Discussion
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- Question
A voltage is induced in a transformer secondary winding by the action of the:
Options- A. secondary magnetic field
- B. primary turns ratio
- C. primary magnetic field
- D. secondary counter emf
- Correct Answer
- primary magnetic field
- 1. What will happen when an inductor's magnetic field collapses?
Options- A. Current will double.
- B. Voltage will be induced.
- C. A new field will expand.
- D. Counter emf will be high. Discuss
- 2. When a coil collapses the induced circuit current will:
Options- A. be in the same direction
- B. go to zero
- C. aid counter emf buildup
- D. be in the opposite direction Discuss
- 3. When a load is not connected to the secondary of a transformer:
Options- A. primary current is zero
- B. primary current is inversely proportional to primary impedance
- C. secondary voltage is zero
- D. secondary voltage is proportional to primary impedance Discuss
- 4. With a square wave input, an RL differentiator circuit with an output across the inductor will produce what type of waveform?
Options- A. dc
- B. short time-duration pulses
- C. exponential-shaped pulses
- D. only a phase shift Discuss
- 5.
What is the total inductance in the given circuit?
Options- A. 160 mH
- B. 300 mH
- C. 900 mH
- D. 1700 mH Discuss
- 6. 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
- 7. 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
- 8. 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
- 9. 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
- 10. 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
Inductors problems
Search Results
Correct Answer: Voltage will be induced.
Correct Answer: be in the same direction
Correct Answer: primary current is inversely proportional to primary impedance
Correct Answer: short time-duration pulses
Correct Answer: 160 mH
Correct Answer: increase with frequency
Correct Answer: 300 Ω
Correct Answer: adding an inductor in series with the circuit inductance
Correct Answer: current is exceeded
Correct Answer: flux linkage
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