Download SGBAU BSc 2019 Summer 4th Sem Electronics Communication Electronics n 8085 Microprocessor Question Paper

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B.Sc. (Part—II) Semester—IV Examination

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4S : ELECTRONICS

(Communication Electronics and 8085 Microprocessor)

Time : Three Hours] [Maximum Marks : 80

Note :— (1) All questions are compulsory.

(2) Draw neat diagrams wherever necessary.

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1. (A) Fill in the blanks :—
   1. ROM stands for __________
   2. The width of address bus in 8085 is __________
   3. FM stands for __________
   4. PPM stands for __________

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2. (B) Choose correct alternative for the following :—
   1. AM is
      1. Frequency modulus
      2. Frequency Modulation
      3. Amplitude modulation
      4. None

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   2. The width of data bus of 8085 is
      1. 2 bits
      2. 4 bits
      3. 8 bits
      4. None

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   3. PWM stands for
      1. Pulse width modulation
      2. Pulse code modulation
      3. Pulse correct code
      4. None

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   4. There are ~ Flags of 8085.
      1. 3
      2. 8
      3. 5
      4. 9

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3. (C) Write answer in one sentence :
   1. What is the function of SP (Stack Pointer) ?
   2. What is OP-code ?
   3. What is Modulation index ?
   4. What is the function of address bus ?

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EITHER

2. (A) Draw the block diagram of AM transmitter and explain the function of each block. 6
   OR
   (B) Explain the FM theory and frequency spectrum of FM wave.

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OR

2. (P) Draw the block diagram of superheterodyne receiver : explain its block diagram. 6
3. (Q) State the needs of modulation. 3
4. (R) What are the advantages of AM ? 3

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EITHER

3. (A) Explain the working of LED as optical source. 6
4. (B) Explain different types of optical fibers. 6

OR

3. (P) Draw the block diagram of fiber optic communication system ; explain function of each block. 6

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4. (Q) Explain the Jointer and Couplers. 6

EITHER

4. (A) Explain PAM and PWM. 6
5. (B) State and explain FDM with help of suitable diagram. 6

OR

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4. (P) What is multiplexing ? Explain TDM. 6
5. (Q) What is PCM ? Explain PCM used in digital communication. 6

EITHER

5. (A) Draw the block diagram of 8085 microprocessor and explain the function of :
   1. ALU
   2. SP

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   3. PC 6
6. (B) Explain one byte, two byte and three byte instructions with suitable example. 6

OR

5. (P) Explain various status Flags with suitable diagram of 8083 microprocessor. 6

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6. (Q) Draw and explain timing diagram for MOV r1, r2 instruction. 6

EITHER

6. (A) Explain the classification of instruction set of 8085 microprocessor with example. 6
7. (B) What is flow chart ? Draw and explain various flow chart symbols. 6

OR

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6. (P) Draw the flow chart and write ALP for finding of minimum of two numbers. 6
7. (Q) Explain the stack and stack related instructions with suitable example. 6

EITHER

7. (A) Draw the block diagram of 8255 PPI and explain the working of each block. 6
8. (B) Explain the control word format for I/O mode of 8255 PPI. 6

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OR

7. (P) Explain Synchronous and Asynchronous data transfer schemes. 6
8. (Q) Explain memory mapped I/O and I/O mapped I/O scheme. 6

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