Electronics MCQ

1. In LTE network architecture, the interface between the internet and PDN gateway is: Um SS7 S5 SGi   2. What is Mobile communication? Allows to communicate from different locations without the use of physical medium Allows to communicate from different locations with the use of physical medium Allows to communicate from same locations without …

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1. In a radio receiver, which of the following stages does not need alignment _____ TRF stage IF stage Antenna input stage Audio stage   2. Which of the following is the earliest type of AM receiver? Tuned Radio Frequency (TRF) Receiver Regenerative Receiver Decoherer Receiver None of the above   3. The stages of …

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1. Gaussian process is a Wide sense stationary process Strict sense stationary process Both 1 and 2 None of the mentioned   2. The random variable $Y = \mathop \smallint \limits_{ – \infty }^\infty W\left( t \right)\phi \left( t \right)dt,$ where $\phi \left( t \right)=\;\left\{ {\begin{array}{*{20}{c}} {1;}&{5 \le t \le 7}\\ {0;}&{Otherwise} \end{array}} \right\}$ And …

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1. In FM modulation, when the modulation index increases, the transmitted power is Increased Decreased Unchanged None of these   2. Reactance modulator and varactor diode are used in the _____ method. DSB –SC generation DSB –SC reception SSB generation FM generation   3. FM is a part of general class of modulation known as …

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1. In a communication system at 300 MHz, the receiving antenna gain is 8 dBi, the transmitting antenna gain is 10 dBi and the transmitting power level is 25 watts, the distance between the transmitter and the receiver is 1 km, the power received at the receiving antenna port (assuming the propagation medium is loss-less): …

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1. One of the main functions of the RF amplifiers in a super-heterodyne receiver is to Provide improved tracking Permit better adjacent channel rejection Increase the tuning range of the receiver Improve the rejection of the image frequency   2. A Pre-emphasis circuit provides extra noise immunity by Boosting the base frequencies Amplifying the higher …

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1. Discrete source S1 has 4 equiprobable symbols while discrete source S2 has 16 equiprobable symbols. When the entropy of these two sources is compared, the entropy of: S1 is greater than S2 S1 is less than S2 S1 is equal to S2 Depends on rate of symbols/second   2. A (7, 4) block code has a generator matrix as …

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1. In TV transmission which modulation is employed for picture and sound. AM for picture and FM for sound are employed FM for picture and AM for sound are employed FM is employed for both picture and sound AM is employed for both picture and sound   2. In an amplitude modulated signal, modulating frequency …

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