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- Question
When an additional resistor is connected across an existing parallel circuit, the total resistance
Options- A. remains the same
- B. decreases by the value of the added resistor
- C. increases by the value of the added resistor
- D. decreases
- Correct Answer
- decreases
- 1. A transformer has a 1:6 turns ratio and a secondary coil load resistance of 470 Ω. The load resistance as seen by the source is
Options- A. 1.3 Ω
- B. 7.8 Ω
- C. 78 Ω
- D. 13 Ω Discuss
- 2. A center tap (CT) is a connection at the midpoint of the secondary winding of a transformer.
Options- A. True
- B. False Discuss
- 3. How much voltage is needed to produce 2.5 A of current through a 200 Ω resistor?
Options- A. 50 V
- B. 500 V
- C. 80 V
- D. 8 V Discuss
- 4. In a three-phase system, when the loads are perfectly balanced, the neutral current is
Options- A. zero
- B. one-third of maximum
- C. two-thirds of maximum
- D. at maximum Discuss
- 5. 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
- 6. The reactive voltages, VL and VC, cancel at resonance.
Options- A. True
- B. False Discuss
- 7. Find the node voltage VA.
Options- A. 6 V
- B. 12 V
- C. 4.25 V
- D. 3 V Discuss
- 8. 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
- 9. 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
- 10. 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
More questions
Correct Answer: 13 Ω
Correct Answer: True
Correct Answer: 500 V
Correct Answer: zero
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
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