ISRO Scientist or Engineer Computer Science 2007

Instructions

For the following questions answer them individually

Question 11

Consider a set of n tasks with known runtimes $$r_{1} r_{2}....... r_{n}$$, to be run on a uniprocessor machine. Which of the following processor scheduling algorithms will result in the maximum throughput?

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Question 12

Consider a job scheduling problem with four jobs $$J_{1}, J_{2} J_{3}$$ and $$J_{4}$$, with corresponding deadlines : $$(d1_{1}, d_{2}, d_{3}, d_{4}) = (4, 2, 4, 2)$$

Which of the following is not a feasible schedule without violating any job deadline?

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Question 13

By using an eight bit optical encoder the degree of resolution that can be obtainedis (approximately)

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Question 14

The principal of locality of referencejustifies the use of

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Question 15

Consider the following psuedocode
x := 1;
i := 1;
while (x $$\leq$$ 1000)
begin
x := $$2^{x}$$;
i := i + 1;
end;
What is the value of i at the end of the pseudocode?

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Question 16

The five items: A, B, C, D, and E are pushed in a stack, one after the other starting from A. The stack is popped four times and each element is inserted in a queue. Then two elements are deleted from the queue and pushed back on the stack. Now one item is popped from the stack. The popped item is

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Question 17

Round Robin scheduling is essentially the pre-emptive version of

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Question 18

The number of digit 1 present in the binary representation of
$$3 \times 512 + 7 \times 64 + 5 \times 8 + 3$$ is

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Question 19

Assumethat each character code consists of 8 bits. The number of characters that can be transmitted per second through an synchronous Serial line at 2400 baud rate, and with two stop bits is

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Question 20

If the bandwidth of a signal is 5 kHz and the lowest frequencyis 52 kHz, what is the highest frequency

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