NPTEL Advanced Computer Architecture Week 1 Assignment Answers 2025
1. In Dennard scaling, the___________ remains constant while the_________ increases exponentially.
- power-density, performance per watt
- performance per watt, power-density
- performance per watt, number of transistors per chip
- number of transistors per chip, power-density
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2. Select the most appropriate option.
S1: Two instructions can be executed simultaneously if there are no dependencies between them.
S2: ILP is the measure of the number of instructions that can be executed simultaneously.
- S1 is true, S2 is false
- S1 is false, S2 is true
- Both S1 and S2 are true
- Both S1 and S2 are false
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3. Which of the following equations is correct regarding the cycles per instruction (CPI) metric?
- CPI = 1 + stall_rate * stall_penalty
- CPI = 1 – stall_rate * stall_penalty
- CPI = 1 + stall_rate / stall_penalty
- CPI = 1 – stall_rate / stall_penalty
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4. In traditional pipelined processors, pipelining improves performance because it leads to _________pipeline stages which helps to ___________ the clock frequency.
- smaller, decrease
- larger, decrease
- smaller, increase
- larger, increase
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5. Wrong path instructions are defined as the set of instructions after a branch in________ , which are executed if the branch is ___________.
- data dependence order, taken
- data dependence order, not taken
- program order, not taken
- program order, taken
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6. If a 5-stage pipeline with an issue width equal to n experiences no stalls, then the IPC is _______.
- n
- n/2
- n/5
- n-1
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7. In out-of-order processors the execution is done in ____________ order where the instruction is always executed after the _________ instruction.
- program, consumer, producer
- data dependence, producer, consumer
- data dependence, consumer, producer
- program, producer, consumer
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8. Given a program with n instructions and n/5 branches. Assume that our processor can predict any given branch correctly with probability p, then probability of predicting all the branches correctly is _____________.
- (p)n/5
- (1-p)n/5
- (p)n
- (1 – p)n
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9. Which of the following is not a component of an instruction?
- An opcode
- IDs of registers
- Constants
- Control signals
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10. In a 5-stage pipeline, we stand to lose ________ successive cycle(s) after fetching a taken branch.
- 1
- 2
- 5
- 4
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