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MCQs

Total Questions : 162 | Page 6 of 17 pages
Question 51. 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 voltage across the inductor.
  1.    52V
  2.    82V
  3.    65V
  4.    76V
 Discuss Question
Answer: Option B. -> 82V
Answer: (b).82V
Question 52. For an RL circuit, the phase angle is always ________
  1.    Positive
  2.    Negative
  3.    0
  4.    90
 Discuss Question
Answer: Option B. -> Negative
Answer: (b).Negative
Question 53. What is φ in terms of voltage?
  1.    φ=cos¯¹V/VR
  2.    φ=cos¯¹V*VR
  3.    φ=cos¯¹VR/V
  4.    φ=tan¯¹V/VR
 Discuss Question
Answer: Option C. -> φ=cos¯¹VR/V
Answer: (c).φ=cos¯¹VR/V
Question 54. What is impedance at resonance?
  1.    maximum
  2.    minimum
  3.    zero
  4.    cannot be determined
 Discuss Question
Answer: Option B. -> minimum
Answer: (b).minimum
Question 55. What is the resonance frequency of ac circuit?
  1.    1/√LC
  2.    √(L/C)
  3.    √LC
  4.    LC
 Discuss Question
Answer: Option A. -> 1/√LC
Answer: (a).1/√LC
Question 56. What is sinϕ from impedance triangle?
  1.    Xₗ/R
  2.    Xₗ/Z
  3.    R/Z
  4.    Z/R
 Discuss Question
Answer: Option B. -> Xₗ/Z
Answer: (b).Xₗ/Z
Question 57. What is the value of impedance at resonance?
  1.    Xₗ
  2.    Xc
  3.    R
  4.    0
 Discuss Question
Answer: Option C. -> R
Answer: (c).R
Question 58. What is the resistance offered by a capacitor?
  1.    Susceptance
  2.    Conductance
  3.    Admittance
  4.    Reactance
 Discuss Question
Answer: Option D. -> Reactance
Answer: (d).Reactance
Question 59. What is imaginary part of the impedance of RLC circuit?
  1.    Resistance
  2.    Conductance
  3.    Admittance
  4.    Reactance
 Discuss Question
Answer: Option D. -> Reactance
Answer: (d).Reactance
Question 60. What is the relation between reactance, resistance and impedance?
  1.    Z=R+jX
  2.    Z=R+X
  3.    Z=R-X
  4.    Z=R-jX
 Discuss Question
Answer: Option A. -> Z=R+jX
Answer: (a).Z=R+jX

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