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MCQs

Total Questions : 90 | Page 8 of 9 pages
Question 71.  
In a 20 Vac series RC circuit, if 20 V is read across the resistor and 40 V is measured across the capacitor, the applied voltage is
  1.    45 Vac
  2.    50 Vac
  3.    60 Vac
  4.    65 Vac
 Discuss Question
Answer: Option A. -> 45 Vac
Question 72.  What is the phase angle for a parallel circuit consisting of a 500 kHz, 5 Vac source with a 47 pF capacitor, and a 4.7 komega.gif resistor in parallel?
  1.    55.3°
  2.    –55.3°
  3.    34.8°
  4.    –34.8°
 Discuss Question
Answer: Option C. -> 34.8°
Question 73.  What is the effect of increasing the resistance in a series RC circuit?
  1.    There will be no effect at all.
  2.    The current will increase.
  3.    The phase shift will decrease.
  4.    The input voltage will increase.
 Discuss Question
Answer: Option C. -> The phase shift will decrease.
Question 74.  Which of the following is the reference vector for parallel RC circuits?
  1.    R
  2.    V
  3.    I
  4.    XC
 Discuss Question
Answer: Option B. -> V
Question 75.  As frequency increases
  1.    both series and parallel RC impedance decrease
  2.    series RC impedance decreases and parallel RC impedance increases
  3.    series RC impedance increases and parallel RC impedance decreases
  4.    both series and parallel RC impedance increase
 Discuss Question
Answer: Option A. -> both series and parallel RC impedance decrease
Question 76.  Which statement about a series RC circuit is true?
  1.    The capacitor's voltage drop is in phase with the resistor's voltage drop.
  2.    The current leads the source voltage.
  3.    The current lags the source voltage.
  4.    The resistor voltage lags the current.
 Discuss Question
Answer: Option B. -> The current leads the source voltage.
Question 77.  In a series RC circuit, the phase difference between the capacitor and the resistor voltages ___.
  1.    depends on the values of R and C
  2.    equals 0°
  3.    equals 90°
  4.    depends on the value of the input voltage
 Discuss Question
Answer: Option C. -> equals 90°
Question 78. . In a series RC circuit, the phase difference between the current and the source voltage _____.
  1.    depends on the values of R and C
  2.    equals 0°
  3.    equals 90°
  4.    depends on the amplitude of the input voltage
 Discuss Question
Answer: Option A. -> depends on the values of R and C
Question 79.  If the impedance equals 2 komega.gif in a parallel RC circuit, the admittance equals ___.
  1.    More information is needed in order to find the admittance.
  2.    2 kS
  3.    4 kS
  4.    500 µS
 Discuss Question
Answer: Option D. -> 500 µS
Question 80. . The hypotenuse of the right triangle of a vector diagram for R and XC is _______________.
  1.    impedance
  2.    current
  3.    voltage
  4.    power
 Discuss Question
Answer: Option A. -> impedance

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