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Digital Electronics Ii Question Paper

Digital Electronics Ii

Course:Diploma In Medical Engineering

Institution: Mount Kenya University question papers

Exam Year:2011

MT KENYA UNIVERSITY
SCHOOL OF PURE AND APPLIED SCIENCES
DEPARTMENT OF ENGINEERING

DIGITAL ELECTRONICS II
UNIT CODE:PEC 2221 TIME:2 HOURS
INSTRUCTIONS:
*Section A is compulsory
*Attempt any two questions in section B

SECTION A
1a)I)Define the following terms;
*A Register
*A Memory
*A Latch
*An Edge Triggered flip flop
*A Schmitt trigger
II)Explain the operation of the two types of latches using the block symbol and the truth
table. (7 marks)
b)I)Explain the operation of S-R flip flop and state any ONE of its application.

II)List any two differences between asynchronous and synchronous counter. (6 marks)

c)I)Draw a circuit diagram of a stable multivibrator using NAND gate.
II)Explain the operation of the circuit in (I) above. (6 marks)

d) Explain the working of a half adder with the help of logic symbols and truth table.
(6 marks)

SECTION B

2)a)Differentiate between combinational logic circuit and sequential logic circuits.
(4 marks)
b)I)Draw a logic symbol diagram of a four bit-serial load shift register.
II)Use a table to explain its operation. (16 marks)

3)a)I)Distinguish between a decoder and an encoder.
II)Design the combinational logic circuit to act as an active low BCD-to decimal
decoder. (14 marks)
b)I)Determine the number of flip flops required to build a binary counter that counts
from 0 to 1023.
II)Determine the counter's MOD number. (6 marks)

4a) With the help of a diagram, explain a MOD-28 ripple counter. (14 marks)
b) Draw a block diagram of a three bit parallel adder. (6 marks)

Digital Electronics Ii Question Paper

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