Bharat Sanchar Nigam Limited TTA exam previous year question papers free download

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(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.

(12) Vacuum tubes eventually fail at microwave frequencies because of their

(a) Inter electrode capacitance

(b) Small series inductance

(c) Large shunt capacitance

(d) Short transit time

(e) Increased noise figure

(13) The biggest disadvantage the IMP ATT diode has is its

(a) Low Efficiency

(b) high noise

(c) Low BW

(d) inability to provide pulse operation

(e) low power handling ability

(14) In AM transmission the frequency, which is not transmitted is

(a) carrier frequency

(b) audio frequency

(c) upper side frequency

(d) lower side frequency

(15) FM broadcast band lies in

(a) VHF

(b) UHF

(c) SHF

(d) HF

(16) Automatic gain control is used

(a) to maintain the tuning correct

(b) to reduce the voltage of loud passage of music

(c) to maintain the same amount of output, when stations of different strength are received

(d) to increase the amplification at high frequencies

(17) The modulation system inherently is most noise resistant in

(a) SSB suppressed carrier

(b) FM

(c) PPM

(d) PCM

(18) In practical waveguide act as

(a) low pass filter

(b) high pass filter

(c)band pass filter

(d)band stop filter

(19) The antenna efficiencies achieved in practice depend upon

(a) wave length

(b) impedance

(c) frequency

(d) none of above

(20) The process of compressing the digital codes at the transmitter and then expanding them back to their original form at receiver is known as

(a) Quantizing

(b) companding

(c) step sizing

(d) modulation

(21) Digital transmission efficiency is given by

(a) information bits/total bits

(b) total bits/information bits

(c) redundant bits/information bits

(d) none of the above

(22) The speed of BRI ISDN interface is

(a) 2B + D

(b) 2D + B

(c) 30B + D

(d) 30D + B

(23) Which of the following is not a microwave generation source?

(a) Klystron

(b) Magnetron

(c) TWT

(d) Diode

(24) A signal of maximum frequency of 1 KHz is sampled at Nyquist Rate. The interval between two successive samples is:

(a) 50 micro seconds

(b) 100 micro seconds

(c) 500 micro seconds

(d) 1000 micro seconds

(25) In order to get back the original signal, it is necessary to use:

(a) low pass filter

(b) high pass filter

(c) band pass filter

(d) band reject filter

(26) Man made noise id caused by:

(a) Solar eruptions

(b) Distant Stars

(c) Lightning Discharges

(d) Arc discharge in electric machines

(27) At microwave frequencies, the size of antenna becomes

(a) very large

(b) large

(c) small

(d) very small

(28) Due to curvature of earth, microwave repeaters are placed at distance of about

(a) l0 Km

(b) 50 Km

(c) 200 Km

(d) 500 Km

(29) For handling large microwave power, the best medium is

(a) coaxial line

(b) rectangular waveguide

(c) stripline

(d) circular wave guide

(30) An attenuator is used with TWT to

(a) prevent oscillations

(b) increase gain

(c) prevent saturation

(d) help bunching

(3l) TWT is basically

(a) an oscillator

(b) tuned amplifier

(c) wideband amplifier

(d) an audio amplifier

(32) The negative resistance in Gunn diode is due to

(a) electron transfer to a less mobile energy level

(b) high reverse bias

(c) electron domain formation at the junction

(d) tunneling across the junction

(33) Which of the following sinusoidal oscillator is preferred for microwave frequencies?

(a) resonant circuit oscillator

(b) RC phase shift oscillators

(c) negative resistance oscillators

(d) all of the above

(34) When electromagnetic waves are propagated in a waveguide

(a) they travel along the walls of the waveguide

(b) they travel through the dielectric without touching the walls

(c) they are reflected from the walls but do not travel along the walls

(d) none of above

(35) Wave guides are generally made of

(a) Cast iron or steel

(b) White metal or gun metal

(c) bronze or aluminium

(d) plastic or bakelite

(36) The cut off frequency of a wave guide means

(a) lower frequencies will not be propagated

(b) it determines the dimensions of the wave guide

(c) frequency at which zero transmission takes place

(d) None of above

(37) In case of matched load

(a) Transmission is zero

(b) reflection is zero

(c) reflection is unity

(d) transmission is equivalent to reflection

(38) In an AM wave with 100% modulation, the carrier is suppressed. The percentage of power saving will be

(a) 100%

(b) 50%

(c) 25%

(d) 66.7%

(39) The function of AM detector circuit is

(a) to rectify the input signal

(b) to discard the carrier

(c) to provide the audio signal

(d) All of the above

(40) In FM, the noise can be further decreased by

(a) decreasing deviation

(b) increasuig deviation

(c) keeping deviation constant

(d) none of these

(41) In PPM, message resides in

(a) Pulses

(b) time location of pulse edges

(c) none of these

(42) Which of the following pulse systems is preferred for communication in presence of noise?

