Discussion
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- Question
The complex number 40∠ 55° is equivalent to
Options- A. 55 + j55
- B. 40 + j40
- C. 45.88 + j65.52
- D. 22.94 + j32.76
- Correct Answer
- 22.94 + j32.76
- 1. In the complex plane, the number 14 ? j5 is located in the
Options- A. first quadrant
- B. second quadrant
- C. third quadrant
- D. fourth quadrant Discuss
- 2. A 47 Ω resistor and a capacitor with 150 Ω of capacitive reactance are in series across an ac source. The impedance, expressed in rectangular form, is
Options- A. Z = 47 Ω + j150 Ω
- B. Z = 47 Ω ? j150 Ω
- C. Z = 197 Ω
- D. Z = 103 Ω Discuss
- 3. An ohmmeter is connected across an inductor and the pointer indicates zero ohms. The inductor is
Options- A. good
- B. open
- C. shorted
- D. partly shorted Discuss
- 4. An inductance of 0.08 µH is larger than
Options- A. 0.0000008 H
- B. 0.000000008 H
- C. 0.000008 H
- D. 0.00008 mH Discuss
- 5. The current through a 120 mH coil is changing at a rate of 150 mA/s. The voltage induced across the coil is
Options- A. 1.8 mV
- B. 18 mV
- C. 180 mV
- D. 1.25 mV Discuss
- 6. The complex number 6 + j6 is equivalent to
Options- A. 6∠45°
- B. 36∠45°
- C. 8.48∠45°
- D. 8.48∠90° Discuss
- 7. A 47 Ω resistor and a capacitor with a capacitive reactance of 120 Ω are in series across an ac source. What is the circuit impedance, Z?
Options- A. 129 Ω
- B. 12.9 Ω
- C. 167 Ω
- D. 73 Ω Discuss
- 8. For a certain load, the true power is 150 W and the reactive power is 125 VAR. The apparent power is
Options- A. 19.52 W
- B. 195.2 W
- C. 275 W
- D. 25 W Discuss
- 9. A 6 kHz sinusoidal voltage is applied to a series RC circuit. The frequency of the voltage across the resistor is
Options- A. 0 Hz
- B. 12 kHz
- C. 6 kHz
- D. 18 kHz Discuss
- 10. What is the angular difference between +j4 and ?j4?
Options- A. 30°
- B. 90°
- C. 180°
- D. 270° Discuss
RC Circuits problems
Search Results
Correct Answer: fourth quadrant
Correct Answer: Z = 47 Ω ? j150 Ω
Correct Answer: shorted
Correct Answer: 0.000000008 H
Correct Answer: 18 mV
Correct Answer: 8.48∠45°
Correct Answer: 129 Ω
Correct Answer: 195.2 W
Correct Answer: 6 kHz
Correct Answer: 180°
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