1
GATE ECE 2001
MCQ (Single Correct Answer)
+2
-0.6
In a uniform linear array, four isotropic radiating elements are spaced $$\lambda /4$$ apart. The progressive phase shift between the elements required for forming the main beam at 60° off the end-fire is
A
$$ - \pi \,\,rad$$
B
$$ - \pi /2\,\,rad$$
C
$$ - \pi /4\,\,rad$$
D
$$ - \pi /8\,\,rad$$
2
GATE ECE 2001
MCQ (Single Correct Answer)
+2
-0.6
A medium wave radio transmitter operating at a wavelength of 492 m has a tower antenna of height 124m. What is the radiation resistance of the antenna?
A
25 $$\Omega $$
B
36.5 $$\Omega $$
C
50 $$\Omega $$
D
73 $$\Omega $$
3
GATE ECE 2000
MCQ (Single Correct Answer)
+2
-0.6
The half-power beam widths (HPBW) of an antenna in the two orthogonal planes are $${100^ \circ }$$ and $${60^ \circ }$$ respectively. The directivity of the antenna is approximately equal to
A
2 db
B
5 db
C
8 db
D
12 db
4
GATE ECE 2000
MCQ (Single Correct Answer)
+2
-0.6
For an 8 feet (2.4 m) parabolic disk antenna operating at 4 GHz, the minimum distance required for far field measurement is closest to
A
7.5 cm
B
15 cm
C
15 m
D
150 m
GATE ECE Subjects
EXAM MAP
Medical
NEET
Graduate Aptitude Test in Engineering
GATE CSEGATE ECEGATE EEGATE MEGATE CEGATE PIGATE IN
CBSE
Class 12