BSNL TTA (JE) COMMUNICATION 200 EXPECTED QUESTIONS

(WWW.ALLEXAMREVIEW.COM) PART THREE

ANSWER KEY-Correct answer is indicated by symbol (V) in options.
HINTS-In some questions options E-HINTS is indicating the hints of answer
1) The VLF, LF and MF antennas are
A [ ]) horizontally polarized
B [v]) vertically polarized
C [ ]) non linearly polarized
D [ ]) either (a) or (b)

2) If carrier is modulated by a digital bit stream having one of the possible phases of 0°,
90°, 180°, and 270°, then modulation is called
A [ ]) BPSK
B [v]) QPSK
C [ ]) QAM
D [ ]) MSK

3) Johnson noise
A [v]) white for all Practical application
B [ ]) always white
C [ ]) depends on temperature
D [ ]) never white

4) The number of repeaters in a coaxial cable link depends on

A [v]) system bandwidth
B [ ]) separation of equalizers
C [ ]) the number of coaxial cables in the tube
D [ ]) none of the above

5) The overall noise temperature Te, absolute temperature T and noise figure F are related
as
A [v]) Te = T(F - 1)
B [ ]) Te = F(T - 1)
C [ ]) T = Te(F - 1)

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 D [ ]) Te = (T)(F)

6) By the use of which of the following the PPM can be converted to PWM?
A [ ]) A stable multivibrator
B [ ]) Integrator
C [ ]) Monostable multivibrator
D [v]) Bistable Multivibrator

7) When a signal is quantized such that the step size S is small in comparison with the
peak to peak range of the signal, the mean square quantization error is equal to
A [ ]) S²
B [ ]) S²/2
C [ ]) S²/6
D [v]) S²/12

8) FM has
A [ ]) two sidebands only
B [ ]) four sidebands only
C [ ]) four sidebands only
D [v]) infinite sidebands

9) Image frequency rejection mainly depends upon

A [v]) detector
B [ ]) mixer
C [ ]) IF
D [ ]) RF

10) Frequency frogging is used in a carrier system to

A [ ]) conserve frequencies
B [ ]) reduce distortion
C [v]) reduce cross talk
D [ ]) none of the above

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11) A plot of modulation index vs carrier amplitude yields a
A [ ]) horizontal line
B [ ]) vertical line
C [ ]) parabola
D [v]) hyperbola

12) A frequency multiplier stage should operate as

A [ ]) class A
B [v]) class B
C [ ]) class AB
D [ ]) class C

13) The most commonly used system of modulating for telegraphy is

A [ ]) single tone modulation
B [ ]) on-off keying
C [v]) frequency shift keying
D [ ]) pulse code modulation

14) Which of the following antennas is not wide band?

A [v]) Marconi
B [ ]) Helical
C [ ]) Folded dipole
D [ ]) Discone

15) The correct sequence of subsystem in an FM receiver is

A [ ]) mixer, RF amplifier, limiter, IF amplifier, discriminator, audio amplifier
B [v]) RF amplifier, mixer, IF amplifier, limiter, discriminator, audio amplifier
C [ ]) RF amplifier, mixer, limiter, discriminator, IF amplifier, audio amplifier
D [ ]) mixer, IF amplifier, limiter, audio amplifier, discriminator

16) Which of the following radio waves are not reflected by ionosphere?

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 A [ ]) Waves above 1 kHz
B [ ]) Waves above 1 MHz
C [ ]) Waves above 10 MHz
D [v]) Waves above 30 MHz

17) Square law modulators utilise

A [ ]) linear range of V-I characteristics of a diode
B [ ]) linear range of V-I characteristics of a triode
C [v]) non-linear region of V-I dynamic characteristics of a diode
D [ ]) non-linear region of V-I dynamic characteristics of a triode

18) For an antenna of height ht metres, the radio horizon is equal to

A [ ]) 4√ht metres
B [v]) 4√ht k metres
C [ ]) 2.5√ht k metres
D [ ]) 2.5√ht metres

