GATE (Graduate Aptitude Test in Engineering) Electronics: Questions 920 - 922 of 1076

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Question 920

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Appeared in Year: 2019

Question

Numeric Answer▾

Radiation resistance of a small dipole current element of length l at a frequency of 3 GHz is 3 ohms. If the length is changed by 1 % , then the percentage change in the radiation resistance, rounded off two decimal places, is … % . (Carry One Mark Each)

Question 921

Discrete-Time Fourier Transform (DTFT), DFT, FFT

Appeared in Year: 2017

Question

Numeric Answer▾

Let be the impulse response of a discrete-time linear time invariant (LTI) filter. The impulse response is given by

Let be the Discrete-Time Fourier transform (DTFT) of h [n] , where is the normalized angular frequency in radians. Given that and the value of (in radians) is equal to …

Question 922

Appeared in Year: 2016

Question

MCQ▾

The electric field of a uniform plane wave travelling along the negative z direction is given by the following equation:

This wave is incident upon a receiving antenna placed at the origin and whose radiated electric field towards the incident wave is given by the following equation:

The polarization of the incident wave, the polarization of the antenna and losses due to the polarization mismatch are, respectively,

Choices

Choice (4)Response

a.

Circular (clockwise) , Linear,

b.

Circular (anticlockwise) , Linear,

c.

Linear, Circular (clockwise) ,

d.

Circular (clockwise) , Linear,

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