43.
A practical inductor
A. has inductance
B. has winding resistance
C. has winding capacitance
D. all of the above
Answer & Explanation
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 & Explanation
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 & Explanation
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 & Explanation
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 & Explanation
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 & Explanation
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 & Explanation
Answer: Option D
Explanation:
No answer description available for this question.