Discussion
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- Question
Electromagnetism is the:
Options- A. magnetic field caused by a permanent magnet
- B. action between a permanent and an artificial magnet
- C. magnetic field action with a current-carrying wire
- D. current in the coil
- Correct Answer
- magnetic field action with a current-carrying wire
- 1. When a magnet enters a coil and a voltage is induced, the process is known as:
Options- A. an alternation
- B. self-inductance
- C. counter emf
- D. flux linkage Discuss
- 2. A magnetic circuit breaker will open to protect equipment only when:
Options- A. voltage is exceeded
- B. an open is in the equipment
- C. the equipment is operating properly
- D. current is exceeded Discuss
- 3. You could decrease the time constant of an RL circuit by
Options- A. adding a resistor in parallel with the circuit resistance
- B. adding an inductor in series with the circuit inductance
- C. decreasing the amplitude of the input voltage
- D. exchanging the position of the resistor and inductor in the circuit Discuss
- 4. What is the inductive reactance if the Q of a coil is 60, and the winding resistance is 5 Ω?
Options- A. 0.083 Ω
- B. 12 Ω
- C. 30 Ω
- D. 300 Ω Discuss
- 5. Reactance in an inductive circuit will:
Options- A. increase with frequency
- B. decrease with frequency
- C. be independent from frequency
- D. depend on the value of XC Discuss
- 6. What is remanence?
Options- A. reactance
- B. reluctance
- C. retentitivity
- D. resistance Discuss
- 7. What is the inductive reactance?
Options- A. 5.2 Ω
- B. 7.5 Ω
- C. 1.3 kΩ
- D. 7.5 kΩ Discuss
- 8. Indication of transformer primary and secondary voltage relationships is accomplished by:
Options- A. color-coded wires
- B. dot notation
- C. black, rather than gray, casings
- D. winding ratios Discuss
- 9. When a transformer secondary lead has been connected to a middle loop that is not an end connector, it is called a:
Options- A. multiple-tapped secondary
- B. center-tapped secondary
- C. multiple winding secondary
- D. single winding secondary Discuss
- 10. Which coil would be used as a step-up transformer primary if coil number 1 has 100 more turns than coil number 2?
Options- A. The coil windings must be the same.
- B. coil 1
- C. The coil ratio is too small.
- D. coil 2 Discuss
Inductors problems
Search Results
Correct Answer: flux linkage
Correct Answer: current is exceeded
Correct Answer: adding an inductor in series with the circuit inductance
Correct Answer: 300 Ω
Correct Answer: increase with frequency
Correct Answer: retentitivity
Correct Answer: 7.5 kΩ
Correct Answer: dot notation
Correct Answer: center-tapped secondary
Correct Answer: coil 2
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