1
GATE ECE 1997
MCQ (Single Correct Answer)
+2
-0.6
A parabolic dish antenna has a conical beam 20 wide. The directivity of the antenna is approximately
A
20 dB
B
30 dB
C
40 dB
D
50 dB
2
GATE ECE 1997
Subjective
+5
-0
A dipole antenna has a sin$$\theta $$ radiation pattern where the angle $$\theta $$ is measured from the axis of the dipole. The dipole is vertically located above an ideal ground plane (Fig.). What should be the height of the dipole H in terms of wave length so as to get a null in the radiation pattern at an angle of 450 from the ground plane? Find the direction of maximum radiation also. GATE ECE 1997 Electromagnetics - Antennas Question 18 English
3
GATE ECE 1997
MCQ (Single Correct Answer)
+1
-0.3
The units of $$\frac q{KT}$$ are
A
V
B
V-1
C
J
D
J/K
4
GATE ECE 1997
MCQ (Single Correct Answer)
+1
-0.3
The curve given by the equation $${x^2} + {y^2} = 3axy$$ is
A
Symmetrical about $$x$$-axis
B
Symmetrical about $$y$$-axis
C
Symmetrical about the line $$y=x$$
D
Tangential to $$x=y=a/3$$
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