Electronics and Communication Engineering - Exam Questions Papers
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26.
If the memory chip size is 256 x 1 bits, then the number of chips required to make up 1 kB (1024) bytes of memory is
Answer: Option
Explanation:
.
27.
A coil has a designed for high Q performance at a rated voltage and a specified frequency. If the frequency of operation is doubled, and the coil is operated at the same rated voltage, then the Q factor and the active power P consumed by the coil will be affected as follows.
Answer: Option
Explanation:
ω2L = 2ω1L, R remains constant
∴ Q2 = = 2Q1 i.e. Q is doubled
for a high a coil ωL >> R
∴
i.e. P decreases 4 times.
28.
The number of variables in a function is odd and the number of minterms with even number of 0's are same as the number of minterms with odd number at 1 's, the expression formed can be represented in __________ as well as __________ form.
Answer: Option
Explanation:
With odd number of variables (n) terms with even number of 0's and terms with odd number of 1 's are the same.
Thus the k-map for the above condition with minterms represented by terms with even number of 0's is
for n = 3
∴ The expression can be represented by equivalence (EX NOR) or (EX OR) expressions.
29.
Find the number of loop equation and number of possible trees for the given graph.


Answer: Option
Explanation:
In any graph, Number of loop equations L = B - N + 1
where B = Number of branches, N = Number of nodes.
Given B = 14, N = 8
∴ L = B - N + 1 = 7
The total number of trees possible
T = NN - 2 = 88 - 2 = 262144.
30.
The number of open right half plane poles of
is

Answer: Option
Explanation:
Use Routh criteria.
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