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Electromagnetic Wave And Communication Mcq
Quiz 9
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Q.1
In radio and television broadcast, the information signal is in the form of
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a) analog signal
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b) digital signal
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c) Both analog and digit signals
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d) neither analog nor digital signal
Explanation
Answer: (a)
Q.2
In light modulation, which characteristic of the carrier light wave is varied?
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a)Amplitude
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b) Frequency
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c)Phase
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d)intensity
Explanation
Answer: (d)
Q.3
Though which mode of communication can radiowaves be sent from one Plate toanother?
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a)Ground wave ProPagation
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b)sky wave Propagation
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c)Space wave ProPagation
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d)All of the above
Explanation
Answer: (d)
Q.4
Which range of Frequencies is Suitable for sky wave Propagation ?
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a) 1 KHz to 500 KHz
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b) 1 MHz to 2 MHz
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c)2 MHz to 20 MHz
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d)Above 30 MHz
Explanation
Answer:(c)
Q.5
Which of the Following is not a component of communication System ?
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a) Transmitter
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b) Transmission channel
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c) Noise
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d) Receiver
Explanation
Answer: (c)
Q.6
Device which transform one form of energy in to another form of energy is called a
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a)Transducer
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b)Transformer
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c)Transponder
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d)Transistor
Explanation
Answer: (a)
Q.7
----- is a link between the transmitter and receiver
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a)Microphone
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b)Transmission Channel
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c)transducer
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d)telephone
Explanation
Answer: (b)
Q.8
______in the receiver section are used to reduce the level of noise signal
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a) filter circuit
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b) Modulator
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c)de modulator
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d)Amplifier
Explanation
Answer:(a)
Q.9
The minimum distance a up to which T.V transmission from a T.V. tower of height h canbe received is Proportional to
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a) h1/2
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b) h
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c) h3/2
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d) h2
Explanation
Answer: (a)
Q.10
For an amplitude modulated wave, the maximum amplitude is found to be 9V while theminimum amplitude is found to be 3V. The modulation index is
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a)100%
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b)75%
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c)50%
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d)25%
Explanation
Answer: (c)
Q.11
AM is used for broadcasting because
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a) it is more noise innumerable than other modulation system
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b) it requires less transmitting power compared with other system
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c)it's avoids receiver complexity....
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d)No other modulation system can provide the necessary band width faithful transmission
Explanation
Answer:(c)
Q.12
Frequencies in the UHF range normally propagation by means of
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a) ground waves
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b) sky waves
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c) surface waves
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d) space waves
Explanation
Answer: (d)
Q.13
The area to be covered for T.V telecast is doubled. Then the height to transmittingantenna will have to be
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a)doubled
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b) halved
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c)quadrupled
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d)kept unchanged
Explanation
Answer: (a)
Q.14
Suppose the amplitude of modulated wave equal to the signal amplitude. Then modulation is
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a)10%
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b)25%
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c)50%
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d)100%
Explanation
Answer: (d)
Q.15
Space waves are generally propagated in
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a)UHF
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b) VHF
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c)HF
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d)None of there
Explanation
Answer:(a)
Q.16
If the frequency of 3 KHz has to be transmitted through amplitude modulation. Whichof the following frequency should use as a carrier frequency ?
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a) 30 Hz
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b) 300 Hz
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c) 3000 Hz
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d) 3 MHz
Explanation
Answer: (d)
Q.17
The range of frequencies allotted for commercial FM radio broadcast is
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a)88 to 108 MHz
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b)88 to 108 KHz
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c)8 to 88 MHz
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d)88 to 108 GHz
Explanation
Answer: (a)
Q.18
The process of super imposing signal frequency on the carrier wave is known as
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a) transmission
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b) reception
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c)modulation
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d)detection
Explanation
Answer: (c)
Q.19
A T.V tower has a height 150m. What is the population density around the T.V towerif the total population covered is 50 lakh ? (Radius of earth=6.4× 106 m)
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a) 82.6/km2
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b) 800.6/km2
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c)828.6/km2
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d)876.6/km2
Explanation
Answer:(c)
Q.20
If M1 and M2 are the refractive indices of the material of core and cladding of an opticalfibre, than the loss of light due to its leakage can be minimized by having
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a) M1 > M2
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b) M1 < M2
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c) M1=M2
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d) None of these
Explanation
Answer: (a)
Q.21
Through which mode of propagation, the radio waves can be sent from one place toanother ?
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a)ground wave propagation
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b) sky wave propagation
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c)space wave propagation
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d)all of them
Explanation
Answer: (d)
Q.22
A radio can tune to any station in the 7.5 MHz to 12 MHz band. What is thecorresponding wave length band ?
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a)400m - 250m
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b)40m - 25m
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c)4m - 2.5m
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d)None of these
Explanation
Answer: (a)
Q.23
Consider an optical communication system operating at λ=800 nm . Suppose only 1% ofthe optical source frequency is the available channel bandwidth for opticalcommunication. No. of channels that can be accommodated for transmitting video T.Vsignals requiring an approximate band width of 4.5 MHz is .
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a)3.8×1014
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b) 3.8×1012
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c)8.4×105
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d)1.71×107
Explanation
Answer:(c)
Q.24
A signal em=20sin 2000 πt amplitude modulates a carries wave ec=80 sin 2000 00 πt .The percentage of modulation is
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a) 25%
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b) 0.25%
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c) 400%
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d) 40%
Explanation
Answer: (a)
Q.25
A transmitting antenna at the top of a tower has a height of 50m and the height of thereceiving antenna is 32m. The maximum distance between them for satisfactorycommunication in line of right mode is . Given radius of earth R=6400 km
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a)25.29×103km
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b)20.23×103km
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c)45.5km
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d)None of these.
Explanation
Answer: (c)
Q.26
The characteristic impendence of a co-axial cable is between .
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a)10Ωto 20Ω
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b)20Ω to 30Ω
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c)30Ω to 60Ω
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d)50Ωto 70Ω
Explanation
Answer: (d)
Q.27
In order to cover a circular region of radios 128 km, by a TV transmitter, What must bethe height of the transmitting antenna ?
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a)79 m
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b) 1050 m
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c)1280 m
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d)1560 m
Explanation
Answer:(c)
Q.28
The frequency of carries wave emitted from L - C oscillator of 10 μ H inductance and1 nF capacitor is .
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a) 1592 KHz
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b) 1592 Hz
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c) 1592 MHz
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d) 159.2 Hz
Explanation
Answer: (a)
Q.29
If the band width is 1.6×1012Hz , how many communication channels can be obtainedwith 16 KHz band width radio signal ?
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a) 1015
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b) 1011
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c)1010
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d)108
Explanation
Answer: (d)
Q.30
A transmitter transmit a power of 10 kw when modulation is 50%. What is the powerof carrier wave ?
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a)12 KW
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b) 7.0 KW
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c)8.89 KW
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d)5.0 KW
Explanation
Answer: (c)
0 h : 0 m : 1 s
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