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Alternating Current Test - 28

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Alternating Current Test - 28
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  • Question 1
    1 / -0
    In a series LCRACLCR\, AC circuit, the current is maximum when the impedance is equal to:
    Solution
    In L-C-R circuit, the current
    I=E0R2+(XLXC)2I=\displaystyle\frac{E_0}{\sqrt{R^2+(X_L-X_C)^2}}
    When impedance Z=RZ=R, i.e., XL=XCX_L=X_C the current in the L-C-R circuit will be maximum.
  • Question 2
    1 / -0
    In an oscillating system, a restoring force is a must. In an L-C circuit, the restoring force is provided by a/an
    Solution

  • Question 3
    1 / -0
    Alternating current is flowing in inductance LL and resistance RR. The frequency of source is ω/2π\omega/2\pi Which of the following statement in correct:
    Solution

  • Question 4
    1 / -0
    If we increase the driving frequency in a circuit with a  purely resistive load, then amplitude VRV_R
    Solution
    We know that VRV_R does not depend on driving frequency in a purely resistive circuit.So,If we increase the driving frequency in a circuit with a  purely resistive load, then amplitude remain in the same.
    Therefore, A is correct option.
  • Question 5
    1 / -0
    The ratio of peak value and r.m.s value of an alternating current is
    Solution
    As we know,
     V0=Vrms×2V_0=V_{rms} \times \sqrt 2
    so, 
    V0Vrms=2\dfrac{V_0}{V_{rms}}=\sqrt 2
  • Question 6
    1 / -0
    Current in the circuit is wattless, if
    Solution

    Current in the circuit is wattless, 
    Because power = i2R i^2R , if R=0 R = 0 , then P=0 P = 0 .
  • Question 7
    1 / -0
    The power factor of L-R circuit is :
    Solution

  • Question 8
    1 / -0
    Statement A: With an increase in the frequency of AC supply inductive reactance increases.
    Statement B: With an increase in the frequency of AC supply capacitive reactance increase.
    Solution
    ZL=WLZ_L=WL              ZC=1wcZ_C=\dfrac{1}{wc}

    w,ZLZcw\uparrow, Z_L\uparrow Z_c\downarrow
  • Question 9
    1 / -0
    In series L-C-R resonant circuit, to increase the resonant frequency :
    Solution
    Resonant frequency =1LC=\dfrac{1}{\sqrt{LC}}

    LC  if ωr LC  \downarrow \ if \ \omega_r  \uparrow
  • Question 10
    1 / -0
    At low frequency a condenser offers :
    Solution
    Z=1wcZ=\dfrac{1}{wc}

    wZw\downarrow Z\uparrow
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