(a) PAM

(b) PDM

(c) PPM

(d) none of above

(43) Which of the following pulse systems requires higher bandwidth

(a) PAM

(b)PDM

(c)PPM

(d)none of these

(44) The audio frequency range lies between

(a) 20 to 20,000 Hz

(b) 20 to 20,000 KHz

(c) 400 to 8,000Hz

(d) 500 to 5,000 Hz

(45) Maximum undistorted power output of a transmitter is obtained when its modulation is:

(a) more than 100%

(b) 100%

(c) less than 100%

(d) 50%

(46) The AGC voltage in a radio receiver is proportional to

(a) the amount of modulation

(b) the amplitude of audio signal

(c) the amplitude of IF carrier

(d) none of these

(47) An FM transmitter has maximum frequency deviation of 75 KHz and reproduces audio signal up to 15 KHz. Minimum channel width required, in KHz is

(a) 180

(b) 120

(c) 90

(d) 60

(48) With 100% modulation, ratio of side band power to total power transmitted in an amplitude modulated wave is

(a) 2/3

(b) l/3

(c) l/2

(d) l/4

(49) To increase the Q factor of an induction, it wound with

(a) thicker wire

(b) thinner wire

(c) longer wire

(d) wire with heavy insulation

(50) Power factor of a purely resistive circuit is:

(a) zero

(b) one

(c) 0.5

(d) infinity

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I wanted to prepare for the Examination of TTA ? for this Examination I wanted to get the question paper of the Instrument and Management of TTA?

As per your question here I am providing you the question paper of Instrumental and Management of TTA.

