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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

Que. 11

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. 12

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. 13

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. 14

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. 15

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. 16

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. 17

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. 18

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. 19

In H-plane metal plate lens antenna travelling wave fronts

A

totally retarded

B

retarded

C

accelerated

D

neither accelerated nor retarted

Que. 20

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