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- Question
XC is inversely proportional to frequency and capacitance.
Options- A. True
- B. False
- Correct Answer
- True
- 1. 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
- 2. 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
- 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. 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
- 5. Four amperes of current are measured through a 24 Ω resistor connected across a voltage source. How much voltage does the source produce?
Options- A. 960 V
- B. 9.6 V
- C. 96 V
- D. 8 V Discuss
- 6. 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
- 7. A Wheatstone bridge consists of four resistors in parallel.
Options- A. True
- B. False Discuss
- 8. A resistor normally opens when it burns out.
Options- A. True
- B. False Discuss
- 9. The branch current method is based on Kirchhoff's voltage law and Kirchhoff's current law.
Options- A. True
- B. False Discuss
- 10. The watt is the unit of power.
Options- A. True
- B. False Discuss
More questions
Correct Answer: Z = 150 ∠?90°Ω
Correct Answer: the directions are not critical
Correct Answer: 50 kHz
Correct Answer: 4.6 mA
Correct Answer: 96 V
Correct Answer: 18 mV
Correct Answer: False
Correct Answer: True
Correct Answer: True
Correct Answer: True
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Xc = 1/() so Xc is inversely propotional Capacitance