Digital Electronics Question Paper

Digital Electronics

Course:

Institution: Kenya Technical Teachers College question papers

Exam Year:2015

KENYA TECHNICAL TEACHERS COLLEGE
ELECTRICAL ENGINEERING DEPARTMENT
MODULAR DIPLOMA
DIGITAL ELECTRONICS
CAT 1
TIME: 1hr
INSTRUCTIONS
This paper has three questions
Answer all the questions
1. a) Briefly explain the following terms.
I) Binary
II) Decimal
(2 marks)
b) Convert the following decimal numbers to their binary equivalents:
I) 64
II) 34.75
III) 111
Iv) 27.1875
(4 marks)
c) Convert the following binary numbers to their decimal equivalents:
I) 001100
II) 011100
III) 11100.011
IV) 110011.1001
(4 marks)
d) convert the following binary numbers to their hexadecimal equivalents:
I) 1001.1111
II) 110101.011001
( 2 marks)
e) Explain the following signed decimal number in 8-bit 2'''' complement.
I) -35
II) -100
III) +20
(3 marks)
2. a) I) Explain the following terms
i) weighted code
ii) non weighted code
(1 mark).
II) Express decimal number 527 in (i)BCD,( ii) 2421 codes (6 marks)
b) i) Convert the following Gray code numbers to their straight binary equivalent
I) 1111101
II) 101011011
(4 marks)
ii) Convert the following straight binary numbers to their Gray code equivalents:
I) 10110000
II) 100010010
(4 marks)
3. a) With the aid of a symbol and truth tables explain the operation of basic logic gates. (6 marks)
b) Define the following terms as used in logic integrated circuits.
i) propagation delay
ii) fanin
iii) fanout
(3 marks)
c) Explain with the aid of a diagram the following terms as used integrated circuits
i) valid logic 1 voltage
ii) valid logic 0 voltage.
(6 marks)

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