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MCQs

Total Questions : 162 | Page 8 of 17 pages
Question 71. Find the value of the instantaneous voltage if the resistance is 2 ohm and the instantaneous current in the circuit is 5A.Find The Value Of The Instantaneous Voltage If The Resistanc...
  1.    5V
  2.    2V
  3.    10V
  4.    2.5V
 Discuss Question
Answer: Option C. -> 10V
Answer: (c).10V
Question 72. The power for a purely resistive circuit is zero when?The Power For A Purely Resistive Circuit Is Zero When?
  1.    Current is zero
  2.    Voltage is zero
  3.    Both current and voltage are zero
  4.    Either current or voltage is zero
 Discuss Question
Answer: Option D. -> Either current or voltage is zero
Answer: (d).Either current or voltage is zero
Question 73. In an RLC circuit, the power factor is always ____________
  1.    Positive
  2.    Negative
  3.    Depends on the circuit
  4.    Zero
 Discuss Question
Answer: Option C. -> Depends on the circuit
Answer: (c).Depends on the circuit
Question 74. When is tanφ negative?
  1.    When inductive reactance is less than capacitive reactance
  2.    When inductive reactance is greater than capacitive reactance
  3.    When inductive reactance is equal to capacitive reactance
  4.    When inductive reactance is zero
 Discuss Question
Answer: Option A. -> When inductive reactance is less than capacitive reactance
Answer: (a).When inductive reactance is less than capacitive reactance
Question 75. When is tanφ positive?
  1.    When inductive reactance is less than capacitive reactance
  2.    When inductive reactance is greater than capacitive reactance
  3.    When inductive reactance is equal to capacitive reactance
  4.    When inductive reactance is zero
 Discuss Question
Answer: Option B. -> When inductive reactance is greater than capacitive reactance
Answer: (b).When inductive reactance is greater than capacitive reactance
Question 76. In an RLC series phasor, we start drawing the phasor from which quantity?
  1.    Voltage
  2.    Resistance
  3.    Impedance
  4.    Current
 Discuss Question
Answer: Option D. -> Current
Answer: (d).Current
Question 77. Which of the following is not ac waveform?
  1.    sinusoidal
  2.    square
  3.    constant
  4.    triangular
 Discuss Question
Answer: Option C. -> constant
Answer: (c).constant
Question 78. What is not a frequency for ac current?
  1.    50 Hz
  2.    55 Hz
  3.    0Hz
  4.    60 Hz
 Discuss Question
Answer: Option C. -> 0Hz
Answer: (c).0Hz
Question 79. 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 current in the circuit.
  1.    0.01 A
  2.    0.2 A
  3.    0.02 A
  4.    0.002 A
 Discuss Question
Answer: Option B. -> 0.2 A
Answer: (b).0.2 A
Question 80. 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 capacitive reactance in the circuit.
  1.    316 ohm
  2.    195 ohm
  3.    124 ohm
  4.    212 ohm
 Discuss Question
Answer: Option D. -> 212 ohm
Answer: (d).212 ohm

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