Que. 1 distance near the skip distance should be used for sky-wave propogation
A to avoide the faraday effect
B to avoide tilting
C To prevent sky-wave and upper ray interface
D so as to exceed the critical freq.
Que. 2 in air a lossless transmission line of length 50cm with L=10micro H/m,C=40pF/m
is operated at 25Mhz its electrical path length is
A 0.5meter
B lemda meters
C (pi)/2 radians
D 180 degree
Que. 3 A coil has an inductance of 1H. If a current changing @ 1A/secs
A induces 1v in another coil
B causes a back emf of1v
C causes a aiding emf of1v
D causes transformer action
Que. 4 A parabolic dish antenna with a effenciency of 55% and an operating freq.
of 10Ghz has a gain of 43.82dB.Its diameter is
A 1m
B 2m
C 4m
D 8m
Que. 5 Which of the following represents 'E3(16) '?
A (1 CE) + (A2)
16 16
B (1 BC) + (DE)
16 16
C (2 BC) - (1 DE)
16 16
D (200) - (11 D)
16 16
Que. 6 The charecteristic impedance of a transmission line with inductance 0.294
micro H/m.and capacitance 60 pF/m is
A 49 W
B 60 W
C 70 W
D 140 W
Que. 7 The circles on the Smith chart
A represents normalised constant resistance or conductance
B represents normalised constant reactance or susceptance
C are constant SWR circles
D are connected 'p'circles
Que. 8 In a parasitic array,
A Only one of the element is driven, the others get excitation
from the field produced
B all the elements of the array are the driven elements
C there are more than one directors
D there is one driven elemnts one director and one reflector
Que. 9 In H-plane metal plate lens antenna travelling wave fronts
A totally retarded
B retarded
C accelerated
D neither accelerated nor retarted
Que. 10 The type of antenna to be used for produceing circulary polarised beams
is
A pyramidal horn
B log-perodic array
C paraboloid
D helical antenna
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