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MCQs

Total Questions : 330 | Page 30 of 33 pages
Question 291. . The material used between the plates of a capacitor is called its:
  1.    insulation material
  2.    dielectric material
  3.    separation material
  4.    plate-divider material
 Discuss Question
Answer: Option B. -> dielectric material
Question 292. . An 8 V power source is charging a capacitor. How many volts will be across the capacitor at the second time constant?
  1.    1 volt
  2.    3 volts
  3.    5 volts
  4.    7 volts
 Discuss Question
Answer: Option D. -> 7 volts
Question 293. . When a circuit consists of a capacitor and a resistor in series with a voltage source, and the voltage across the resistor is zero, then the capacitor is:
  1.    charging
  2.    discharging
  3.    fully charged
  4.    fully discharged
 Discuss Question
Answer: Option C. -> fully charged
Question 294. . A practical capacitor
  1.    is a short to dc
  2.    looks like a capacitor in parallel with a resistor
  3.    is an open to ac
  4.    stores energy in a magnetic field
 Discuss Question
Answer: Option B. -> looks like a capacitor in parallel with a resistor
Question 295. . In an ac circuit, a capacitor and an output resistor are connected in series with an ac signal. What filter action will be the result?
  1.    bandpass
  2.    low-pass
  3.    high-pass
  4.    band-stop
 Discuss Question
Answer: Option C. -> high-pass
Question 296. . Which of the following is the reference vector for parallel RC circuits?
  1.    R
  2.    I
  3.    C
  4.    V
 Discuss Question
Answer: Option D. -> V
Question 297. . What is the total current for a 5 MHz, 1 Vac circuit that consists of a 27 pF capacitor and a 1 k resistor connected in parallel?
  1.    459 A
  2.    647 A
  3.    1.31 mA
  4.    1.85 mA
 Discuss Question
Answer: Option C. -> 1.31 mA
Question 298. . What do variable capacitors use for dielectric?
  1.    ceramic, electrolytic, mica, or paper
  2.    air, ceramic, mica, or plastic
  3.    ceramic, paper, plastic, or mica
  4.    mica, ceramic, plastic, or electrolytic
 Discuss Question
Answer: Option B. -> air, ceramic, mica, or plastic
Question 299. . The strength of an electric field at a given point is proportional to the potential difference on the plates and inversely proportional to the:
  1.    plate separation
  2.    negative plate only
  3.    field strength
  4.    charge difference
 Discuss Question
Answer: Option A. -> plate separation
Question 300. . What is the value of a capacitor that can store two coulombs of charge when 500 volts is applied across its plates?
  1.    4 F
  2.    250 F
  3.    4,000 F
  4.    250 F
 Discuss Question
Answer: Option C. -> 4,000 F

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