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Magnetism and Electromagnetism
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Question
There is 900 mA of current through a wire with 40 turns. What is the reluctance of the circuit if the flux is 400 µWb?
Options
A. 14,400 At/Wb
B. 1,440 At/Wb
C. 9,000 At/Wb
D. 90,000 At/Wb
Correct Answer
90,000 At/Wb
More questions
1. Find the node voltage
V
A
.
Options
A. 6 V
B. 12 V
C. 4.25 V
D. 3 V
Show Answer
Scratch Pad
Discuss
Correct Answer: 4.25 V
2. The Norton equivalent current is
Options
A. the current through the load
B. the open-current from the source
C. the short circuit current
D. none of the above
Show Answer
Scratch Pad
Discuss
Correct Answer: the short circuit current
3. In a certain parallel resonant band-pass filter, the resonant frequency is 14 kHz. If the bandwidth is 4 kHz, the lower frequency
Options
A. is 7 kHz
B. is 10 kHz
C. is 12 kHz
D. cannot be determined
Show Answer
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Discuss
Correct Answer: is 12 kHz
4. A signal with a 400 µs period has a frequency of
Options
A. 250 Hz
B. 2,500 Hz
C. 25,000 Hz
D. 400 Hz
Show Answer
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Discuss
Correct Answer: 2,500 Hz
5. The total power in a certain circuit is 12 W. Each of the four equal-value series resistors making up the circuit dissipates
Options
A. 12 W
B. 48 W
C. 3 W
D. 8 W
Show Answer
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Discuss
Correct Answer: 3 W
6. A three-phase generator is connected to three 90 Ω load resistors. Each coil generates 120 V ac. A common neutral line exists. How much current flows through the common neutral line?
Options
A. 0 A
B. 1.33 A
C. 3.99 A
D. 2.66 A
Show Answer
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Discuss
Correct Answer: 0 A
7. A balanced Wheatstone bridge consists of an
R
V
of 3,500 Ω, an
R
2
of 200 Ω, and an
R
3
of 680 Ω. The value of
R
UNK
is
Options
A. 680 Ω
B. 1,029 Ω
C. 200 Ω
D. 880 Ω
Show Answer
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Discuss
Correct Answer: 1,029 Ω
8. Electromagnetic induction is the force that produces a magnetic field.
Options
A. True
B. False
Show Answer
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Discuss
Correct Answer: False
9. How many primary volts must be applied to a transformer with a turns ratio of 0.1 to obtain a secondary voltage of 9 V?
Options
A. 9 V
B. 90 V
C. 900 V
D. 0.9 V
Show Answer
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Discuss
Correct Answer: 90 V
Explanation:
We know that, V2/V1 = N2/N1.
Given V2 = 9v, N2/N1 = 0.1
Therefore, 9v/V1 = 0.1
V1 = 9v/0.1 = 90v.
For more detail:
Step Down Transformer - Circuit with Simulation.
10. In the complex plane, the number 4 +
j
3 is located in the
Options
A. first quadrant
B. second quadrant
C. third quadrant
D. fourth quadrant
Show Answer
Scratch Pad
Discuss
Correct Answer: first quadrant
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Quantities and Units
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RLC Circuits and Resonance
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Three-Phase Systems in Power Applications
Time Response of Reactive Circuits
Transformers
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