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- Question
A switch, a 220 Ω resistor, and a 60 mH inductor are in series across a 20 V battery. What is the current through the inductor two time constants after the switch is closed?
Options- A. 91 mA
- B. 78 mA
- C. 57 mA
- D. 400 mA
- Correct Answer
- 78 mA
- 1. In a △-connected source feeding a Y-connected load,
Options- A. each phase voltage equals the difference of the corresponding load voltages
- B. each phase voltage equals the corresponding load voltage
- C. each phase voltage is one-third the corresponding load voltage
- D. each phase voltage is 60° out of phase with the corresponding load voltage Discuss
- 2. The reactive voltages, VL and VC, cancel at resonance.
Options- A. True
- B. False Discuss
- 3. Find the node voltage VA.
Options- A. 6 V
- B. 12 V
- C. 4.25 V
- D. 3 V Discuss
- 4. The Norton equivalent current is
Options- A. the current through the load
- B. the open-current from the source
- C. the short circuit current
- D. none of the above Discuss
- 5. In a certain parallel resonant band-pass filter, the resonant frequency is 14 kHz. If the bandwidth is 4 kHz, the lower frequency
Options- A. is 7 kHz
- B. is 10 kHz
- C. is 12 kHz
- D. cannot be determined Discuss
- 6. A signal with a 400 µs period has a frequency of
Options- A. 250 Hz
- B. 2,500 Hz
- C. 25,000 Hz
- D. 400 Hz Discuss
- 7. The total power in a certain circuit is 12 W. Each of the four equal-value series resistors making up the circuit dissipates
Options- A. 12 W
- B. 48 W
- C. 3 W
- D. 8 W Discuss
- 8. A three-phase generator is connected to three 90 Ω load resistors. Each coil generates 120 V ac. A common neutral line exists. How much current flows through the common neutral line?
Options- A. 0 A
- B. 1.33 A
- C. 3.99 A
- D. 2.66 A Discuss
- 9. A balanced Wheatstone bridge consists of an RV of 3,500 Ω, an R2 of 200 Ω, and an R3 of 680 Ω. The value of RUNK is
Options- A. 680 Ω
- B. 1,029 Ω
- C. 200 Ω
- D. 880 Ω Discuss
- 10. Electromagnetic induction is the force that produces a magnetic field.
Options- A. True
- B. False Discuss
More questions
Correct Answer: each phase voltage equals the difference of the corresponding load voltages
Correct Answer: True
Correct Answer: 4.25 V
Correct Answer: the short circuit current
Correct Answer: is 12 kHz
Correct Answer: 2,500 Hz
Correct Answer: 3 W
Correct Answer: 0 A
Correct Answer: 1,029 Ω
Correct Answer: False
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