Hi students, Welcome to Amans Maths Blogs (AMBIPi). Are you preparing for SSC Scientific Assistant and looking forSSC Scientific Assistant Electronics 161 to 180 with Answer Keys? In this article, you will get previous year questions of SSC Scientific Assistant IMD (Indian Meteorological Department), which helps you in the preparation of government job of SSC IMD Scientific assistant.
SSC Scientific Assistant IMD Previous Year Questions
SSC Scientific Assistant Electronics Question No: 161
What is the disadvantage of SSB- SC over AM modulation ?
Option A : The bandwidth requirement is low in AM
Option B : Thermal noise is low in AM
Option C : Increase power efficiency in AM
Option D : Less complex design of AM
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Option D : Less complex design of AM
SSC Scientific Assistant Electronics Question No: 162
Which among the following is/are the purpose/purposes of pilot signal
1. Equalization
2. Synchronization
3. Continuity
4. Attenuation
Option A : 1 , 2 and 3
Option B : 1 and 2
Option C : 2 and 3
Option D : 2 , 3 and 4
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Option A : 1 , 2 and 3
SSC Scientific Assistant Electronics Question No: 163
A balanced modulator is used in ______
Option A : AM
Option B : FM
Option C : PAM
Option D : SSB – SC
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Option D : SSB – SC
SSC Scientific Assistant Electronics Question No: 164
What is the antenna current of a 60% modulated SSB-SC wave having a carrier wave power of 80 W and impedance of the system as 20 ohms ?
Option A : 0.2 A
Option B : 0.4 A
Option C : 0.6 A
Option D : 0.8 A
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Option C : 0.6 A
SSC Scientific Assistant Electronics Question Paper No: 165
Which among the following are the methods of SSB- SC generation?
1.Phase discrimination
2.Frequency discrimination
3. Product modulator
Option A : 1 only
Option B : 2 only
Option C : 3 only
Option D : 1 and 2 only
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Option C : 1 and 2 only
SSC Scientific Assistant Electronics Question No: 166
Which among the following is TRUE with respect to de-emphasis ?
1. De-emphasis is a complement of pre-emphasis
2. It decreases the magnitude of higher frequencies with respect to the magnitude of other lower frequencies
3. It is used in FM broadcasting
4. It improves the SNR
Option A : 1 and 2
Option B : 1 , 2 and 3
Option C : 1 , 2 and 4
Option D : 2 , 3 and 4
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Option C : 1, 2 and 4
SSC Scientific Assistant Electronics Question No: 167
The bandwidth of an FM wave when the maximum deviation allowed is 50 kHz and the modulating signal has a frequency of 10 kHz , is ______
Option A : 40 kHz
Option B : 50 kHz
Option C : 60 kHz
Option D : 120 kHz
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Option D : 120 KhZ
SSC Scientific Assistant Electronics Question Paper No: 168
In which of the following, the phase modulation of side bands occurs ?
Option A : DSB-SC
Option B : ISB
Option C : SSB-WC
Option D : SSB-SC
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Option B : ISB
SSC Scientific Assistant Electronics Question Paper No: 169
Which among the following AM signals are used in television broadcasting ?
Option A : DSB-WC
Option B : DSB-SC
Option C : SSB-SC
Option D : VSB
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Option D : VSB
Previous Year Question SSC Scientific Assistant Electronics: 170
Which factor of carrier wave is affected by noise ?
Option A : Amplitude
Option B : Amplitude and Phase both
Option C : Position
Option D : Phase
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Option B : Amplitude and Phase both
SSC Scientific Assistant Electronics Question No: 171
The phase modulation and frequency modulation are considered as a special case of ______
Option A : PPM
Option B : PSK
Option C : QAM
Option D : SSB
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Option C : QAM
SSC Scientific Assistant Electronics Question No: 172
The bandwidth of AM is______
Option A : 445 kHz
Option B : 540 kHz
Option C : 600 kHz
Option D : 1110 kHz
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Option D : 111 kHz
SSC Scientific Assistant Electronics Question No: 173
The bandwidth of FM is ______ .
Option A : 20 Hz
Option B : 20 kHz
Option C : 20 MHz
Option D : 1110 kHz
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Option C : 20 MHz
SSC Scientific Assistant Electronics Question No: 174
In TV broadcasting, video signals are transmitted in ______ and audio signals in ______ ?
Option A : AM , FM
Option B : FM , AM
Option C : PM , AM
Option D : PM , FM
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Option A : AM , FM
SSC Scientific Assistant Electronics Question Paper No: 175
In the phase modulated signal , the deviation of frequency is ______.
Option A : constant
Option B : proportional to amplitude
Option C : proportional to frequency
Option D : square of the amplitude
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Option B : proportional to amplitude
SSC Scientific Assistant Electronics Question No: 176
When simple AGC is used in radio receivers ______
Option A : voltage produced between stations is highest
Option B : more accurate output is obtained by increasing the time constant of AGC
Option C : audio stage is controlled by AGC
Option D : the AGC increases with signal strength
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Option D : the AGC increases with signal strength
SSC Scientific Assistant Electronics Question No: 177
The quantization level is a function of ______ in PCM encoding.
Option A : amplitude
Option B : frequency
Option C : cube of amplitude
Option D : cube of frequency
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Option A : amplitude
SSC Scientific Assistant Electronics Question Paper No: 178
Which among the following is a digital system by nature ?
Option A : PAM
Option B : PCM
Option C : PPM
Option D : PWM
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Option B : PCM
SSC Scientific Assistant Question Electronics Paper No: 179
What is the process of converting an analog signal to discrete form called ?
Option A : Modulation
Option B : Multiplexing
Option C : Encoding
Option D : Quantization
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Option D : Quantization
Previous Year Question SSC Scientific Assistant Electronics: 180
Bit depth is ______ .
Option A : the number of quantization level
Option B : the interval between two quantization levels
Option C : the number of possible digital values to represent each samples
Option D : the amplitude to the continuous wave
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Option C : the number of possible digital values to represent each sample
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