Discussion
Home ‣ Electrical Engineering ‣ Alternating Current and Voltage Comments
- Question
A sine wave with a period of 4 ms is changing at a faster rate than a sine wave with a period of
Options- A. 0.0045 s
- B. 2 ms
- C. 1.5 ms
- D. 3,000 µs
- Correct Answer
- 0.0045 s
- 1. A sine wave of 15 kHz is changing at a faster rate than a sine wave with a frequency of
Options- A. 25 kHz
- B. 12 kHz
- C. 18 kHz
- D. 1.3 MHz Discuss
- 2. The conductive loop on the rotor of a simple two-pole, single-phase generator rotates at a rate of 400 rps. The frequency of the induced output voltage is
Options- A. 40 Hz
- B. 100 Hz
- C. 400 Hz
- D. indeterminable Discuss
- 3. 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
- 4. One sine wave has a positive-going zero crossing at 15° and another sine wave has a positive-going zero crossing at 55°. The phase angle between the two waveforms is
Options- A. 0°
- B. 45°
- C. 40°
- D. none of the above Discuss
- 5. A sine wave with an rms value of 12 V is riding on a dc level of 18 V. The maximum value of the resulting waveform is
Options- A. 6 V
- B. 30 V
- C. 35 V
- D. 0 V Discuss
- 6. A sine wave voltage is applied across an inductor. When the frequency of the voltage is decreased, the current
Options- A. is increased
- B. is decreased
- C. does not change
- D. momentarily goes to zero Discuss
- 7. A 320 µH coil is in series with a 3.3 kΩ resistor. How long does it take for current to build up to its full value?
Options- A. 0.48 s
- B. 0.48 ms
- C. 0.48 µs
- D. 48 s Discuss
- 8. Two 10 H inductors are in parallel and the parallel combination is in series with a third 10 H inductor. What is the approximate total reactance when a voltage with a frequency of 7 kHz is applied across the circuit terminals?
Options- A. 219 kΩ
- B. 66 kΩ
- C. 660 kΩ
- D. 1.3 MΩ Discuss
- 9. The inductance of an iron-core coil decreases if
Options- A. the number of turns is decreased
- B. the iron core is removed
- C. the length of the coil decreases
- D. none of the above Discuss
- 10. Two inductors, L1 and L2, are in parallel. L1 has a value of 25 µH and L2 a value of 50 µH. The parallel combination is in series with L3, a 20 µH coil. The entire combination is across an ac source of 60 Vrms at 300 kHz. The total rms current is
Options- A. 87 mA
- B. 870 mA
- C. 87 A
- D. 337 mA Discuss
Alternating Current and Voltage problems
Search Results
Correct Answer: 12 kHz
Correct Answer: 400 Hz
Correct Answer: 50 kHz
Correct Answer: 40°
Correct Answer: 35 V
Correct Answer: is increased
Correct Answer: 0.48 µs
Correct Answer: 660 kΩ
Correct Answer: the number of turns is decreased
Correct Answer: 870 mA
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