The phase angle corresponding to ?/4 in a standing-wave pattern is 30� 90� 135�

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Question
The phase angle corresponding to ?/4 in a standing-wave pattern is
Options
A. 30�
B. 90�
C. 135�
D. 180�

Correct Answer

90�

Explanation

The phase angle corresponding to ?/4 in a standing-wave pattern is 30� 90� 135� 180�

Electromagnetic Field Theory problems

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1. 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^-9/36p)F/m)
Options
A. 0 c/m²
B. 2 c/m²
C. 1.8 x 10^-11 c/m²
D. 1.14 x 10^-9 c/m²

2. The electric field of the incident wave is , where ? = 3 x 10⁹p and ? = 10 p. The electric field of the transmitted wave E_t is given by
Options
A.
B.
C.
D.

3. A (75 - j 40) W load is connected to a co-axial line of z₀ = 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

4. A wave is propagated in a waveguide at frequency of 9 GHz and separation is 2 cm between walls find cut off wavelength for dominant mode.
Options
A. 4 cm
B. 1 cm
C. 2 cm
D. 8 cm

5. A broadside array consisting of 200 cm wavelength with 10 half-wave dipole spacing 10 cm. And if each array element feeding with 1 amp. current and operating at same frequency then find the half power beamwidth
Options
A. 4�
B. 2�
C. 10�
D. 15�

6. Which one of the following potential does not satisfy Laplace's equations?
Options
A. v = 10 xy
B. v = p cos ?
C.
D. v = f cos ? + 10

7. Most antenna consisting of a 50 meter long vertical conductor operates over a perfectly conducting ground plane. It is base fed at a frequency of 600 kHz. The radiation resistance of the antenna in ohms is
Options
A.
B.
C.
D. 20p²

8. Consider a loss less antenna with a directive gain of + 6 dB. If 1 mW of power is fed to it the total power radiated by the antenna will be
Options
A. 4 mW
B. 1 mW
C. 7 mW
D. 1/4 mW

10. A transmission line is feeding 1 watt of power to a horn antenna having a gain of 10 dB. The antenna is matched to the transmission line. The total power radiated by the horn antenna into the free space is
Options
A. 10 watts
B. 1 watt
C. 0.1 watt
D. 0.01 watt

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