Discussion
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- Question
The winding resistance of a coil can be increased by
Options- A. increasing the number of turns
- B. using a thinner wire
- C. changing the core material
- D. increasing the number of turns or using thinner wire
- Correct Answer
- increasing the number of turns or using thinner wire
- 1. A 12 V source has an internal resistance of 90 Ω. If a load resistance of 20 Ω is connected to the voltage source, the load power, PL, is
Options- A. 2.38 mW
- B. 2.38 W
- C. 238 mW
- D. 23.8 W Discuss
- 2. Five 100 Ω resistors are connected in parallel. If one resistor is removed, the total resistance is
Options- A. 25 Ω
- B. 500 Ω
- C. 100 Ω
- D. 20 Ω Discuss
- 3. The impedance of a series RC circuit varies directly with frequency.
Options- A. True
- B. False Discuss
- 4. Two equal-value resistors in series will divide the source voltage equally.
Options- A. True
- B. False Discuss
- 5. XL is directly proportional to frequency and inductance.
Options- A. True
- B. False Discuss
- 6. 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
- 7. 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
- 8. A center tap (CT) is a connection at the midpoint of the secondary winding of a transformer.
Options- A. True
- B. False Discuss
- 9. 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
- 10. 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
More questions
Correct Answer: 238 mW
Correct Answer: 25 Ω
Explanation:
1/R = 1/R1 + 1/R2 + 1/R3 + 1/R4 1/R = 1/100 + 1/100 + 100 + 1/100 1/R = 4/100 1/R = 1/25 Therefore R = 25 ohm.
Correct Answer: False
Correct Answer: True
Correct Answer: True
Correct Answer: fourth quadrant
Correct Answer: 13 Ω
Correct Answer: True
Correct Answer: 500 V
Correct Answer: zero
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