Inductors Questions and Answers

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Q41
With 100 Vac applied to the primary of a transformer so that it draws 500 mA, what will be the 300 Vac secondary current?
  • A 1500 mA
  • B 200 mA
  • C 167 mA
  • D 150 mA
Answer: Option C
Q42
Which coil would be used as a step-up transformer primary if coil number 1 has 100 more turns than coil number 2?
  • A The coil windings must be the same.
  • B coil 1
  • C The coil ratio is too small.
  • D coil 2
Answer: Option D
Q43
When the transformer secondary is not loaded:
  • A secondary voltage increases
  • B no secondary current flows
  • C no secondary voltage is present
  • D secondary current increases
Answer: Option B
Q44
What is the total inductance of a 5 H and a 100 mH coil connected in parallel?
  • A 4.76 mH
  • B 33.3 mH
  • C 98.0 mH
  • D 150.0 mH
Answer: Option C
Q45
A transformer is used:
  • A to couple electric energy from one dc circuit to another
  • B to couple electric energy from an ac circuit to a dc circuit
  • C to couple electric energy from a dc circuit to an ac circuit
  • D to couple electric energy from one ac circuit to another
Answer: Option D
Q46
Which of the following is NOT one of the three major types of fixed inductor?
  • A air core
  • B ferrite core
  • C magnesium core
  • D iron core
Answer: Option C
Q47
What is the impedance of a 1 kHz series RL circuit when R and XL are both 1000 ohms?
  • A 500 ohms
  • B 1000 ohms
  • C 1414 ohms
  • D 2000 ohms
Answer: Option C
Q48
What is remanence?
  • A reactance
  • B reluctance
  • C retentitivity
  • D resistance
Answer: Option C
Q49
You could decrease the time constant of an RL circuit by
  • 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
Answer: Option B
Q50
Indication of transformer primary and secondary voltage relationships is accomplished by:
  • A color-coded wires
  • B dot notation
  • C black, rather than gray, casings
  • D winding ratios
Answer: Option B

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