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 μF capacitor is across a 2 kHz sine wave signal source. The capacitive reactance is
- (A) 170 Ω
- (B) 17 Ω
- (C) 0.000169 Ω
- (D) 1.7 Ω
3. Four 0.15 μF capacitors are in parallel. The total capacitance is
- (A) 0.15 μF
- (B) 0.30 μF
- (C) 0.6 μF
- (D) 0.8 μF
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 μF 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 μF
- (B) 220 μF
- (C) 2,200 μF
- (D) 22,200 μF
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 μC and V = 12 V?
- (A) 720 μF
- (B) 5 μF
- (C) 50 μF
- (D) 12 μF