(1) Instrument is a device for determining
(a) the magnitude of a quantity
(b) the physics of a variable
(c) either of the above
(d) both (a) and (b)
(2) Electronic instruments are preferred because they have
(a) no indicating part
(b) low resistance in parallel circuit
(c) very fast response
(d) high resistance in series circuit
(e) no passive elements.
(3) A DC wattmeter essentially consist of
(a) two ammeters
(b) two voltmeters
(c) a voltmeter and an ammeter
(d) a current and potential transformer
(4) Decibel is a unit of
(a) power
(b) impedance
(c) frequency
(d) power ratio
(5) A dc voltmeter may be used directly to measure
(a) frequency
(b) polarity
(c) power factor
(d)power
(6) An accurate voltmeter must have an internal impedance of
(a) very low value
(b) low value
(c) medium value
(d) very high value
(7) The insulation resistance of a transformer winding can be easily measured with
(a) Wheatstone bridge
(b) megger
(c) Kelvin bridge
(d) voltmeter
(8) A 100 V voltmeter has full-scale accuracy of 5%. At its reading of 50 V it will give an error of
(a) 10%
(b) 5%
(c) 2.5%
(d) 1.25%
(9) You are required to check the p. f. of an electric load. No p.f. meter is available. You would
use:
(a) a wattmeter
(b) a ammeter, a voltmeter and a wattmeter
(c) a voltmeter and a ammeter
(d) a kWh meter
(10) The resistance of a field coil may be correctly measured by using
(a) a voltmeter and an ammeter
(b) Schering bridge
(c) a Kelvin double bridge
(d) a Maxwell bridge
(11) An analog instrument has output
(a) Pulsating in nature
(b) Sinusoidal in nature
(c) Which is continuous function of time and bears a constant relation to its input
(d) Independent of the input quantity
(12) Basic charge measuring instrument is
(a) Duddel's oscillograph
(b) Cathode ray oscillograph
(c) Vibration Galvanometer
(d) Bailastic Galvanometer
(e) Battery Charging equipment
(13) A.C. voltage can be measured (using a d.c. instrument) as a value obtained
(a) by subtracting the d.c. reading from it's a.c. reading.
(b) Using the output function of the multimeter
(c) By using a suitable inductor in series with it
(d) By using a parallel capacitor with it
(e) None of the above
(14) A moving coil permanent magnet ammeter can be used to measure
(a) D. C. current only
(b) A. C. current only
(c) A. C. and D. C. currents
(d) voltage by incorporating a shunt resistance
(e) none of these
(15) Select the wrong statement
(a) the internal resistance of the voltmeter must be high
(b) the internal resistance of ammeter must be low
(c) the poor overload capacity is the main disadvantage of hot wires instrument
(d) the check continuity with multimeter, the highest range should be used.
(e) In moving iron voltmeter, frequency compensation is achieved by connecting a capacitor across its
fixed coil.
(16) Which of the following instrument is suitable for measuring both a.c. and d.c.
quantities.
(a) permanent magnet moving coil ammeter.
(b) Induction type ammeter.
(c) Quadrant electrometer.
(d) Moving iron repulsion type ammeter.
(e) Moving iron attraction type voltmeter.
(17) Swamping resistance is used in moving coil instruments to reduce error due to
(a) thermal EMF
(b) temperature
(c) power taken by the instrument
(d) galvanometer sensitivity.
(18) A power factor meter is based on the principle of
(a) electrostatic instrument
(b) Electrodynamometer instrument(c) Electro thermo type instrument
(d) Rectifier type instrument.
(19) A potentiometer recorder is used for
(a) AC singles
(b) DC signals
(c) both (a) and (b)
(d) time varying signals
(e) none of these.
(20) Transformers used in conjunction with measuring instruments for measuring purposes are
called
(a) Measuring transformers
(b) transformer meters
(c) power transformers
(d) instrument transformers
(e) pulse transformers.
(21) Leakage flux in an electrical machine is measure by
(a) Ballistic galvanometer
(b) Flux meter
(c) Either (a) or (b)
(d) Vibration galvanometer
(e) CRO
(22) A C.R.O. is used to indicate
(a) supply waveform
(b) magnitude of the applied voltage
(c) B.H. loop
(d) all of these
(e) Magnitude of the current flowing in it.
(23) An oscillator is a
(a) an amplifier having feedback network
(b) a high gain amplifier
(c) a wide band amplifier
(d) a untuned amplifier
(e) None of these
(24) Distortion can be measured by
(a) Wave meter
(b) Digital filters
(c) Wein bridge circuit
(d) Bridge T filter circuit
(25) Series connected Q- meter is preferable for measurement of components having
(a) high impedance
(b) low impedance
(c) both (a) and (b)
(d) high frequency
(e) low capacitance
(26) A potentiometer is
(a) an active transducer
(b) a passive transducer
(c) a secondary transducer
(d) a digital transducer
(e) a current sensing transducer
(27) The basic components of a digital voltmeter are:
(a) A/D converter and a counter
(b) A/D converted and a rectifier
(c) D/A converter and a counter
(d) Ramp generator and counter
(e) Comparator
(28) Which of the following electrical equipment cannot convert ac into dc
(a) diode
(b) converter
(c) transformer
(d) mercury arc rectifier
(29) Voltage measurement are often taken by using either a voltmeter or
(a) an ammeter
(b) an ohmmeter
(c) an oscillator
(d) a watt-meter
(30)The electric device which blocks DC but allows AC is called:
(a) capacitance
(b) inductor
(c) an oscilloscope
(d) a watt-meter
(31 ) The range of an ammeter can be extended by using a
(a) shunt in series
(b) shunt in parallel
(c) multiplier in series
(d) multiplier in parallel
(32)A device that changes one form of energy to another is called
(a) rheostat
(b) oscillator
(c) transducer
(d) varicap
(33) Aquadag is used in CRO to collect
(a) primary electron
(b) secondary electron
(c) both primary and secondary
(d) none of above
(34) A vertical amplifier for CRO can be designed for
(a) only a high gain
(b) only a broad bandwidth
(c) a constant gain time bandwidth product
(d)all of the above
(35) One of the following is active transducer
(a) Strain gauge
(b) Selsyn
(c) Photovoltic cell
(d) Photo emissive cell
(36) The dynamic characteristics of capacitive transducer are similar to those of
(a) low pass filter
(b) high pass filter
(c) band pass filter
(d) band stop filter
(37) Thermocouples are
(a) passive transducers
(b) active transducers
(c) both active and passive transducers
(d) output transducers
(38) The size of air cored transducers as compare to iron core counter part are
(a) bigger
(b) smaller
(c) same
(39) From the point of view of safety, the resistance of earthing electrode should be:
(a) low
(b) high
(c) medium
(d) the value of resistance of electrode does not effect the safety
(40) In CRT the focusing anode is located
(a) between pre accelerating and accelerating anodes
(b) after accelerating anodes
(c) before pre accelerating anodes
(d) none of above
(41) Which transducer converts heat energy into electrical energy
(a) I. V. D. T.
(b) thermocouple
(c) photoconductor
(d) none of the above
(42) Which of photoelectric transducer is used for production of electric energy by converting
solar energy
(a) photo emission cell
(b) photo diode
(c) photo transistor
(d) both (b) and (c)
(43) Which of the following instruments consumes maximum power during measurement?
(a) induction instruments
(b) hot wire instruments
(c) thermocouple instruments
(d) electrodynamometer instruments
(44) Which of the following meters has the best accurancy
(a) moving iron meter
(b) moving coil meter
(c) rectifier type meter
(d) thermocouple meter
(45) The function of the safety resistor in ohm meter is to
(a) limit the current in the coil
(b) increase the voltage drop across the coil
(c) increase the current in the coil
(d) protect the battery
(46) Which of the following instruments is free from hysteresis and eddy current losses?
(a) M.l. instrument
(b) electrostatic instrument
(c) electrodynamometer type instrument
(d)all of these
(47) The dielectric loss of a capacitance can be measured by
(a) Wien bridge
(b) Owen bridge
(c) Schering bridge
(d) Maxwell bridge
(48) Reed frequency meter is essentially a
(a) recording system
(b) deflection measuring system
(c) vibration measuring system
(d) oscillatory measuring system
(49) In measurements made using a Q meter, high impedance elements should preferably be
connected in
(a) star
(b) delta
(c) series
(d) parallel
(50) A digital voltmeter measures
(a) peak value
(b) peak-to-peak value
(c) rms value
(d) average value

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