Computer Architecture and Organization Week 3 Answers Nptel
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Computer Architecture and Organization Week 3 Answers (July-Dec 2025)
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Question 1. What is the clock cycle time of a processor that operates at a clock rate of 2.0 GHz?
a) 1.0 ns
b) 0.5 ns
c) 20 ns
d) 0.25 ns
Question 2. A program executes a total of 50,000,000 instructions. The average CPI for the program is 2.7, and the CPU clock frequency is 2.0 GHz. How much time is needed to execute the program?
a) 0.0550 sec
b) 0.0755 sec
c) 0.0675 sec
d) 0.0825 sec
Question 3. A program runs in 10 seconds on machine A. For the same program, machine B takes 25 seconds. What is the speedup of machine A over machine B?
a) 0.4
b) 7.5
c) 3.0
d) 2.5
Question 4. Machine A has a CPI of 2.3 for a program. Machine B runs the same program with 20% fewer instructions and has a CPI of 1.7 at a clock rate of 1.2 GHz. What should the clock rate of machine A be for both machines to have the same performance?
a) 2.04 GHz
b) 1.50 GHz
c) 2.45 GHz
d) 1.84 GHz
Question 5. A program runs on a machine with three instruction types. A CPU designer proposes two separate enhancements: (a) reduce the CPI of instruction type A to 1.1, or (b) reduce the CPI of instruction type B to 1.6. Based on the data below, which option offers better performance?
a) Option (a) is better
b) Option (b) is better
c) Both options provide the same performance
Question 6. What kind of programs are Whetstone and Dhrystone, which are created artificially to match the average frequency of operations from a large set of programs?
a) Real applications
b) Kernel benchmarks
c) Toy benchmarks
d) Synthetic benchmarks
These are Computer Architecture and Organization Week 3 Answers Nptel
Question 7. The execution time of a program is 50 seconds, with multiplication operations consuming 42 seconds of that time. If we want the program to run 5 times faster, by what factor must the multiplier speed be improved?
a) 15
b) 21
c) 8
d) Cannot be improved enough
These are Computer Architecture and Organization Week 3 Answers Nptel
Question 8. For a particular program, 60% of the execution time is CPU time and 40% is I/O time. There is no overlap between CPU and I/O. Which of the following two options yields better performance? (I) Increase the CPU speed by 50% (S = 1.5). (II) Reduce the I/O time by half (S = 2).
a) Option (I) is better
b) Option (II) is better
c) Both options achieve the same speedup
Question 9. Consider a memory system where memory operations initially consume 40% of the total execution time. Adding a cache speeds up memory accesses by a factor of 8. What is the overall speedup?
a) 1.91
b) 1.54
c) 0.91
d) 1.67
Question 10. Consider a system with a two-level cache (L1 and L2). Without any cache, memory operations take 30% of the total execution time. The L1-cache speeds up 80% of memory operations by a factor of 4. The L2-cache speeds up 50% of the remaining 20% of memory operations by a factor of 2. Calculate the overall speedup.
a) 1.55
b) 1.24
c) 1.82
d) 2.10
These are Computer Architecture and Organization Week 3 Answers Nptel