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12th Standard Physics English Medium - Electronics and Communication 2 Mark Book Back Question Paper and Answer Key 2022 - 2023 Study Materials Sep-02 , 2022

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12th Standard Physics English Medium - Electronics and Communication 2 Mark Book Back Question Paper and Answer Key 2022 - 2023

Electronics and Communication 2 Mark Book Back Question Paper With Answer Key

12th Standard

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Physics

Time : 00:30:00 Hrs
Total Marks : 44

    2 Marks

    22 x 2 = 44

  1. A transmitting antenna has a height of 40 m and the height of the receiving antenna is 30 m. What is the maximum distance between them for line-of-sight communication? The radius of the earth is 6.4 × 106 m.

  2. Give the factors that are responsible for transmission impairments.

  3. Explain centre frequency or resting frequency in frequency modulation.

  4. What does RADAR stand for?

  5. Define electron motion in a semiconductor.

  6. What do you mean by doping?

  7. A diode is called as a unidirectional device. Explain.

  8. What do you mean by leakage current in a diode?

  9. Draw the input and output waveform of a full wave rectifier.

  10. Explain the current flow in a NPN transistor.

  11. What is the phase relationship between the AC input and output voltages in a common emitter amplifier? What is the reason for the phase reversal?

  12. Explain the need for a feedback circuit in a transistor oscillator.

  13. State De Morgan's first and second theorems

  14. The given circuit has two ideal diodes connected as shown in figure below. Calculate the current flowing through the resistance R1.

  15. An ideal diode and a 5 Ω resistor are connected in series with a 15 V power supply as shown in figure below. Calculate the current that flows through the diode.

  16. A silicon diode is connected with 1kΩ resistor as shown. Find the value of current flowing through AB is

  17. Determine the wavelength of light emitted from LED which is made up of GaAsP semiconductor whose forbidden energy gap is 1.875 eV. Mention the colour of the light emitted (Take h = 6.6 x 10-34 Js).

  18. In a transistor connected in the common base configuration, \(\alpha\) = 0 95, IE = 1 mA. Calculate the values of IC and IB.

  19. In the circuit shown in the figure, the input voltage Vi is 20 V, VBE = 0 V, and VCE = 0 V. What are the values of IB, IC, β?

  20. What is the output Y in the following circuit, when all the three inputs A, B, and C are first 0 and then 1?

  21. In the combination of the following gates, write the Boolean equation for output Y in terms of inputs A and B.

  22. Prove the Boolean identity AC + ABC = AC and give its circuit description.

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