Electronics - Inductors

Exercise :: Inductors - General Questions

43. 

A practical inductor

A. has inductance
B. has winding resistance
C. has winding capacitance
D. all of the above

Answer: Option D

Explanation:

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44. 

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

Explanation:

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45. 

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

Explanation:

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46. 

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

Explanation:

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47. 

What is the inductive reactance?

mcq8_1033_1.gif

A. 5.2 omega.gif
B. 7.5 omega.gif
C. 1.3 komega.gif
D. 7.5 komega.gif

Answer: Option D

Explanation:

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48. 

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

Explanation:

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49. 

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

Explanation:

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