19) Which of the following is correct (FDM means Frequency Division Multiplexing and TDM
means Time Division Multiplexing)?
A [ ]) FDM requires lower bandwidth but TDM has more noise immunity
B [ ]) FDM has more noise immunity and requires lower bandwidth than TDM

C [v]) FDM requires channel synchronization while TDM has more noise immunity
D [ ]) FDM requires more multiplexing while TDM requires band pass filter

20) In telephone systems, load is expressed in the unit of

A [v]) erlangs
B [ ]) decibels
C [ ]) bells
D [ ]) watts

21) Pulse stuffing is used in

A [ ]) synchronous TDM

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 B [v]) asynchronous TDM
C [ ]) Any TDM
D [ ]) All

22) Which gives minimum probability of error?

A [ ]) ASK
B [ ]) FSK
C [v]) PSK
D [ ]) DPSK

23) Which one of the following gives maximum probability of error?

A [v]) ASK
B [ ]) DPSK
C [ ]) FSK
D [ ]) PSK

24) FM has poor efficiency than

A [ ]) AM
B [v]) AM-SC
C [ ]) PAM
D [ ]) PCM

25) In which of the following schemes are several channels interleaved and transmitted
together?
A [ ]) TDM
B [v]) FDM
C [ ]) group
D [ ]) subgroup

26) Figure of merit is always unity in

A [ ]) AM
B [v]) SSB-SC
C [ ]) FM

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 D [ ]) All

27) In a square law modulator, the carrier frequency should be __________ times than the
highest modulating frequency.
A [ ]) 1
B [ ]) 2
C [v]) 3
D [ ]) 4

28) Armstrong modulator generates

A [ ]) AM signals
B [ ]) FM signals
C [ ]) PM signals
D [v]) both (b) and (c)

29) Entropy give

A [v]) measure of Uncertainty
B [ ]) rate of Information
C [ ]) average information
D [ ]) probability of Information

30) Circular polarization

A [v]) is useful in reducing depolarization effect on received wave
B [ ]) involves critical alignment of transmitting and receiving antenna
C [ ]) is useful in discrimination between reception of adjacent beams
D [ ]) none of the above

31) To eliminate ghosts in the picture

A [ ]) use a longer transmission line
B [ ]) connect a booster
C [v]) change the antenna orientation of location
D [ ]) twist the transmission line

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32) In a klystron amplifier the input cavity is called
A [v]) buncher
B [ ]) catcher
C [ ]) Pierce gun
D [ ]) collector

33) In a circular waveguide the dominant mode is

A [ ]) TE01
B [v]) TE11
C [ ]) TE20
D [ ]) TE21

34) Microwave resonators are used in

A [ ]) microwave oscillators
B [ ]) microwave narrow band amplifier
C [ ]) microwave frequency metres
D [v]) all of the above

35) In a TWT the amplitude of resultant wave travelling down the helix
A [v]) increases exponentially
B [ ]) increases linearly
C [ ]) decreases exponentially
D [ ]) is almost constant

36) In following which devices use avalanche effect

A [ ]) Impatt
B [ ]) Trapatt
C [v]) Both Impatt and Trapatt
D [ ]) none

37) In a directional coupler

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 A [v]) isolation (dB) equals coupling plus directivity
B [ ]) coupling (dB) equals isolation plus directivity
C [ ]) directivity (dB) equals isolation plus coupling
D [ ]) isolation (dB) equals (coupling) (directivity)

38) As the frequency is increased, the charging MVAR in a cable

A [ ]) decreases
B [v]) increases
C [ ]) remain the same
D [ ]) decreases or remains the scheme

39) Loss angle of a good quality cable is about

A [v]) 1°
B [ ]) 30°
C [ ]) 70°
D [ ]) 90°

40) In a three cavity klystron amplifier, the oscillations are excited in

A [ ]) input cavity
B [ ]) output cavity
C [v]) intermediate cavity
D [ ]) both (a) and (b)

41) Which of the following devices uses a helix?

