Q.1

A resistor is in series with a 2.2 F capacitor. The time constant is

  • 48 s
  • 480 s
  • 2.42 s
  • 24 s
Q.2

When the voltage across a capacitor is tripled, the stored charge

  • triples
  • is cut to one-third
  • stays the same
  • doubles
Q.3

When the plate area of a capacitor increases,

  • the capacitance increases
  • the capacitance decreases
  • the capacitance is unaffected
  • the voltage it can withstand increases.
Q.4

AkHz voltage is applied to a 0.F capacitor, andmA of rms current is measured. What is the value of the voltage?

  • 8 V
  • 80 V
  • 80 mV
  • 800 mV
Q.5

When the plate area of a capacitor increases,

  • the capacitance increases
  • the capacitance decreases
  • the capacitance is unaffected
  • the voltage it can withstand increases.
Q.6

What is the capacitance when Q =C and V =V?

  • 720 F
  • 5 F
  • 50 F
  • 12 F
Q.7

A resistor is in series with a 2.2 F capacitor. The time constant is

  • 48 s
  • 480 s
  • 2.42 s
  • 24 s
Q.8

A resistor is in series with a 2.2 F capacitor. The time constant is

  • 48 s
  • 480 s
  • 2.42 s
  • 24 s
Q.9

AkHz voltage is applied to a 0.F capacitor, andmA of rms current is measured. What is the value of the voltage?

  • 8 V
  • 80 V
  • 80 mV
  • 800 mV
Q.10

What is the capacitance when Q =C and V =V?

  • 720 F
  • 5 F
  • 50 F
  • 12 F
Q.11

Five time constants are required for a capacitor to charge fully or discharge fully.

  • True
  • False
Q.12

XC is inversely proportional to frequency and capacitance.

  • True
  • False
Q.13

The ohm is the unit of capacitance.

  • True
  • False
Q.14

Capacitance is directly proportional to plate area and plate separation.

  • True
  • False
Q.15

Voltage leads current byin a capacitor.

  • True
  • False
Q.16

The true power in a capacitor is zero.

  • True
  • False
Q.17

A capacitor blocks ac but passes dc.

  • True
  • False
Q.18

The dielectric constant is the ability of a material to establish an electric field.

  • True
  • False
Q.19

Total parallel capacitance is less than that of the smallest capacitor in parallel.

  • True
  • False
Q.20

Energy is stored by a capacitor in a magnetic field.

  • True
  • False
0 h : 0 m : 1 s