Inductors Questions and Answers

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Q31
A turns ratio of 5 for a transformer implies:
  • A more primary turns than secondary turns
  • B more secondary current than primary current
  • C larger source impedance than load impedance
  • D more secondary turns than primary turns
Answer: Option D
Q32
A practical inductor
  • A has inductance
  • B has winding resistance
  • C has winding capacitance
  • D all of the above
Answer: Option D
Q33
When current in an inductor starts to change, it cannot react instantly due to:
  • A fixed coil resistance
  • B eddy current generation
  • C applied emf of the circuit
  • D the counter emf of the coil
Answer: Option D
Q34
What is the approximate time for a complete decay of 400 mA of inductor current, when R = 10 ohms and L = 20 H?
  • A 10 seconds
  • B 8 seconds
  • C 4 seconds
  • D 2 seconds
Answer: Option A
Q35
A utility pole transformer used to supply a residential customer with two phases uses:
  • A two phases on the primary
  • B a center tap on the secondary
  • C a separate ground for each phase
  • D a small coefficient of coupling
Answer: Option B
Q36
When a coil collapses the induced circuit current will:
  • A be in the same direction
  • B go to zero
  • C aid counter emf buildup
  • D be in the opposite direction
Answer: Option A
Q37
When a rate of one ampere per second causes an induced voltage of one volt, the unit of measure is
  • A a lenz
  • B an ohm
  • C a farad
  • D a henry
Answer: Option D
Q38
If you wanted to decrease the inductance of a coil, you might increase the:
  • A number of turns
  • B permeability of the core
  • C spacing between turns
  • D area of the coil
Answer: Option A
Q39
The output phase for a transformer is:
  • A in phase with the input
  • B out of phase with the input
  • C dependent on the direction of the primary and secondary windings
  • D dependent on the frequency of the primary source
Answer: Option C
Q40
Opposition to current flow without the dissipation of energy is called:
  • A resistance
  • B inductive reactance
  • C counter emf
  • D impedance
Answer: Option B

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