A [ ]) Klystron amplifier
B [ ]) Klystron oscillator
C [v]) TWT
D [ ]) Both (a) and (b)

42) The diagram to show distance time history of electrons in klystron amplifier is called
A [v]) apple gate diagram
B [ ]) asynchronous diagram

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 C [ ]) bunching diagram
D [ ]) velocity modulation diagram

43) A line has a phase constant of 29.8 rad/m. At 1000 MHz the wavelength is
A [ ]) 29.8 m
B [ ]) 2.98 m
C [ ]) 2.1 m
D [v]) 0.21 m
E [ ]) HINTS-λ=2π/β=2×3.14/29.8=0.21 m

44) The action of backward wave oscillator is similar to that of

A [ ]) klystron amplifier
B [ ]) reflex klystron oscillator
C [v]) TWT
D [ ]) magnetron

45) Which TM mode in rectangular waveguide has lowest cutoff frequency?

A [v]) TM11
B [ ]) TM01
C [ ]) TM10
D [ ]) TM21

46) In a turnstile antenna two-half wave resonant wire radiators are placed at 90° to each
other in the same plane and are excited
A [ ]) in phase
B [ ]) in phase opposition
C [v]) 90° out of phase with each other
D [ ]) 45° out of phase with each other

47) A waveguide section in a microwave circuit acts as

A [ ]) LP filter
B [ ]) Bandpass filter
C [v]) HP filter

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 D [ ]) Band stop filter

48) In a klystron amplifier dc electron velocity is v0 and dc electron charge density is r0 the
dc beam current is
A [v]) r0v0
B [ ]) r0/v0
C [ ]) v0/r0
D [ ]) (v0/r0)2

49) The cut off wavelength in circular waveguide

A [v]) guide diameter
B [ ]) square of guide diameter
C [ ]) cube of guide diameter
D [ ]) square root of guide diameter

50) In high frequency circuits impedance matching can be done by

1. open circuited stubs
2.short circuited stubs
3.transformer
Which of the above correct?
A [v]) 1, 2 and 3
B [ ]) 1 and 2 only
C [ ]) 1 and 3 only
D [ ]) 2 and 3 only

51) The directive gain of a transmitting antenna is proportional to

A [v]) its cross-sectional area
B [ ]) square of cross-sectional area
C [ ]) square root of cross-sectional area
D [ ]) cube root of cross-sectional area

52) If f is the frequency of electromagnetic wave, fc is cutoff frequency, then in a

rectangular waveguide
A [v]) attenuation is low when f > fc
B [ ]) attenuation is low when f < fc

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 C [ ]) attenuation is high when f < fc
D [ ]) either (b) or (c)

53) The correct sequence of parts in klystron amplifier are

A [ ]) anode, catcher cavity, cathode, buncher cavity
B [v]) cathode, buncher cavity, catcher cavity, cavity
C [ ]) anode, buncher cavity, catcher cavity, cathode
D [ ]) cathode, catcher cavity, anode, buncher cavity

54) In a reflex klystron oscillator, repeller electrode is at

A [ ]) low positive potential
B [ ]) high positive potential
C [v]) negative potential
D [ ]) zero potential

55) Which one of the following is transferred locking electron device C antenna?
A [ ]) BARITT diode
B [ ]) IMPATT diode
C [v]) Gunn diode
D [ ]) Step recovery diode

56) For a circular wave guide

A [v]) cutoff frequency for TE10 and TE01 modes are same
B [ ]) cutoff frequency for TE10 and TE01 modes are different
C [ ]) cutoff frequency for TE10 mode = twice the cutoff frequency for TE20 mode
D [ ]) cutoff frequency for TE10 mode = haf the cutoff frequency for TE20 mode

57) In microwave system the function of mode filter is

A [ ]) to suppress modes with lower cut off frequencies
B [ ]) to suppress modes with higher cut off frequencies
C [ ]) to change mode of wave transmission
D [v]) both (b) and (c)

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58) High speed logic circuits use
A [v]) pulses with very small width
B [ ]) pulses with very large width
C [ ]) pulses whose width is neither small nor large
D [ ]) either (b) or (c)

59) To couple a coaxial line to a parallel wire line it is best to use

A [ ]) slotted line
B [v]) balun
C [ ]) directional coupler
D [ ]) λ/4 transformer

