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- Question
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?
Options- A. 35 ms
- B. 352 ms
- C. 3.5 s
- D. 70.5 ms
- Correct Answer
- 352 ms
- 1. A capacitor of 0.02 µF is larger than
Options- A. 0.000020 F
- B. 200,000 pF
- C. 2,000 pF
- D. all of the above Discuss
- 2. Four resistors are connected in parallel. Fifteen mA flows through resistor R. If the second resistor is 2R, the third resistor 3R, and the fourth resistor 4R, the total current in the circuit is
Options- A. 60 mA
- B. 15 mA
- C. 135 mA
- D. 31.25 mA Discuss
- 3. Five resistors are connected in a series and there is a current of 3 A into the first resistor. The amount of current into the second resistor is
Options- A. 3 A
- B. 1 A
- C. 4 A
- D. 0.3 A Discuss
- 4. The total current divides among parallel resistors in a manner directly proportional to the resistance values.
Options- A. True
- B. False Discuss
- 5. The superposition theorem is useful for circuit analysis only in ac circuits.
Options- A. True
- B. False Discuss
- 6. In a balanced three-phase load, each phase has
Options- A. an equal amount of power
- B. one-third of total power
- C. two-thirds of total power
- D. a power consumption equal to
IL
Discuss
- 7. A capacitor with 150 Ω of capacitive reactance is across an ac source. The impedance, expressed in polar form, is
Options- A. Z = 150
- B. Z = 150∠90°Ω
- C. Z = 150 ∠?90°Ω
- D. Z = 150∠180°Ω Discuss
- 8. In assigning the direction of branch currents,
Options- A. the directions are critical
- B. the directions are not critical
- C. they must point into a node
- D. they must point out of a node Discuss
- 9. A square wave has a period of 60 µs. The first odd harmonic is
Options- A. 5 kHz
- B. 50 kHz
- C. 500 kHz
- D. 33.33 kHz Discuss
- 10. A resistor and a capacitor are in series across a 20 V ac source. Circuit impedance is 4.33 kΩ. Current flow in the circuit is
Options- A. 9.2 mA
- B. 92 mA
- C. 4.6 mA
- D. 460 mA Discuss
More questions
Correct Answer: 2,000 pF
Correct Answer: 31.25 mA
Correct Answer: 3 A
Correct Answer: False
Correct Answer: False
Correct Answer: an equal amount of power
Correct Answer: Z = 150 ∠?90°Ω
Correct Answer: the directions are not critical
Correct Answer: 50 kHz
Correct Answer: 4.6 mA
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