NPTEL Computer Architecture And Organization Assignment 3 Answer

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NPTEL Computer Architecture And Organization Assignment

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1 point

What is the clock cycle time of a machine whose frequency is 1 GHz?

 a.1 ps

 b.1 ns

 c.10 ns

 d.10 ps

Ans – B

1 point

A machine has a CPI of 3, and a single program requires 20 instructions to execute. What will be the execution time if the clock frequency of the machine is 1GHz?

 a.40 ns

 b.50 ns

 c.60 ns

 d.70 ns

Ans – C

1 point

A new machine runs 10 times faster than before. What is the speedup of the new machine over the old machine?

 a.1

 b.5

 c.10

 d.11

Ans – B

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1 point

Which of the following statement(s) is/are false?

 a.In a RISC architecture, the number of instructions/programs, CPI, and clock cycle time increases.

 b.In a RISC architecture, the number of instructions/programs increases, but the CPI and clock cycle time decrease.

 c.In a CISC architecture, the number of instructions/programs decreases, but the CPI, and clock cycle time increase.

 d.RISC architecture performs better than CISC architecture.

Ans – D

1 point

Consider a machine with a clock frequency of 2.5 GHz executing 3000 instructions with an average CPI of 3. Suppose we use a new compiler on the same program for which the new instruction count is 6000, and a new CPI is 1.5, running on a faster machine with a clock rate of 3 GHz. What will be the speedup achieved?

 a.1.0

 b.1.1

 c.1.2

 d.1.3

Ans -B

1 point

The CPI of a machine depends on

 a.Program used

 b.Compiler

 c.Instruction Set Architecture

 d.CPU organization

 e. All of these

Ans – D

1 point

The MIPS rating of a machine is 300 MIPS, and the CPI is 2. What is the clock rate of the machine?

 a.500 MHz

 b.600 MHz

 c.700 MHz

 d.800 MHz

Ans – B

1 point

Consider a processor with two instruction classes, A and B, with corresponding CPI values of 1.5 and 2, respectively. The processor runs at a clock rate of 2.5 GHz. For a given program, the instruction counts for the two types of instructions are 50 million and 10 million, respectively. What are the MIPS rating and the CPU time of the processor?

 a.1579.28 MIPS and 37.992 ms

 b.1580.28 MIPS and 38.992 ms

 c.1581.28 MIPS and 37.992 ms

 d.1579.28 MIPS and 36.992 ms

Ans – C

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1 point

Which of the following statements is/are true for Amdahl’s law?

 a.It expresses the law of diminishing returns.

 b.It expresses the maximum speedup that can be achieved.

 c.It provides a measure to compare the execution times of two machines.

 d.All of these.

Ans – A,B

1 point

The total execution time of a typical program is made up of 40% CPU time and 30% I/O time. Which of the following alternatives is better? Assume that there is no overlap between CPU and I/O operations.

 a.Increase the CPU speed by 50%.

 b.Reduce the I/O time by half.

 c.Both alternatives give the same speedup.

 d.None of these.

Ans – A

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