60) A balun should have

A [v]) low SWR at both ports
B [ ]) high SWR at both ports
C [ ]) high SWR at input port and low SWR at output port
D [ ]) low SWR at input port and high SWR at output

61) A duplexer is used to

A [ ]) couple two antennas to a transmitter
B [ ]) isolate the antenna from the local oscillator
C [ ]) prevent interference between two antennas connected to receiver
D [v]) use an antenna for reception or transmission without interference

62) A branched duplexer requires

A [ ]) TR tubes
B [ ]) ATR tube
C [v]) both TR and ATR tube
D [ ]) none of the above

63) The main feature of a parametric amplifier is

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 A [ ]) low noise
B [ ]) very high gain
C [v]) broad bandwidth
D [ ]) both (b) and (c)

64) A cavity resonator is

A [v]) a hollow metallic enclosure
B [ ]) a hollow enclosure having magnetic material as its walls
C [ ]) a hollow enclosure having dielectric material as its walls
D [ ]) either (b) or (c)

65) Atomic and molecular resonance is observed in many substances

A [v]) at microwave frequencies
B [ ]) at low frequencies
C [ ]) at frequencies used in AM broadcast
D [ ]) at both (b) and (c)

66) The semiconductor diode which can be used in switching circuit in microwave range is
A [v]) PIN diode
B [ ]) Varactor diode
C [ ]) Tunnel diode
D [ ]) Gunn diode

67) A reflex klystron oscillator uses

A [v]) one cavity resonator
B [ ]) two cavity resonators
C [ ]) three cavity resonators
D [ ]) none of the above

68) Which mode has the lowest cut off frequency in circular wave guides?
A [ ]) TE01
B [v]) TE11

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 C [ ]) TE20
D [ ]) TE20

69) varactor diode be used?

A [ ]) TV tuning
B [ ]) Active filter
C [ ]) Microwave frequency multiplication
D [v]) All of above

70) Power gain of a multicavity klystron amplifier is

A [v]) more than 30 dB
B [ ]) causes retardation of all electrons
C [ ]) causes acceleration of some electrons and retardation of others
D [ ]) none of the above

71) Bunching of electrons occurs in

A [ ]) two cavity klystron amplifier.
B [ ]) multi cavity klystron amplifier.
C [ ]) reflex cavity klystron amplifier.
D [v]) in all

72) Consider the following applications

1.Switch
2.Attenuator
3.Phase shifter
4.Oscillator
In which of the above can a PIN diode be used?
A [ ]) 1 2 3 and 4
B [v]) 1 2 and 3 only
C [ ]) 1 and 2 only
D [ ]) 2, 3 and 4 only

73) Which one of the following is not a negative resistance device?

A [ ]) Gunn diode

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 B [ ]) Tunnel diode
C [ ]) Impatt diode
D [v]) Varactor diode

74) Microwave links are typically 50 km apart

A [ ]) because of atmospheric attenuation
B [ ]) because of output tube power limitation
C [v]) because of earth's curvature
D [ ]) to ensure that applied dc voltage is not excessive

75) Which of the following is wrong for a magic used to tee?

A [ ]) E and H arms are decoupled
B [ ]) A signal into coplanar arm splits equally between E and H arms
C [v]) coplanar arms are coupled
D [ ]) all ports are perfectly matched

76) The expression HZ = C cos(Bx) cos(Ay)yz is for

A [v]) TE wave
B [ ]) TM waves
C [ ]) both TE and TM waves
D [ ]) some TE and some TM waves

77) Which device has internal positive feedback?

