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397.

A CPU has 24-bit instructions. A program starts at address 300 (in decimal). Which one of the following is a legal program counter (all values in decimal)? [1 mark]
(A) 400
(B) 500
(C) 600
(D) 700

asked in Computer Science And Engineering, 2006

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398.

You are given a free running clock with a duty cycle of 50% and a digital waveform f which changes only at the negative edge of the clock. Which one of the following circuits (using clocked D flip-flops) will delay the phase of f by 180°? [1 mark]

last reply by CpjJwWHV • 11 years ago • asked in Computer Science And Engineering, 2006

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399.

Consider the following grammar.
S → S * E
S → E
E → F+E
E →F
F → id
Consider the following LR(0) items corresponding to the grammar above.
(i) S → S *.E
(ii) E → F. + E
(iii) E → F + .E
Given the items above, which two of them will appear in the same set in the canonical sets-of-items for the grammar? [1 mark]
(A) (i) and (ii)
(B) (ii) and (iii)
(C) (i) and (iii)
(D) None of the above

asked in Computer Science And Engineering, 2006

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400.

Consider three CPU-intensive processes, which require 10, 20 and 30 time units and arrive at times 0, 2 and 6, respectively. How many context switches are needed if the operating system implements a shortest remaining time first scheduling algorithm? Do not count the context switches at time zero and at the end. [1 mark]
(A) 1
(B) 2
(C) 3
(D) 4

asked in Computer Science And Engineering, 2006

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401.

For which one of the following reasons does Internet Protocol (IP) use the time-to-live (TTL) field in the IP datagram header? [1 mark]
(A) Ensure packets reach destination within that time
(B) Discard packets that reach later than that time
(C) Prevent packets from looping indefinitely
(D) Limit the time for which a packet gets queued in intermediate routers.

asked in Computer Science And Engineering, 2006

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402.

A relation R is defined on ordered pairs of integers as follows:
(x,y) R(u,v) if x < u and y > v. Then R is: [1 mark]
(A) Neither a Partial Order nor an Equivalence Relation
(B) A Partial Order but not a Total Order
(C) A Total Order
(D) An Equivalence Relation

asked in Computer Science And Engineering, 2006

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