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Electromagnetic Field Theory

Electromagnetic Field Theory
A fan blade of length 2R rotates in a time period T in a magnetic field B. The induced voltage in the blade is proportional to

 R2B / T.
 2RBT.
 R2BT.
 RBT.

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Electromagnetic Field Theory
An inductor designed with 400 turns coil wound on an iron core of 16 cm2 cross sectional area and with a cut of air gap length of 1 mm. The coil is connected to a 230 V, 50 Hz supply. Neglected coil resistance, core loss, iron reluctance and leakage inductance. Find the current in the inductor.

 9.04 A.
 4.56 A.
 18.08 A.
 2.28 A.

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Electromagnetic Field Theory
Two coils are coupled in such a way that the mutual inductance between them is 20 mH. If the inductances of the coils are 40 mH and 50 mH respectively, the coefficient of coupling is

 0.01.
 0.447.
 0.577.
 0.477.

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Electromagnetic Field Theory
A satellite that simply reflect back the signals from one region of the earth to the other region is known as

Active satellite
Geostationary satellite
Passive satellite
Orbiting satellite

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Electromagnetic Field Theory
The virtual height of an ionospheric layer is __________ true height

Less than
No relation
Equal to
Higher than

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Electromagnetic Field Theory
Which of the following impedance inversion is obtained?

Balun transformer
A half wave line
A quarter wave line
Short-circuited stub

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