

    Correct Option: B

    The given circuit

    The given circuit can be redrawn as shown below.

    From above figure
    P/Q = R/S
    i.e.
    60/120 = 30/60 (Wheatstone bridge)
    Therefore, power delivered to resistor R is zero watt.

  1. Consider the following circuit:

    In the above circuit, the current I2 is 2 A when the value of R1 is 20Ω. What will be the value of I2 when R1 is changed to 10Ω?








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    Since the resistance R is connected to a constant current source, therefore, the value of I2 will remain the same.

    Correct Option: B


    Since the resistance R is connected to a constant current source, therefore, the value of I2 will remain the same.