A set of standard CPU-intensive, floating points and integers benchmarks are referred to as
Answer: A
Correct answer: SPEC benchmark
SPEC - the Standard Performance Evaluation Corporation - publishes the suites of CPU-intensive integer and floating-point programs used to compare machines. The other three names are not benchmark suites.
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In asymmetric clustering other machines perform operations while one machine is in
Answer: A
Correct answer: hot standby mode
In asymmetric clustering one machine runs the application while the other does nothing but monitor it, ready to take over the instant it fails. A machine kept powered and ready in this way is in hot standby; plain standby would not imply that it is already running and watching.
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Native MIPS has MIPS measurement of
Answer: A
Correct answer: MIPS = Instruction count/(Execution time)10^6
MIPS means millions of instructions per second, so the instruction count is divided by the execution time in seconds and then by 106 to convert to millions:
\[ \text{MIPS}=\frac{\text{Instruction count}}{\text{Execution time}\times 10^{6}} \]
Dividing by 103 would give thousands of instructions per second, and omitting the divisor gives plain instructions per second.
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What is the unit which decodes and translates each instruction and generates the necessary enable signals for ALU and other units called
Answer: B
Correct answer: Control Unit
The control unit fetches each instruction, decodes it, and issues the enable and timing signals that make the ALU, registers and memory carry it out. The ALU performs the operations rather than directing them, and the CPU is the whole of which the control unit is one part.
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Which devices among the following are usually designed on the complex electromechanical principle ?
Answer: B
Correct answer: Peripheral devices
Peripherals - printers, keyboards, disk drives, tape units - are electromechanical and electromagnetic devices of some complexity, in contrast with the purely electronic circuits of the CPU and memory. Printing devices and input devices are both classes of peripheral, so naming either of them alone is too narrow.
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Symmetric multiprocessing architecture of computer system uses shared
Answer: D
Correct answer: both a and b
In symmetric multiprocessing every processor is a peer: all of them run the operating system and all of them reach main memory over the same system bus. So both the bus and the memory are shared. The processors themselves are the things doing the sharing, not a resource that is shared.
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Computer B has an execution time of 110 ns for a program and computer A has an execution time of 1001 ns for the same program. Then
Answer: B
Correct answer: B is 9.1 times as fast as A for programs
The machine with the shorter execution time is the faster one, and the ratio of the times gives the factor:
\[ \frac{1001\ \text{ns}}{110\ \text{ns}}=9.1 \]
B takes 110 ns against A's 1001 ns, so it is B that is 9.1 times as fast, not A.
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When PC having Clock rate of 2 and CPU clock cycle for a program is 4 then Execution time of this computer for a program will be
Answer: D
Correct answer: 2
Execution time is the number of CPU clock cycles divided by the clock rate:
\[ \text{Execution time}=\frac{\text{CPU clock cycles}}{\text{Clock rate}}=\frac{4}{2}=2 \]
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A set of physical addresses is also known as ?
Answer: C
Correct answer: Memory Space
The set of addresses that physically exist in main memory is the memory space; the set of addresses a program may generate is the address space. Keeping the two apart is the basis of virtual memory, where the address space is larger than the memory space.
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The technique helps processor to run a program concurrently with input output operations is ?
Answer: C
Correct answer: Interrupt driven I/O
With interrupt-driven I/O the processor issues the transfer and then continues with other work; the device raises an interrupt when it is ready, so the CPU never sits polling. Programmed I/O ties the processor up in a wait loop, and DMA removes the processor from the transfer altogether rather than letting it run a program concurrently with it.
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