Que. 1 Tropospheric scatter is used with freq. in
A HF
B VHF
C UHF
D VLF
Que. 2 Higher value of SWR signifies
A higher ohmic lossless
B higher ohmic lossless and possibility of insulation breakdown
C higher radiation resistance
D none of these
Que. 3 A transmission line quarter wave section is used to reject an interfering
freq. of 100mhz its approximate length is
A 3m
B 1.5m
C 75cm
D none of these
Que. 4 The quarter wave monopole at a freq. of 1mhz has a length of
A 1m
B 75m
C 150m
D 225m
Que. 5 medium wave radio signal may be received at for off distance at night
because
A radio wave travels faster at night
B ground wave attenuation is low at night
C the sky wave is stronger at night
D there is no fading at night
Que. 6 For a dipole antenna
A The radition intensity is maximum along the normal to the dipole axis
B The current distribution along its length is uniform ieeespective
of the length
C The effective length equals its physical length
D The input impedance is independent of the location of the feed point
Que. 7 The polarization of electromagnetic wave is
A the direction of electric and magnetic field
B the direction of electric field
C the direction of magnetic field
D none of above
Que. 8 Telex is a
A Telephone services between various subscriber
B Teleprinter services between various subscriber
C Television services between various subscriber
D Telegraph services between various subscriber
Que. 9 The purpose of peak clipper ckt in radio transmitter is to
A reduce bandwidth
B increase bandwidth
C prevent over modulation
D regulate oscillator input voltage
Que. 10 The current distribution of a half wave dipole is
A uniform
B sinusoidal
C triangular
D complex
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