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# SSC Scientific Assistant Electronics Questions 161 to 180

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Option B : proportional to amplitude

SSC Scientific Assistant Electronics Question No: 176

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

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

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

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

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