Que. 31 The shortest stub length in (lemda) required to produce a reactance =
Z(0) is
A (lemda)
B (lemda)/8
C (lemda)/4
D 2*(lemda)
Que. 2 The signals contaminated with large noise are demodulated by
A envelope dector
B synchronous dector
C envelope dector followed by low pass filter
D envelope dector followed by high pass filter
Que. 3 The effect of ground on radiation pattern is
A to increas its wavelength
B to produce more number of nulls
C to cause cancellation of radiation alone the around
D both b and c above
Que. 4 the ground wave coverage of the medium wave transmitter is 100 km and
in the night the first reflected ray is at 800km the skip distance
is
A 900km
B 700km
C 100km
D 800km
Que. 5 Which of the following has the least wavelength
A X-Rays
B Ultra-violet
C infra-red
D UHF
Que. 6 The charecteristic impedance of a transmission line is
A directly proportional to it's length
B inversly proportional to it's length
C independent of its length
D non of these
Que. 7 Zoning is used with a dielectric anteena in order to
A permit pin point focusing
B reduce the bulk of the lens
C increase the band width of the lens
D correct the curvature of the wave front from the horn that is
too short
Que. 8 Cassegrain feed is used with a parabolic reflector to
A reduce the size of the main reflector
B increase the gain of the system
C increase the beam width of the system
D allow the feed to be placed at a convenient point
Que. 9 A prominent wave should have
A no phase shift
B no attenuation
C highest cutoff freq.
D lowest cutoff feq.
Que. 10 Circular polarization is said to occure if
A the magnitude of the two waves is the same
B the phase of the two waves is the same
C the magnitude is the same and the phase different is zero
D the magnitude is the same and the phase is
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