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For the following questions answer them individually
A cache memory needs an access time of 30 ns and main memory 150 ns, what is the average access time of CPU (assume hit ratio = 80%)?
Which one of the following Boolean expressions is NOT a tautology?
$$((a \rightarrow b) \wedge (b \rightarrow c)) \rightarrow (a \rightarrow c)$$
$$(a \leftrightarrow c) \rightarrow (\sim b \rightarrow (a \wedge c))$$
$$(a \wedge b \wedge c) \rightarrow (c \vee a)$$
$$a \rightarrow (b \rightarrow a)$$
What is the minimum number of two-input NAND gates used to perform the function of two input OR gate?
When two n-bit binary numbers are added the sum will contain at the most
(n + 3) bits
(n + 2) bits
(n + 1) bits
The 2-input XOR has a high output only when the input values are
Advantage of synchronous sequential circuits over asynchronous one is
Lower hardware requirement
Better noise immunity
All of the above
Physical topology of FDDI is?
None of the above
In networking terminology UTP means
Uniquitous teflon port
Uniformly terminating port
Unshielded twisted pair
Unshielded T-connector port
The default subnet mask for a class B network can be
If there are n devices (nodes) in a network, what is the number of cable links required for a fully connected mesh and a star topology respectively
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