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- Question
A three-phase △-connected generator is driving a balanced load such that each phase current is 12 A in magnitude. When I ?a = 12 ∠30° A, what are the polar expressions for the other phase currents?
Options- A. I ?b = 12 ∠150° A, I ?c = 12∠?90° A
- B. I ?b = 12∠120° A, I ?c = 12∠30° A
- C. I ?b = 12∠30° A, I ?c = 12∠120° A
- D. I ?b = 12∠90° A, I ?c = 12∠90° A
- Correct Answer
- I ?b = 12 ∠150° A, I ?c = 12∠?90° A
- 1. What is the approximate resistance setting of a rheostat in which 650 mA of current flows with a 150 V source?
Options- A. 9.7 Ω
- B. 97 Ω
- C. 23 Ω
- D. 230 Ω Discuss
- 2. An 18 V source has an internal resistance of 70 Ω. If a load resistance of 33 Ω is connected to the voltage source, the load power, PL, is
Options- A. 0 W
- B. 1 W
- C. 175 mW
- D. 18 mW Discuss
- 3. In a series resonant band-pass filter, a lower value of Q results in
Options- A. a higher resonant frequency
- B. a smaller bandwidth
- C. a higher impedance
- D. a larger bandwidth Discuss
- 4. At the end of a 14 day period, your utility bill shows that you have used 18 kWh. What is your average daily power?
Options- A. 1.286 kWh
- B. 12.85 kWh
- C. 535 kWh
- D. 252 kWh Discuss
- 5. When the north poles of two bar magnets are brought close together, there will be
Options- A. no force
- B. a downward force
- C. a force of attraction
- D. a force of repulsion Discuss
- 6. When assigning branch currents, you need not be concerned with the direction you choose.
Options- A. True
- B. False Discuss
- 7. An 18 V power supply is connected across a coil with a winding resistance of 180 Ω. Current flow in the coil is
Options- A. 1 mA
- B. 10 mA
- C. 100 mA
- D. 1 A Discuss
- 8. An uncharged capacitor and a 1 kΩ resistor are connected in series with a switch and a 6 V battery. At the instant the switch is closed, the voltage across the capacitor is
Options- A. 6 V
- B. 3 V
- C. 2 V
- D. 0 V Discuss
- 9. When the resistor voltage in a series RL circuit becomes less than the inductor voltage, the phase angle
Options- A. increases
- B. decreases
- C. is not affected
- D. cannot be determined Discuss
- 10. A 10 µF, 20 µF, 22 µF, and 100 µF capacitor are in parallel. The total capacitance is
Options- A. 2.43 µF
- B. 4.86 µF
- C. 100 µF
- D. 152 µF Discuss
More questions
Correct Answer: 230 Ω
Correct Answer: 1 W
Correct Answer: a larger bandwidth
Correct Answer: 1.286 kWh
Correct Answer: a force of repulsion
Correct Answer: True
Correct Answer: 100 mA
Correct Answer: 0 V
Correct Answer: increases
Correct Answer: 152 µF
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