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CUSTOMER_CODE
SMUDE
DIVISION_CODE
SMUDE
EVENT_CODE
Jan2017
ASSESSMENT_CODE BIT102_Jan2017
QUESTION_TYPE
DESCRIPTIVE_QUESTION
QUESTION_ID
491545_1
What is BCD code? Discuss the Advantages of BCD.
QUESTION_TEXT
In BCD, decimal digits are coded with 4 bit binary code.
(1 mark)
SCHEME OF
EVALUATION
The advantage of BCD encoding is that the conversion of binary
sequence to decimal digits for printing or display is easier and also the
decimal calculation will be faster.
(4 marks)
QUESTION_TYPE DESCRIPTIVE_QUESTION
QUESTION_ID
491546_2
QUESTION_TEXT
Explain how many flip flops are required to design a Mod-5 counter. Give
the state table and excitation table for Mod-5 synchronous counter.
SCHEME OF
EVALUATION
(2 marks)
(1 mark)
(2 marks)
QUE
STIO
DESCRIPTIVE_QUESTION
N_TY
PE
QUE
STIO 491547_3
N_ID
QUE
List the different basic Laws of Boolean Algebra. Explain.
STIO
N_TE
XT
SCHE
List the different basic Laws of Boolean Algebra
ME
OF
i.
Commutative
EVA
LUA
ii.
Associative
TION
iii.
Distributive
(1 mark)
Explanation
i.
Commutative Law: According to this law, the order in which the variables are
ORed or ANDed makes no difference.
A+B=B+A-----Commutative law of addition
AB=BA--------Commutative law of multiplication
ii.
Associative Law: This law states that in the ORing or ANDing of several variables,
the result is the same regardless of the grouping of the variables.
--------Associative Law of addition
-------Associative law of
multiplication
(2 marks)
3.
Distributive Law: According to this law, a Boolean expression can be expanded by
multiplying term-by term just the same as in ordinary algebra.
(2 marks)
QUESTION_TYPE
DESCRIPTIVE_QUESTION
QUESTION_ID
491548_4
Write a note on combinational circuits.
QUESTION_TEXT
Combinational circuits are those whose outputs depend only on the
current inputs.
SCHEME OF
EVALUATION
Characteristics: i) the output depend only on the levels present at
input terminals.
i.
Do not use any memory
ii.
Can have an n number of inputs and m number of
outputs.(2+3=5)
QUESTION_TYPE
DESCRIPTIVE_QUESTION
QUESTION_ID
491549_5
What is multiplexer? Explain the operation of Multiplexer.
QUESTION_TEXT
Multiplexing is the operation of sending one or more analog or digital
signals over a common transmission line at different times or speeds and
as such, the device is called a MUX or Multiplexer.
SCHEME OF
EVALUATION
(2 marks)
Multiplexer operate like a very fast acting multiple position rotary
switches connecting or controlling multiple data input lines called “
channels” one at a time to the output.
(3 marks)
QUESTION_TYPE DESCRIPTIVE_QUESTION
QUESTION_ID
491550_6
Explain the term Excitation table.
QUESTION_TEXT
Excitation table lists the present state, the next state and the flip-flop inputs
required to achieve that.
SCHEME OF
EVALUATION
(2 marks)
Referring to the above fig, if the output is in ‘0’ state and if we want the
next state to be ‘1’ state on occurrence of the clock pulse, then J input must
be in the ‘1’ state and the ‘K’ input can be either in the logic ‘0’ or logic ‘1’
state indicated by X. This is true as for a ‘0’ to ‘1’ transition is concerned.
There are two possible input conditions that can achieve this. These are
when J=1, K=0 and J=K=1, which further leads to J=1,
K=X.
(3 marks)
QUESTION_
DESCRIPTIVE_QUESTION
TYPE
QUESTION_I
491551_7
D
QUESTION_
TEXT
What are the different steps that are used for 1’s complement Subtraction?
i.
Take a 1’s complement of the subtrahend
(2.5 marks)
ii.
Add the 1’s complement of the subtrahend to the minuend
(2.5 marks)
SCHEME OF iii. If a carry is generated after addition, then the result is positive. This carry is
EVALUATIO called end around carry. Remove this end around carry and add it to the result to
N
get the final
answer.
(2.5 marks)
iv. If there is no carry generation after addition, then the result is negative and
it is in 1’s complement form. So get the 1’s complement of the result and attach
negative sign. This will give final
answer.
(2.5 marks)
QUESTION_T
DESCRIPTIVE_QUESTION
YPE
QUESTION_I
491552_8
D
QUESTION_T Explain various parameters usually considered while designing logic gates or
EXT
logic circuits.
i.
DC power supply voltage
(3 marks)
SCHEME OF
EVALUATIO ii.
N
Noise immunity
(3 marks)
ii.
Propagation Delay
(1 mark)
iv.
Power dissipation
(1 mark)
v.
Fan in
(1 mark)
vi.
out
Fan
(1 mark)
QUESTION_TYPE
DESCRIPTIVE_QUESTION
QUESTION_ID
491553_9
Explain Triggering of flip flops.
QUESTION_TEXT
It is possible to change the output of a flip flop with the help of a clock
pulse commonly known as a trigger pulse. When the trigger pulse is
applied to the input of flip flop then the flip flop is said to be triggered,
(6 marks)
SCHEME OF
EVALUATION
Sequential circuits like registers and counters require trigger pulses. The
number of trigger pulses applied to the input of the circuit determines the
number in a counter. A single pulse makes the bit move one position,
when it is applied onto a register that stores multi bit data.
(4 marks)
QUESTION_TYPE
DESCRIPTIVE_QUESTION
QUESTION_ID
491554_10
Discuss in detail on positive logic system and negative logic system.
QUESTION_TEXT
SCHEME OF
A positive logic system is a logic system in which the higher of the two
EVALUATION
voltages levels is represented by binary 1 and the lower level is
represented by binary 0. i.e HIGH=1 LOW=0
(5 marks)
A negative logic system is a logic system in which the higher of the two
voltage level is represented by binary 0 and the lower level is
represented by binary 1. i.e HIGH=0; LOW=1
(5 marks)