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MCQs

Total Questions : 330 | Page 25 of 33 pages
Question 241. A 220 Ω resistor is in series with a 2.2 μF capacitor. The time constant is
  1.    2.42 μs
  2.    480 μs
  3.    48 μs
  4.    24 μs
 Discuss Question
Answer: Option B. -> 480 μs
Question 242. Four 0.15 μF capacitors are in parallel. The total capacitance is
  1.    0.8 μF
  2.    0.30 μF
  3.    0.6 μF
  4.    0.15 μF
 Discuss Question
Answer: Option C. -> 0.6 μF
Question 243. A 4.7 M Ω resistor is in series with a 0.015 μ F capacitor. The combination is across a 12 V source. How long does it take the capacitor to fully charge?
  1.    3.5 s
  2.    352 ms
  3.    70.5 ms
  4.    35 ms
 Discuss Question
Answer: Option B. -> 352 ms
Question 244. A 12 kHz voltage is applied to a 0.33 F capacitor, and 200 mA of rms current is measured. What is the value of the voltage?
  1.    800 mV
  2.    8 V
  3.    80 V
  4.    80 mV
 Discuss Question
Answer: Option B. -> 8 V
Question 245. Two 0.68 μ F capacitors are connected in series across a 10 kHz sine wave signal source. The total capacitive reactance is
  1.    46.8 Ω
  2.    4.68 Ω
  3.    23.41 Ω
  4.    11.7 Ω
 Discuss Question
Answer: Option A. -> 46.8 Ω
Question 246. Two series capacitors (one 2 μ F, the other of unknown value) are charged from a 24 V source. The 2 μ F capacitor is charged to 16 V and the other to 8 V. The value of the unknown capacitor is
  1.    8 μ F
  2.    4 μ F
  3.    1 μ F
  4.    2 μ F
 Discuss Question
Answer: Option B. -> 4 μ F
Question 247. A 0.00022 F capacitor equals how many microfarads?
  1.    22 μF
  2.    2,200 μF
  3.    220 μF
  4.    22,200 μF
 Discuss Question
Answer: Option C. -> 220 μF
Question 248. A 2 μ F, a 4 μ F, and a 10 μ F capacitor are connected in series. The total capacitance is less than
  1.    2 μ F
  2.    10 μ F
  3.    4 μ F
  4.    1.5 μ F
 Discuss Question
Answer: Option D. -> 1.5 μ F
Question 249. In Question 6, the capacitor will reach full charge in a time equal to approximately
  1.    RC
  2.    5 RC
  3.    6 RC
  4.    None of these
 Discuss Question
Answer: Option B. -> 5 RC
Question 250. An uncharged capacitor and a 1 k Ω resistor are connected in series with a switch and a 6 V battery. At the instant the switch is closed, the voltage across the capacitor is
  1.    0 V
  2.    6 V
  3.    2 V
  4.    3 V
 Discuss Question
Answer: Option A. -> 0 V

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