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Electromagnetic Field Theory Online Exam Quiz

Important questions about Electromagnetic Field Theory. Electromagnetic Field Theory MCQ questions with answers. Electromagnetic Field Theory exam questions and answers for students and interviews.

3. Characteristic impedance of a transmission line is 50 ?. Input impedance of the open circuited line. Z oc = 100 + J150 ?. When transmission line is short circuited, then value of the input impedance will be

Options

A : 50 ?

B : 100 + J150 ?

C : 7.69 + J11.54?

D : 7.69 - J11.54 ?

4. The input impedance of short-circuited line of length l where ?/4 < l < ?/2, is

Options

A : resistive

B : inductive

C : capacitive

D : none of the above

Options

A : 100 ?

B : 40 ?

C : 10000 ?

D : 4 ?

Options

A : 1.36 MHz

B : 13.6 MHz

C : 136 MHz

D : 1360 MHz

7. A wave is propagated in a waveguide at frequency of 9 GHz and separation is 2 cm between walls calculate the phase velocity for dominant mode.

Options

A : 3 x 10 8 m/sec

B : 5 x 10 8 m/sec

C : 1.5 x 10 8 m/sec

D : 9 x 10 8 m/sec

8. A plane wave is characterized by the wave is

Options

A : linearly polarized

B : circularly polarized

C : elliptically polarized

D : unpolarized

Options

A : 547.7 ?

B : 54.7 ?

C : 5.47 ?

D : .547 ?

Options

A : 2

B : - 2

C : 4

D : - 4

2. The velocity of electromagnetic wave in a good conductor is

Options

A : 3 x 10 8 m/s

B : more than 3 x 10 8 m/s

C : very low

D : high

Options

A : 0°

B : 30°

C : 45°

D : 60°

Options

Options

A : 6.25 cm

B : 12.50 cm

C : 50 cm

D : 100 cm

8. The divergence of the electric field intensity at any point equals

Options

A : 1/4 p ? 0 times the volume charge density

B : l/? 0 times the volume charge density at that point

C : ? 0 times the volume charge density at that point

D : the volume charge density at that point

Options

A : 196 W

B : 73 W

C : 36.5 W

D : 18.25 W

Options

A : 2.5 GHz

B : 5 GHz

C : 10 GHz

D : 12.5 GHz

Options

A : 46

B : 23

C : 50

D : 100

Options

A : 4°

B : 2°

C : 10°

D : 15°

Options

A : 4 cm

B : 1 cm

C : 2 cm

D : 8 cm

5. A (75 - j 40) W load is connected to a co-axial line of z 0 = 75? at 6 MHz. The load matching on the line can be accomplished by connecting

Options

A : a short circuit stub at the load

B : an inductance at the load

C : a short circuit stub at a specific distance from the load

D : a capacitance at a specific distance from the load

7. The electric field on the surface of a perfect conductor is 2V/m. The conductor is immersed in water with ? = 80 ? 0 . The surface charge density on the conductor is ((? 0 = 10 -9 /36 p )F/m)

Options

A : 0 c/m 2

B : 2 c/m 2

C : 1.8 x 10 -11 c/m 2

D : 1.14 x 10 -9 c/m 2