A [ ]) Two cavity klystron amplifier
B [ ]) Multi-cavity klystron amplifier
C [v]) Reflex klystron amplifier
D [ ]) All of the above

78) The domain mode in rectangular waveguide is

A [ ]) TE01
B [ ]) TE02
C [v]) TE10

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 D [ ]) TM11

79) The reverse voltage applied to a varactor diode

A [v]) is less than avalanche breakdown voltage
B [ ]) is more than avalanche breakdown voltage
C [ ]) may be more or less than a avalanche breakdown voltage
D [ ]) is very high as compared to avalanche breakdown voltage

80) PIN diode has

A [ ]) p+ and n layers separated by i layer
B [v]) p+ and n+ layers separated by i layer
C [ ]) p- and n- layers separated by i layer
D [ ]) none of the above

81) In a klystron amplifier the bunching effect

A [v]) converts velocity modulation into current modulation of beam
B [ ]) converts current modulation into velocity modulation of beam
C [ ]) both (c) and (b)
D [ ]) neither (a) nor (b)

82) When resonant cavities are coupled together the result is

A [ ]) one resonant frequency
B [v]) n resonant frequencies
C [ ]) n/2 resonant frequencies
D [ ]) either (b) or (c)

83) Which of the following modes of transmission will not be supported by a rectangular
waveguide?
A [ ]) TE15
B [ ]) TE12
C [ ]) TM11
D [v]) TM10

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84) Which one of the following can be used for amplification of microwave energy?
A [v]) TWT
B [ ]) Magnetron
C [ ]) Reflex klystron
D [ ]) Gunn diode

85) A disadvantage of microstrip line as the connections of compared to strip line is that
former
A [ ]) do not lend themselves to printed circuit
B [ ]) are bulky
C [v]) are more likely to radiate
D [ ]) are more expensive and complex

86) The Q factor of a waveguide resonator is given by (ω0 is resonant frequency, U is

energy storage and WL is the power loss)
A [v]) Q=ωoU/WL
B [ ]) Q=WL/ωoU
C [ ]) Q=ωoUWL
D [ ]) NONE

87) In which of the following devices can the operation be visualised in terms of a series
feedback loops?
A [ ]) TWT
B [ ]) Reflex klystron
C [ ]) Klystron amplifier
D [v]) Backward wave oscillator

88) The rotation of direction of E field of a linearly polarized wave passing through a
magnetised ferric medium is called
A [ ]) Lorentz rotation
B [v]) Faraday rotation
C [ ]) Steinmitz rotation
D [ ]) Fleming's rotation

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89) For air filled circular waveguides
A [ ]) the attenuation due to imperfect conducting walls is negligible
B [v]) the attenuation due to imperfect dielectric is negligible
C [ ]) both the attenuation i.e. due to imperfect conducting walls and due to imperfect dielectric
are significant
D [ ]) the total attenuation is almost zero

90) In microwave communication links the fading due to rain occurs. The methods to solve
this problem include
A [ ]) antenna replacement and feed correction
B [ ]) amplitude trimming and phase correction
C [ ]) polarization shifting and code diversity
D [v]) path diversity and frequency diversity

91) Which one of the following is also called 'rat race'?

A [ ]) E plane tee
B [ ]) H plane tee
C [ ]) Magic tee
D [v]) Hybrid ring

92) In microwave circuits, a mode transducer is used to

A [ ]) change mode of wave transmission
B [ ]) change direction of wave transmission
C [ ]) change polarization of wave transmission
D [v]) change mode, direction or polarization wave transmission

93) The most commonly used magnetron is

A [v]) cylindrical
B [ ]) parallel plate
C [ ]) inclined plate
D [ ]) flat plate

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94) The speed at which axial electric field due to signal advances in a TWT is equal to
A [ ]) speed of light
B [v]) (speed of light) (helix pitch helix circumference)
C [ ]) (speed of light) (helix circumference helix pitch)
D [ ]) (speed of light) (helix pitch) (helix circumference)

95) In a microwave power measurement using bolometer, the principle of working is

variation of
A [ ]) inductance with absorption of power
B [v]) resistance with absorption of power
C [ ]) capacitance with absorption of power
D [ ]) cavity dimension with heat generated by power

96) A microwave junction is matched at all ports if the S matrix

A [v]) has all diagonal elements zero
B [ ]) has all diagonal elements equal but not zero
C [ ]) is Hermitian
D [ ]) has all diagonal elements complex

97) Hollow waveguides are used as transmission lines at frequencies

A [ ]) above 1 GHz
B [v]) above 5 GHz
C [ ]) above 10 MHz
D [ ]) above 1 MHz

98) The total power radiated from an antenna system is determined by imagining that the
antenna is at the centre of a very large
A [v]) sphere
B [ ]) rectangle
C [ ]) square
D [ ]) ellipse

99) The electrical requirement on wall thickness of rectangular wave guide is

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 A [v]) wall thickness is more than skin depth
B [ ]) wall thickness is less than skin depth
C [ ]) wall thickness is equal to skin depth
D [ ]) either (b) or (c)

100) Which of the following is used in integrated circuits?

