Electromagnetic Field Theory - Study Mode

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[#256] Magnetic flux can be measured by:

(A) capacitive pick-up

(B) inductive pick-up

(C) resistive pick-up

(D) hall-effect pick-up

Correct Answer

(D) hall-effect pick-up

[#257] A theorem that relates surface integral with the volume integral is called

(A) Stoke's theorem

(B) Gauss-divergence theorem

(C) Carnot's theorem

(D) Maximum power transfer theorem

Correct Answer

(B) Gauss-divergence theorem

[#258] When a load resistance RL is connected to a lossless transmission line of characteristic impedance 75 Ω. It results in a VSWR of 2. The load resistance is

(A) 100 Ω

(B) 75 $$sqrt 2 $$ xa0Ω

(C) 120 Ω

(D) 150 Ω

Correct Answer

(D) 150 Ω

[#259] In a hundred-turn coil, if the flux through each turn is (t 3 - 2t) mWb, the magnitude of the induced emf in the coil at a time of 4s is:

(A) 46 mV

(B) 56 mV

(C) 4.6 V

(D) 5.6 V

Correct Answer

(C) 4.6 V

[#260] A uniform plane electromagnetic wave incident normally on a plane surface of a dielectric material is reflected with a VSWR of 3. What is the percentage of incident power that is reflected?

(A) 10%

(B) 25%

(C) 50%

(D) 75%

Correct Answer

(B) 25%