Electronics-Inductors Question and Answer
Electronics-Inductors Question and Answer
41. With 100 Vac applied to the primary of a transformer so that it draws 500 mA, what will be the 300 Vac secondary current?
- 1500 mA
- 200 mA
- 167 mA
- 150 mA
42. Which coil would be used as a step-up transformer primary if coil number 1 has 100 more turns than coil number 2?
- The coil windings must be the same.
- coil 1
- The coil ratio is too small.
- coil 2
43. When the transformer secondary is not loaded:
- secondary voltage increases
- no secondary current flows
- no secondary voltage is present
- secondary current increases
44. What is the total inductance of a 5 H and a 100 mH coil connected in parallel?
- 4.76 mH
- 33.3 mH
- 98.0 mH
- 150.0 mH
45. A transformer is used:
- to couple electric energy from one dc circuit to another
- to couple electric energy from an ac circuit to a dc circuit
- to couple electric energy from a dc circuit to an ac circuit
- to couple electric energy from one ac circuit to another
46. Which of the following is NOT one of the three major types of fixed inductor?
- air core
- ferrite core
- magnesium core
- iron core
47. What is the impedance of a 1 kHz series RL circuit when R and XL are both 1000 ohms?
- 500 ohms
- 1000 ohms
- 1414 ohms
- 2000 ohms
49. You could decrease the time constant of an RL circuit by
- adding a resistor in parallel with the circuit resistance
- adding an inductor in series with the circuit inductance
- decreasing the amplitude of the input voltage
- exchanging the position of the resistor and inductor in the circuit
50. Indication of transformer primary and secondary voltage relationships is accomplished by:
- color-coded wires
- dot notation
- black, rather than gray, casings
- winding ratios