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MCQs

Total Questions : 162 | Page 9 of 17 pages
Question 81. In an AC circuit, resistance 50 Ω, inductance 0.3 H and capacitance 15 μF is connected to an AC voltage source 25 V, 50 Hz. Determine the inductive reactance in the circuit.
  1.    36 ohm
  2.    95 ohm
  3.    125 ohm
  4.    140 ohm
 Discuss Question
Answer: Option B. -> 95 ohm
Answer: (b).95 ohm
Question 82. In an AC circuit, resistance 50 Ω, inductance 0.3 H and capacitance 15 μF is connected to an AC voltage source 25 V, 50 Hz. Determine the impedance in the circuit.
  1.    110 ohm
  2.    100 ohm
  3.    125 ohm
  4.    140 ohm
 Discuss Question
Answer: Option C. -> 125 ohm
Answer: (c).125 ohm
Question 83. The correct expression for the instantaneous current if instantaneous voltage is Vm(sint) in a resistive circuit is?
  1.    1A
  2.    2A
  3.    3A
  4.    4A
 Discuss Question
Answer: Option B. -> 2A
Answer: (b).2A
Question 84. The correct expression for the instantaneous current if instantaneous voltage is Vm(sint) in an inductive circuit is?
  1.    i = Vm(sint)/Xₗ
  2.    i = Vm(cost)/Xₗ
  3.    i = -Vm(sint)/Xₗ
  4.    i = -Vm(cost)/Xₗ
 Discuss Question
Answer: Option D. -> i = -Vm(cost)/Xₗ
Answer: (d).i = -Vm(cost)/Xₗ
Question 85. Can ohm’s law be applied in an ac circuit?
  1.    Yes
  2.    No
  3.    Depends on the rms current
  4.    Depends on the rms voltage
 Discuss Question
Answer: Option A. -> Yes
Answer: (a).Yes
Question 86. The correct expression for the instantaneous current in a resistive circuit is?
  1.    i=Vm(sint)/R
  2.    i=Vm(cost)/R
  3.    i=V(sint)/R
  4.    i=V(cost)/R
 Discuss Question
Answer: Option A. -> i=Vm(sint)/R
Answer: (a).i=Vm(sint)/R
Question 87. Calculate the resistance in the circuit if the rms voltage is 20V and the rms current is 2A.
  1.    2 ohm
  2.    5 ohm
  3.    10 ohm
  4.    20 ohm
 Discuss Question
Answer: Option C. -> 10 ohm
Answer: (c).10 ohm
Question 88. In an inductive circuit, the voltage_______ the current?
  1.    Leads
  2.    Lags
  3.    Is greater than
  4.    Is less than
 Discuss Question
Answer: Option A. -> Leads
Answer: (a).Leads
Question 89. A resistance of 7 ohm is connected in series with an inductance of 31.8mH. The circuit is connected to a 100V 50Hz sinusoidal supply. Calculate the current in the circuit.
  1.    2.2A
  2.    4.2A
  3.    6.2A
  4.    8.2A
 Discuss Question
Answer: Option D. -> 8.2A
Answer: (d).8.2A
Question 90. In which device inductor cannot be used?
  1.    filter circuit
  2.    transformer
  3.    choke
  4.    dielectric
 Discuss Question
Answer: Option D. -> dielectric
Answer: (d).dielectric

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