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MCQs

Total Questions : 330 | Page 24 of 33 pages
Question 231. A capacitor consists of_________
  1.    Two conductors
  2.    Two semiconductors
  3.    Two dielectrics
  4.    Two insulators
 Discuss Question
Answer: Option A. -> Two conductors
Answer: (a).Two conductors
Question 232. Capacitor preferred when there is high frequency in the circuits is __________
  1.    Electrolyte capacitor
  2.    Mica capacitor
  3.    Air capacitor
  4.    Glass capacitor
 Discuss Question
Answer: Option B. -> Mica capacitor
Answer: (b).Mica capacitor
Question 233. For very low frequencies, capacitor acts as ________
  1.    Open circuit
  2.    Short circuit
  3.    Amplifier
  4.    Rectifier
 Discuss Question
Answer: Option A. -> Open circuit
Answer: (a).Open circuit
Question 234. What happens to the capacitance when the voltage across the capacitor increases?
  1.    Decreases
  2.    Increases
  3.    Becomes 0
  4.    No effect
 Discuss Question
Answer: Option D. -> No effect
Answer: (d).No effect
Question 235. A power factor of a circuit can be improved by placing which, among the following, in a circuit?
  1.    Inductor
  2.    Capacitor
  3.    Resistor
  4.    Switch
 Discuss Question
Answer: Option B. -> Capacitor
Answer: (b).Capacitor
Question 236. When the supply frequency increases, what happens to the capacitive reactance in the circuit?
  1.    Increases
  2.    Decreases
  3.    Remains the same
  4.    Becomes zero
 Discuss Question
Answer: Option B. -> Decreases
Answer: (b).Decreases
Question 237. Capacitors charge and discharge in __________ manner.
  1.    Linear
  2.    Constant
  3.    Square
  4.    Exponential
 Discuss Question
Answer: Option D. -> Exponential
Answer: (d).Exponential
Question 238. Calculate the time constant of a series RC circuit consisting of a 100microF capacitor in series with a 100ohm resistor.
  1.    0.1 sec
  2.    0.1 msec
  3.    0.01 sec
  4.    0.01 msec
 Discuss Question
Answer: Option C. -> 0.01 sec
Answer: (c).0.01 sec
Question 239. A 0.47 μF capacitor is across a 2 kHz sine wave signal source. The capacitive reactance is
  1.    17 Ω
  2.    0.000169 Ω
  3.    170 Ω
  4.    1.7 Ω
 Discuss Question
Answer: Option C. -> 170 Ω
Question 240. A 0.01 F capacitor equals how many picofarads?
  1.    100,000 pF
  2.    1,000 pF
  3.    100 pF
  4.    10,000 pF
 Discuss Question
Answer: Option D. -> 10,000 pF

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