These are Multi-Core Computer Architecture Nptel Week 9 Answers
Q1. Which component of access time in Hard Disk dominates for very short seeks (2-4 cylinders)? Settle time Coast time Speedup time Slowdown time
Answer: Settle time
Q2. In a DRAM system that follows open row buffer management policy, which of the following sequence of commands are generated if the new request is to a different row from the row that was accessed last? Activate Precharge followed by CAS Activate followed by Precharge Precharge followed by Activate
Answer: Precharge followed by Activate
These are Multi-Core Computer Architecture Nptel Week 9 Answers
Q3. Which of the following is NOT a function of the DRAM controller? Translate memory requests to DRAM command sequences. Manage power consumption and thermals in DRAM. Buffer and schedule incoming memory requests. Reorganizing the stored data in DRAM for better space utilization
Answer: Reorganizing the stored data in DRAM for better space utilization
These are Multi-Core Computer Architecture Nptel Week 9 Answers
Q4. What is the primary goal of disk scheduling algorithms? Minimize bits required to store a file Maximize rotational latency Minimize seek time Maximize bit-cell density
Answer: Minimize seek time
These are Multi-Core Computer Architecture Nptel Week 9 Answers
Q5. What is the purpose of the refresh operation in DRAM? To maintain high data density To lower manufacturing costs To prevent data loss over time To increase data access speed
Answer: To prevent data loss over time
These are Multi-Core Computer Architecture Nptel Week 9 Answers
Q6. A 64 GB DRAM system that uses 4 channels (C0, C1, C2 and C3) has 2048 columns per row. It uses 64-bit wide memory bus to transfer data from DRAM to the processor. If adjacent memory words are mapped on to adjacent memory channels, which channel will fetch the physical address 0x2953A1B5C? C0 C1 C2 C3
Answer: C3
These are Multi-Core Computer Architecture Nptel Week 9 Answers
Q7. A 4 GB hard disk that has only 1 magnetic surface for storing data has 256 cylinders and there are 128 sectors per track. If all sectors/cylinder are storing same amount of data, the maximum size of a file that occupies 8 sectors of a cylinder in KB is ______.
Answer: 1024
These are Multi-Core Computer Architecture Nptel Week 9 Answers
Q8. A disk drive has 200 cylinders numbered from 0 to 199. The disk arm is initially positioned at cylinder 50. There are now five pending disk requests (cyliner numbers) in the queue: 72, 55, 40, 90, 5. Calculate the total head movements to service all these requests using the SSTF disk scheduling algorithm.
Answer: 155
Q9. Consider a 1MB DRAM on a single DIMM with two ranks, 16 banks (named as B0, B1, B2.. B15) per rank and 32 columns per row. The data bus width is 16 bytes. The addressing uses row interleaving. Which of the following physical addresses is mapped to bank number B5? 0x72AC6 0x55587 0x65B24 0x578B5
Answer: 0x72AC6
These are Multi-Core Computer Architecture Nptel Week 9 Answers
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