65.

66.

67.

68.

69.

70.

095/23

A computer has a cache, main memory, and a disk used for virtual memory. What
is the average time in nanoseconds required to access a referenced word on this
system ? Using the case provided in table below :

Location of referenced word Probability

Not in cache but in main memory
Not in cache or in main memory 12000

A) 251 B) 400.2
C) 350 D) 502.8

Consider a machine with a byte addressable main memory of 216 bytes and block
size of 8 bytes. Assume that a direct, mapped cache consisting of 32 lines is used
with this machine. How is a 16-bit memory address divided into tag, line number,
and byte number ?

A) (8, 4, 7) 8) (6, 4, 8)

C) (6, 2, 7) D) (8, 5, 3)

What is the disk capacity of a magnetic disk drive with 8 surfaces, 512 tracks per
surface, and 64 sectors per track with sector size 1 KB ?

A) 512 KB B) 64 KB

C) 256 MB D) 128 MB

Consider a 32-bit microprocessor having 32-bit instructions composed of two fields,
the first byte contains the opcode and the remainder the immediate operand or
an operand address. What is the maximum directly addressable memory capacity
(in bytes) ?

A) 16 MBytes B) 8 MBytes

C) 32 MBytes D) 64 MBytes

The number of 3 to 8 line decoders to construct a 9 to 512 line decoder with an
enable input and without using any other logic gates are

A) 56 B) 73

C) 69 D) 91

A given microprocessor has words of 1 byte. What is the smallest and largest
integer that can be represented in the Ones complement representations ?

A) 0; 255 B) -127;127
C) 0,99 D) None of the above