Que. 1 In telephones,the dial tone has a freq. of
A 1hz
B 13 hz
C 33 hz
D 133 hz
Que. 2 the transmitting antenna to be used for telivision broadcast is necessarily
A a parabolic reflector
B a high directive antenna
C an omnidirectional antenna
D none of these
Que. 3 A standard refrences antenna for directivity is
A element doublet
B half wave dipole
C isotropic antenna
D Rhombic antenna
Que.4 maximum voltage is induced in a loop antenna if it is placed
A parallel to the incoming wave
B all right angles to the incoming wave
C at 45degree to the incoming wave
D none of the above
Que. 5 the advantage of marconi antenna over the ungrounded antenna is that
A only one fourth of the height is required as compared ungrounded
antenna
B one half of the height is required as compared ungrounded antenna
C no capacitance is required
D none of the above
Que. 6 The antenna best guided by a wave guide
A biconical
B horn
C helical
D discone
Que. 7 Night effect is most prominent in
A Adcock antenna
B vertical antenna
C loop antenna
D all of these
Que. 8 UHF and microwaves in the freq. range 300mHz to 30 Ghz can be best transmitted
using
A sky wave propagation
B ground wave propagation
C duct propagation
D none of these propagation
Que. 9 In a medium if e.u and 0- are constant through out the medium then it
is known as
A perfect medium
B distributed medium
C homogeneous medium
D dielectric medium
Que. 10 When an electromagnetic wave travelling in one medium strikes upon a secound
medium the wave will be
A totally transmitted
B totally reflected
C neither transmitted nor reflected
D partially transmitted and partially reflected
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