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Comments
Question
If the functions
w, x, y, z
are as follows.
w
= R +
P
Q +
R
S ,
x
= PQ
R
S
+ PQ
R
S
+ P
Q
R
S
Then
Options
A.
w = z x = z
B.
w = z, x = y
C.
w = y
D.
w = y = z
Correct Answer
w = z x = z
Explanation
Use k-map, then it will be easy.
Digital Electronics problems
Search Results
1. Zero suppression is not used in actual practice.
Options
A. True
B. False
Show Answer
Scratch Pad
Discuss
Correct Answer: False
Explanation:
Zero suppression is commonly used.
2. For the truth table of the given figure Y =
Options
A. A + B + C
B.
A
+ BC
C.
A
D.
B
Show Answer
Scratch Pad
Discuss
Correct Answer:
B
Explanation:
Y =
A
B
C
+
A
B
C + A
B
C
+ A
B
C =
A
B
(
C
+ C) + A
B
(
C
+ C) =
A
B
+ A
B
=
B
(A + A) =
B
.
3. The number of distinct Boolean expression of 4 variables is
Options
A. 16
B. 256
C. 1024
D. 65536
Show Answer
Scratch Pad
Discuss
Correct Answer: 65536
Explanation:
2
2
n
= 2
2
4
= 2
16
.
4. For the K map in the given figure the simplified Boolean expression is
Options
A.
A
C
+
A
D
+ ABC
B.
A
C +
A
D
+ ABC
C.
A
C +
A
D
+ ACD
D.
A
C
+
A
D
+ AB
C
Show Answer
Scratch Pad
Discuss
Correct Answer:
A
C
+
A
D
+ ABC
Explanation:
5. The expression Y =
p
M (0, 1, 3, 4) is
Options
A. POS
B. SOP
C. Hybrid
D. none of the above
Show Answer
Scratch Pad
Discuss
Correct Answer: POS
Explanation:
This is product of sums expression.
6. The access time of a word in 4 MB main memory is 100 ms. The access time of a word in a 32 kb data cache memory is 10 ns. The average data cache bit ratio is 0.95. The efficiency of memory access time is
Options
A. 9.5 ns
B. 14.5 ns
C. 20 ns
D. 95 ns
Show Answer
Scratch Pad
Discuss
Correct Answer: 14.5 ns
Explanation:
Access time = 0.95 x 10 + 0.05 x 100.
7. An OR gate has 4 inputs. One input is high and the other three are low. The output
Options
A. is low
B. is high
C. is alternately high and low
D. may be high or low depending on relative magnitude of inputs
Show Answer
Scratch Pad
Discuss
Correct Answer: is high
Explanation:
In OR any input high means high output.
8. Which of the following is non-saturating?
Options
A. TTL
B. CMOS
C. ECL
D. Both (a) and (b)
Show Answer
Scratch Pad
Discuss
Correct Answer: ECL
Explanation:
Since it is non-saturating, ECL has low propagation delay.
9. A device which converts BCD to seven segment is called
Options
A. encoder
B. decoder
C. multiplexer
D. none of these
Show Answer
Scratch Pad
Discuss
Correct Answer: decoder
Explanation:
Decoder converts binary/BCD to alphanumeric.
10. A 12 bit ADC is used to convert analog voltage of 0 to 10 V into digital. The resolution is
Options
A. 2.44 mV
B. 24.4 mV
C. 1.2 V
D. none of the above
Show Answer
Scratch Pad
Discuss
Correct Answer: 2.44 mV
Explanation:
.
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