Download OU B.Sc 2016 April 3rd Year 2045 Electronics Question Paper

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Code No. 2045

FACULTY OF SCIENCE

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B.Sc. lll Year Examination, March / April 2016

Subject: ELECTRONICS

Paper - lli : Digital Electronics and Microprocessor

Time : 3 Hours Max.Marks : 100

Note: Answer all questions from Part — A and any four questions from Part - B.

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PART - A (4x20 = 80 Marks)

(Essay Answer Type)

1. a) Explain how NAND gate produces OR, AND, NOT operations.
   b) Discuss the features and action of the following logic circuits:
   (i) TTL logic circuit (ii) CMOS logic circuit
   

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   c) Add: (i) 111₂+ 111₂+ 111₂ (ii) 1011.11₂+1011.01₂
   d) Minimise the four variable logic function using K-map
   f(ABCD)=?m(0,1,2,3,5,7,8,9,11,14)
2. a) Explain the action of 3 bit Full Adder.
   b) Discuss the working of different types of shift registers.
   

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   c) Draw the circuit of JK Master Slave Flip-Flop and explain its action.
   d) Explain the action of De-Multiplexer circuit.
3. a) Explain with a neat diagram the internal architecture of INTEL 8085 µp.
   b) Discuss the various addressing modes of 8085 µp with relevant examples.
   OR
   

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   c) Write an ALP to find the largest number in a data array.
   d) Define instruction cycle, machine cycle, fetch and execute cycles.
4. a) Draw the block diagram of 8255 PPI and briefly explain the features of its different modes of operation.
   b) Explain the organization of semiconductor memory.
   OR
   

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   c) Explain the principle and action of successive approximation A/D converter.
   d) Discuss the performance parameters of D/A converters.

PART - B (4x5 = 20 Marks)

(Short Answer Type)

Note: Answer any four questions.

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1. Convert 1424 into binary and hexadecimal.
2. Discuss the characteristics of logic families.
3. Explain the features of different semiconductor memories.
4. Draw and explain the action of Half Adder Circuit.
5. Explain the conditional flags of 8085 µp.

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6. Write an ALP to perform decimal addition of two 8 bit numbers.
7. Discuss the salient features of stepper motor.
8. Explain the features of various hardware interrupts of INTEL 8085 µp.

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