M.C.A. (Semester (CBCS) Examination Nov/Dec-2018
Science
DIGITAL CIRCUITS AND MICROPROCESSORS
Time 2½ Hours Max. Marks: 70
Instructions: All questions are compulsory.
Figures to the right indicate full marks.
Q.1 Choose the correct answer 14
In which of the following gates, the output is if and only if at least one input
is
NOR AND
OR NAND
A one-to-four line demultiplexer is to be implemented using a memory. How
many bits must each word have?
1 bit 2 bits
4 bits 8 bits
A data path, when combined with the control unit, forms a component
referred to as a
Memory Keyboard
Central processing unit Visual display unit
If a logic gates has four inputs, then total number of possible input
combinations is
4 8
16 32
Which table shows the logical state of a digital circuit output for every
possible combination of logical states in the inputs?
Function table Truth table
Routing table ASCII table
Which states that the complement of a sum is equal to the product of
complements?
.
A.B
Which digital system translates coded characters into a more intelligible
form?
Encoder Display
Decoder Counter
A multiplexer is also known as:
Data distribution Data sender
Data receiver Data selector
A full adder can be made out of
Four half adders Two half adders and a OR gate
Two half adders and a NOT gate Three half adders
10) complement of binary number 0101 is
1011 1111 8
1101 1110
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SLR-SN-5
11) In 8085 microprocessor, pin this is used for read operation. It is
an output signal. It is active when low.
R D RD
W R WR
12) NMI stands for
New maskable interrupt Non maskable interpole
Non maskable interrupt New maskable interjector
13) The signal, when the pulse goes high, it indicates address.
When the pulse goes down it indicates data.
ALE BLE
CLE DLE
14) The instruction copies the contents of the source register into the
destination register without any alteration.
LDA STA
XCHG MOV
Q.2 Answer the following. (Any four) 08
What do you mean by Data bus?
What is digital computer?
Define the term Universal gate?
What is the basic unit to measure rate of the data transfer?
State the meaning of term inverter.
Write notes on. (Any two) 06
D-Flip Flop
OR-Invert
ALU
Q.3 Answer the following. (Any two) 08
What are EU and BIU of 8086 microprocessor?
State and compare S R and J K flip flop with neat logic diagram?
What do you mean by Integrated Circuits?
Answer the following. (Any one) 06
What is Adder? Discuss half and full adder in detail.
Explain in detail concept of decoder as digital components?
Q.4 Answer the following. (Any two) 10
Describe in detail addressing modes of 8085?
Describe OR and Ex-OR gate with neat diagram and its truth table.
State Boolean Laws. Discuss De Morgan's theorem with suitable
example.
Answer the following. (Any one) 04
Explain the three basic characteristics of any microprocessor
What do you mean by multiplexer?
d
Q.5 Answer the following. (Any two) 14
What do you mean by K-map? Simplify the Boolean function
F Σ
Draw and explain pin configuration of 8085 microprocessor?
State and explain in detail register and shift register as digital components?