GATE ECE 2004 | Antennas Question 17 | Electromagnetics

GATE ECE 2004

MCQ (Single Correct Answer)

-0.3

Consider a lossless antenna with a directive gain of + 6 dB. If 1 m W of power is fed to it the total power radiated by the antenna will be

4 m W

1 m W

7 m W

1/4 m W

GATE ECE 2002

MCQ (Single Correct Answer)

-0.3

The line-of-sight communication requires the transmit and receive antennas to face each other. If the transmit antenna is vertically polarized for best reception the receiver antenna should be

horizontally polarized

vertically polarized

at $${45^ \circ }$$ with respect to horizontal polarization

at $${45^ \circ }$$ with respect to vertical polarization

GATE ECE 2000

MCQ (Single Correct Answer)

-0.3

If the diameter of a $$\lambda /2$$ dipole antenna is increased from $$\lambda /100$$ to $$\lambda /50$$ then is

bandwidth increases

bandwidth decreases

gain increases

gain decreases

GATE ECE 1998

MCQ (Single Correct Answer)

-0.3

An antenna in free space receives 2$$\mu $$ W of power when the incident electric field is 20 m V/m rms. The effective aperture of the antenna is

0.005 $${m^2}$$

0.05 $${m^2}$$

1.885 $${m^2}$$

3.77 $${m^2}$$

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