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Electrical Engineering - Magnetism and Electromagnetism

Exercise : Magnetism and Electromagnetism - General Questions
6.
What is the reluctance of a material that has a length of 0.07 m, a cross-sectional area of 0.014 m2, and a permeability of 4,500 Wb/At × m?
1111 At/Wb
111 At/Wb
11 At/Wb
1 At/Wb
Answer: Option
Explanation:
No answer description is available. Let's discuss.
7.
A coil of wire is placed in a changing magnetic field. If the number of turns in the coil is decreased, the voltage induced across the coil will
increase
decrease
remain constant
be excessive
Answer: Option
Explanation:
No answer description is available. Let's discuss.
8.
What is the flux density when the flux is 5.5 Wb and the cross-sectional area is 6 × 10–3 m2?
91.7 T
917 T
91 T
9.7 T
Answer: Option
Explanation:
No answer description is available. Let's discuss.
9.
The unit for reluctance is
tesla
At/Wb
At/m
Wb
Answer: Option
Explanation:
No answer description is available. Let's discuss.
10.
If the steel disk in a crankshaft position sensor has stopped with the tab in the magnet's air gap, the induced voltage
increases
decreases
is zero
will remain constant
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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