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Electromagnetic-theory Questions Set 91:

Quiz Mode

If FNBW (first null beam width) is 6°, then resolution is

6^o

3^o

13^o

12^o

Solution:

What is the overall efficiency of a lossless antenna with reflection coefficient 0.15?

0.977

0.77

0.779

0.877

Solution:

Calculate the wavelength of a line with a phase constant of 11.685 units.

1.86 units

0.54 units

1.08 units

0.78 units

Solution:

Find the effective length of a receiving antenna with open circuit voltage 1V and incident electric field 200mV/m?

15m

10m

Solution:

The radiation efficiency for antenna having radiation resistance 36.15Ω and loss resistance 0.85Ω is given by

0.77

0.977

0.779

0.877

Solution:

When two vectors are perpendicular, their

a) Dot product is zero

b) Cross product is zero

c) Both are zero

d) Both are not necessarily zero

Solution:

Find the power radiated by an antenna whose radiation resistance is 100Ω and operating with 3A of current at 2GHz frequency?

600Watts

700Watts

800Watts

900Watts

Solution:

What kind of network is that in which the R, L, C parameters are individually concentrated or lumped at discrete points in the circuit are called

Lumped

Distributed

Parallel

Paired

Solution:

The magnitudes of the open – circuit and short – circuit input impedances of a transmission line are 506 Ω and 205 Ω respectively. The characteristic impedance of the line is approximately equal to

345

322

339

341

Solution:

A conducting semi-circular loop of radius R = 0.1 m, with its diameter centered at the origin, rotates in the x-y plane about the origin with a constant angular velocity, w = 20 rad/s, as shown. A magnetic field of magnitude B = 2 T and normal to x-y plane exists in the region ≥ 0 as shown. If the loop has a resistance of 2 0, and negligible inductance, the peak-to- peak current (in milliamperes) in the loop is (round off to one decimal place)

Electromagnetic-theory Questions Set 91:

If FNBW (first null beam width) is 6°, then resolution is

Solution:

What is the overall efficiency of a lossless antenna with reflection coefficient 0.15?

Solution:

Calculate the wavelength of a line with a phase constant of 11.685 units.

Solution:

Find the effective length of a receiving antenna with open circuit voltage 1V and incident electric field 200mV/m?

Solution:

The radiation efficiency for antenna having radiation resistance 36.15Ω and loss resistance 0.85Ω is given by

Solution:

When two vectors are perpendicular, their

Solution:

Find the power radiated by an antenna whose radiation resistance is 100Ω and operating with 3A of current at 2GHz frequency?

Solution:

What kind of network is that in which the R, L, C parameters are individually concentrated or lumped at discrete points in the circuit are called

Solution:

The magnitudes of the open – circuit and short – circuit input impedances of a transmission line are 506 Ω and 205 Ω respectively. The characteristic impedance of the line is approximately equal to

Solution:

Solution:

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