As you want I am here giving you model question paper of communication specialization for BSNL TTA recruitment exam.

BSNL TTA communication specialization paper:

(1) The most common modulation system used for telegraphy is
(a) FSK
(b) PSK.
(c) PCM
(d) single tone modulation
(e) Two tone modulation

(2)VSB is an abbreviation of vestigal sideband, is derived by filtering
(a) DSB
(b) AM
(c) either (a) or (b)
(d) PM

(3) The Hartely law states that
(a) The maximum rate of information transmission depends on the depth of modulation
(b) The maximum rate of information depends on the channel bandwidth.
(c) Only binary codes may be used
(d) Redundancy is essential

(4) The FM signal with, a modulation index mf is passed through a frequency tripler. The wave in
the output of the tripler will have a modulation index of
(a) mf/9
(b) mf/3
(c) mf
(d) 3 mf
(e) 9mf

(5) In high power AM transmission, modulation is done at
(a) Buffer stage
(b) Oscillator stage
(c) RF power stage
(d) If stage

(6) Companding is used
(a) In delta modulator to combat noise
(b) To limit amplitude in PCM transmitters.
(c) In PWM for working it with TDM
(d) To protect small signals in PCM from quantizing distortion
(e) In PCM to reduce the SNR

(7) In PCM system the SNR of the output signal increases
(a) Inversely with bandwidth
(b) Exponential with bandwidth
(c) With rate of sampling
(d) At low frequencies only

(8) Armstrong modulator generates
(a) Phase modulated signal
(b) Frequency modulated signal
(c) Both of these
(d) Pulse code modulated signal
(e) AM and PCM signals

(9) A Klystron is a cavity acting as buncher and catcher is used as microwave tube for
(a) Guiding waves
(b) Velocity modulation
(c) frequency modulation
(d) impedance matching
(e) All of these

(10) Easily adjustable tuning component in a waveguide is
(a) plunger
(b) plunger and stub
(c) screw
(d) both (a) and (c)
(e) both (b) and (c)

(11) A ferrite is
(a) A non-conductor with magnetic properties
(b) A conductor with magnetic properties
(c) A semiconductors
(d) An insulator which attenuates magnetic fields
(e) A compound with good conductivity.




Here is the attachment.

Attached Files

BSNL TTA Communication Specialization Paper.pdf (82.4 KB, 71 views)