Capacitors Electrical Engineering MCQ Test - ObjectiveBooks

Capacitors Electrical Engineering MCQ Test

Practice Test: Question Set - 03


1. When the voltage across a capacitor is tripled, the stored charge
    (A) Triples
    (B) Is cut to one-third
    (C) Stays the same
    (D) Doubles

2. A 0.47 Î¼F capacitor is across a 2 kHz sine wave signal source. The capacitive reactance is
    (A) 170 Î©
    (B) 17 Î©
    (C) 0.000169 Î©
    (D) 1.7 Î©

3. Four 0.15 Î¼F capacitors are in parallel. The total capacitance is
    (A) 0.15 Î¼F
    (B) 0.30 Î¼F
    (C) 0.6 Î¼F
    (D) 0.8 Î¼F

4. Which of the following capacitors is polarized?
    (A) Mica
    (B) Ceramic
    (C) Plastic-film
    (D) Electrolytic

5. Energy is stored by a capacitor in a magnetic field.
    (A) True
    (B) False

6. Of the following capacitors, which one has the highest dielectric constant?
    (A) Air
    (B) Mica
    (C) Glass
    (D) Paper

7. A 0.01 Î¼F capacitor equals how many picofarads?
    (A) 100 pF
    (B) 1,000 pF
    (C) 10,000 pF
    (D) 100,000 pF

8. 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
    (A) VR > VC
    (B) VC > VR
    (C) VR = VC
    (D) VR and VC = 0

9. A 0.00022 F capacitor equals how many micro-farads?
    (A) 22 Î¼F
    (B) 220 Î¼F
    (C) 2,200 Î¼F
    (D) 22,200 Î¼F

10. A 330 pF capacitor and a 220 pF capacitor are each connected across a 6 V dc source. The voltage across the 330 pF capacitor is
    (A) 3 V
    (B) 6 V
    (C) 4 V
    (D) 0 V

11. Five time constants are required for a capacitor to charge fully or discharge fully.
    (A) True
    (B) False

12. What is the capacitance when Q = 60 Î¼C and V = 12 V?
    (A) 720 Î¼F
    (B) 5 Î¼F
    (C) 50 Î¼F
    (D) 12 Î¼F

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