ISRO Scientist or Engineer Computer Science May 2017

Instructions

For the following questions answer them individually

Question 21

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%)?

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Question 22

Which one of the following Boolean expressions is NOT a tautology?

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Question 23

What is the minimum number of two-input NAND gates used to perform the function of two input OR gate?

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Question 24

When two n-bit binary numbers are added the sum will contain at the most

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Question 25

The 2-input XOR has a high output only when the input values are

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Question 26

Advantage of synchronous sequential circuits over asynchronous one is

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Question 27

Physical topology of FDDI is?

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Question 28

In networking terminology UTP means

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Question 29

The default subnet mask for a class B network can be

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Question 30

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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