A [v]) Microstrip line
B [ ]) Coaxial line
C [ ]) Twin wire line
D [ ]) Shield cable

101) Wave guides are pressurised above normal atmospheric pressure for
A [v]) increasing the power handling capacity
B [ ]) improving conductivity of walls
C [ ]) preventing higher modes from propagation
D [ ]) varying the wave impedance

102) Microwaves
A [ ]) get reflected by ionosphere
B [ ]) are absorbed by ionosphere
C [v]) are neither reflected nor absorbed by ionosphere
D [ ]) are both reflected and absorbed by ionosphere

103) In a TWT the loss in attenuator is

A [v]) almost equal to forward gain of tube
B [ ]) much less than forward gain of tube
C [ ]) much higher than forward gain of tube
D [ ]) almost infinite

104) For a waveguide, which of the following statements is wrong?

A [ ]) It is usually made of brass or aluminium
B [ ]) It is usually rectangular or circular in shape

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 C [ ]) The dielectric region is usually air
D [v]) The wall thickness is very small as compared to skin depth

105) Klystron amplifier is not used to amplifier very weak microwave signals due to
A [ ]) low gain for weak signals
B [ ]) low noise for weak signals
C [ ]) high noise
D [v]) both (a) and (b)

106) Which of the following modes in circular waveguides are circularly symmetric?
A [ ]) TE01
B [ ]) TE02
C [v]) both (a) and (b)
D [ ]) neither (a) nor (b)

107) Performance of a PIN diode switch is represented by

A [ ]) insertion loss when switch is off
B [ ]) insertion loss when switch is on
C [v]) insertion loss when switch is on and isolation loss when switch is off
D [ ]) insertion loss when switch is off and isolation loss when switch is on

108) The main advantage of TWT over klystron is

A [v]) higher bandwidth
B [ ]) higher gain
C [ ]) higher frequency
D [ ]) higher output

109) If wavelength in free space is λ0 wavelength in insulator λ, µr is relative permittivity or

insulator and r is relative permittivity or insulator, then
A [ ]) λ=λ₀⁄µr.εr
B [v]) λ=λ ₀⁄√µr.εr
C [ ]) λ=µr.εr /√λo

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 D [ ]) none of these

110) A rectangular waveguide has width a. Then at the cutoff frequency (with
corresponding wave length λc)
A [v]) a=λc/2
B [ ]) a=2λc
C [ ]) a=λc/4

D [ ]) a=λc

111) In a shield helix

A [ ]) the spacing between adjacent turns is very large
B [ ]) the spacing between adjacent turns approaches zero
C [v]) the spacing between adjacent turns approaches zero and wire thickness approaches zero
D [ ]) the spacing between adjacent turns is very large wire thickness approaches zero

112) TM01 mode in circular waveguide is analogous to

A [ ]) TM10 mode in square waveguide
B [v]) TM11 mode in square waveguide
C [ ]) TM20 mode in square waveguide
D [ ]) TM02 mode in square waveguide

113) Which of the following modes cannot exist in rectangular resonant cavity?
A [v]) TE110
B [ ]) TE011
C [ ]) TM110
D [ ]) TM111

114) At a frequency equal to cutoff frequency in a rectangular wave guide

A [ ]) the flow of electromagnetic energy is zero
B [v]) the flow of electromagnetic energy is infinite
C [ ]) the flow of electromagnetic energy is 50% of maximum

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 D [ ]) the flow of electromagnetic energy is 10% of maximum

115) In a microwave resistor the wall thickness is made as small as possible to

A [ ]) have high value of R
B [ ]) have low value of R
C [v]) minimize capacitive effect
D [ ]) reduce inductance

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