Capacitors MCQ

Test your knowledge with important Capacitors MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more Capacitors MCQs at Bissoy

• A 0.00022 F capacitor equals how many micro-farads?
  ক

  22 µF

  খ

  220 µF

  গ

  2,200 µF

  ঘ

  22,200 µF
• Two series capacitors (one 2 µF, the other of unknown value) are charged from a 24 V source. The 2 µF capacitor is charged to 16 V and the other to 8 V. The value of the unknown capacitor is
  ক

  1 µF

  খ

  2 µF

  গ

  4 µF

  ঘ

  8 µF
• The ohm is the unit of capacitance.
  ক

  True

  খ

  False
• Four 0.15 µF capacitors are in parallel. The total capacitance is
  ক

  0.15 µF

  খ

  0.30 µF

  গ

  0.6 µF

  ঘ

  0.8 µF
• A 10 µF, 20 µF, 22 µF, and 100 µF capacitor are in parallel. The total capacitance is
  ক

  2.43 µF

  খ

  4.86 µF

  গ

  100 µF

  ঘ

  152 µF
• A 4.7 MΩ resistor is in series with a 0.015 µF capacitor. The combination is across a 12 V source. How long does it take the capacitor to fully charge?
  ক

  35 ms

  খ

  352 ms

  গ

  3.5 ms

  ঘ

  70.5 ms
• A 220 Ω resistor is in series with a 2.2 µF capacitor. The time constant is
  ক

  48 µs

  খ

  480 µs

  গ

  2.42 µs

  ঘ

  24 µs
• Total parallel capacitance is less than that of the smallest capacitor in parallel.
  ক

  True

  খ

  False
• An uncharged capacitor and a 1 kΩ 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
  ক

  6 V

  খ

  3 V

  গ

  2 V

  ঘ

  0 V
• Capacitance is directly proportional to plate area and plate separation.
  ক

  True

  খ

  False
• XC is inversely proportional to frequency and capacitance.
  ক

  True

  খ

  False
• Energy is stored by a capacitor in a magnetic field.
  ক

  True

  খ

  False
• A 0.01 µF capacitor equals how many picofarads?
  ক

  100 pF

  খ

  1,000 pF

  গ

  10,000 pF

  ঘ

  100,000 pF
• The dielectric constant is the ability of a material to establish an electric field.
  ক

  True

  খ

  False
• A capacitor and a resistor are connected in series to a sine wave generator. The frequency is set so that the capacitive reactance is equal to the resistance and, thus, an equal amount of voltage appears across each component. If the frequency is increased
  ক

  VR > VC

  খ

  VC > VR

  গ

  VR = VC

  ঘ

  VR and VC = 0
• Of the following capacitors, which one has the highest dielectric constant?
  ক

  Air

  খ

  Mica

  গ

  Glass

  ঘ

  Paper
• When the voltage across a capacitor is tripled, the stored charge
  ক

  Triples

  খ

  Is cut to one-third

  গ

  Stays the same

  ঘ

  Doubles
• A sine wave voltage is applied across a capacitor. When the frequency of the voltage is decreased, the current
  ক

  Increases

  খ

  Remains constant

  গ

  Decreases

  ঘ

  Ceases
• Which of the following capacitors is polarized?
  ক

  Mica

  খ

  Ceramic

  গ

  Plastic-film

  ঘ

  Electrolytic
• A 2 µF, a 4 µF, and a 10 µF capacitor are connected in series. The total capacitance is less than
  ক

  2 µF

  খ

  4 µF

  গ

  10 µF

  ঘ

  1.5 µF
• When the plate area of a capacitor increases,
  ক

  The capacitance increases

  খ

  The capacitance decreases

  গ

  The capacitance is unaffected

  ঘ

  The voltage it can withstand increases
• A 12 kHz voltage is applied to a 0.33 µF capacitor, and 200 mA of rms current is measured. What is the value of the voltage?
  ক

  8 V

  খ

  80 V

  গ

  800 V

  ঘ

  0.88 V
• A 0.47 µF capacitor is across a 2 kHz sine wave signal source. The capacitive reactance is
  ক

  170 Ω

  খ

  17 Ω

  গ

  0.000169 Ω

  ঘ

  1.7 Ω
• Two 0.68 µF capacitors are connected in series across a 10 kHz sine wave signal source. The total capacitive reactance is
  ক

  46.8 Ω

  খ

  4.68 Ω

  গ

  23.41 Ω

  ঘ

  11.70 Ω
• A capacitor blocks A.C. but passes D.C.
  ক

  True

  খ

  False
• The true power in a capacitor is zero.
  ক

  True

  খ

  False
• A capacitor of 0.02 µF is larger than
  ক

  0.000020 F

  খ

  200,000 pF

  গ

  2,000 pF

  ঘ

  All of the above
• A capacitor of 2,000 pF is greater than
  ক

  0.02 µF

  খ

  0.002 µF

  গ

  0.0002 µF

  ঘ

  0.0000002 F
• Five time constants are required for a capacitor to charge fully or discharge fully.
  ক

  True

  খ

  False
• Voltage leads current by 90° in a capacitor.
  ক

  True

  খ

  False