操作系統(tǒng)習(xí)題(英文版)

1、Chapter 1 -Computer Systems OverviewTrue / False Questions:T / F -The operat ing system acts as an in terface betwee n the computer hardware and the huma n user.T / F -One of the processor s main functions is to exchange data with memory.T / F -User-visible registers are typically accessible to syst

2、em programs but are not typically available to applicati on programs.T / F -Data registers are general purpose in nature, but may be restricted to specific tasks such as perform ing float in g-po int operati ons.T / F -The Program Status Word contains status information in the form of con diti on co

3、des, which are bits typically set by the programmer as a result of program operati on.T / F -The processing required for a single instruction on a typical computer system is called the Execute Cycle.T / F -A fetched instruction is normally loaded into the Instruction Register (IR).T / F -An interrup

4、t is a mechanism used by system modules to signal the processor that no rmal process ing should be temporarily suspe nded.T / F -To accommodate interrupts, an extra fetch cycle is added to the in structi on cycle.T / F -The minimum information that must be saved before the processor tran sfers con t

5、rol to the in terrupt han dler routi ne is the program status word (PSW) and the locati on of the curre nt in structio n.T / F -One approach to dealing with multiple interrupts is to disable all in terrupts while an in terrupt is being processed.T / F -Multiprogramming allows the processor to make u

6、se of idle time caused by Ion g-wait in terrupt han dli ng.T / F Tn a two-level memory hierarchy, the Hit Ratio is defined as the fracti on of all memory accesses found in the slower memory.T / F -Cache memory exploits the principle of locality by providing a small, fast memory betwee n the processo

7、r and mai n memory.T / F T n cache memory design, block size refers to the unit of data excha nged betwee n cache and main memoryT / F -The primary problem with programmed I/O is that the processor must wait for the I/O module to become ready and must repeatedly in terrogate the status of the I/O mo

8、dule while wait ing.Multiple Choice Questi ons:The general role of an operating system is to:Act as an in terface betwee n various computersProvide a set of services to system usersMan age files for applicati on programsNone of the aboveThe four main structural elements of a computer system are:a. P

9、rocessor, Registers, I/O Modules & Main Memory b. Processor, Registers, Main Memory & System Bus c. Processor, Main Memory, I/O Modules & System Bus d. None of the aboveThe two basic types of processor registers are:User-visible and Control/Status registersControl and Status registersUser-visible an

10、d user-invisible registersNone of the aboveAddress registers may contain:Memory addresses of dataMemory addresses of instructionsPartial memory addressesAll of the aboveA Control/Status register that contains the address of the next instruction to be fetched is called the:Instruction Register (IR)Pr

11、ogram Counter (PC)Program Status Word (PSW)All of the aboveThe two basic steps used by the processor in instruction processing are:Fetch and Instruction cyclesInstruction and Execute cyclesFetch and Execute cyclesNone of the aboveA fetched instruction is normally loaded into the:Instruction Register

12、 (IR)Program Counter (PC)Accumulator (AC)None of the aboveA common class of interrupts is:ProgramTimerI/OAll of the aboveWhen an external device becomes ready to be serviced by the processor, the device sends this type of signal to the processor:Interrupt signalHalt signalHandler signalNone of the a

13、boveInformation that must be saved prior to the processor transferring control to the interrupt handler routine includes:Processor Status Word (PSW)Processor Status Word (PSW) & Location of next instructionProcessor Status Word (PSW) & Contents of processor registersNone of the aboveOne accepted met

14、hod of dealing with multiple interrupts is to:Define priorities for the interruptsDisable all interrupts except those of highest priorityService them in round-robin fashionNone of the aboveIn a uniprocessor system, multiprogramming increases processor efficiency by:Increasing processor speedTaking a

15、dvantage of time wasted by long wait interrupt handlingEliminating all idle processor cyclesAll of the aboveAs one proceeds down the memory hierarchy (i.e., from inboard memory to offline storage), the following condition(s) apply:Increasing cost per bitDecreasing capacityIncreasing access time d. A

16、ll of the aboveSmall, fast memory located between the processor and main memory is called:WORM memoryCache memoryCD-RW memoryNone of the aboveWhen a new block of data is written into cache memory, the following determines which cache location the block will occupy:Block sizeCache sizeWrite policyNon

17、e of the aboveDirect Memory Access (DMA) operations require the following information from the processor:Address of I/O deviceStarting memory location to read from or write toNumber of words to be read or writtenAll of the aboveQuestions， 1.4， 1.7， 1.8Problems， 1.3， 1.4， 1.5， 1.7Chapter 2 -Operati n

18、g System OverviewTrue / False Questions:T / F -An operati ng system con trols the executi on of applicatio ns and acts as an in terface betwee n applicati ons and the computer hardware.T / F -The operati ng system mai ntai ns in formatio n that can be used for billi ng purposes on multi-user systems

19、.T / F -The operating system typically runs in parallel with application programs, on it s own special O/S processor.T / F -One of the driving forces in operating system evolution is adva nceme nt in the un derly ing hardware tech no logy.T / F Tn the first computers, users in teracted directly with

20、 the hardware and operat ing systems did not exist.T / F Tn a batch-processing system, the phrasecontrol is passed to a jobmea ns that the processor is now fetchi ng and executi ng in structio ns in a user program.T / F -Un iprogram ming typically provides better utilizati on of system resources tha

21、 n multiprogram ming.T / F Tn a time sharing system, a user s program is preempted at regularin tervals, but due to relatively slow huma n react ion time this occurre nce is usually tran spare nt to the user.T / F -A process can be defined as a unit of activity characterized by a single seque ntial

22、thread of executi on, a curre nt state, and an associated set of system resources.T / F -A virtual memory address typically con sists of a page nu mber and an offset with in the page.T / F Tmpleme nting priority levels is a com mon strategy for short-term scheduli ng, which invo Ives assig ning each

23、 process in the queue to the processor accordi ng to its level of importa nee.T / F -Complex operat ing systems today typically con sist of a few thousa nd lines of in structi ons.T / F -A mono lithic kernel architecture assig ns only a few esse ntial fun cti ons to the kern el, i ncludi ng address

24、spaces, in terprocess com muni cati on and basic scheduli ng.T / F -The hardware abstracti on layer (HAL) maps betwee n gen eric hardware comma nds/resp on ses and those unique to a specific platform.Multiple Choice Questi ons:A primary objective of an operat ing system is:ConvenienceEfficiencyAbili

25、ty to evolveAll of the aboveThe operating system provides many types of services to end-users, programmers and system desig ners, in clud ing:Built-in user applicationsError detect ion and resp onseRelational database capabilities with the internal file systemAll of the aboveThe operating system is

26、unusual n it s role as a control mechanism, in that:It runs on a special processor, completely separated from the rest of the systemIt frequently relinquishes control of the system processor and must depend on the processor to regain control of the systemIt never relinquishes control of the system p

27、rocessorNone of the aboveOperating systems must evolve over time because:Hardware must be replaced when it failsUsers will only purchase software that has a current copyright dateNew hardware is designed and implemented in the computer systemAll of the aboveA major problem with early serial processi

28、ng systems was:Setup timeLack of input devicesInability to get hardcopy outputAll of the aboveAn example of a hardware feature that is desirable in a batch-processing system is:Privileged instructionsA completely accessible memory areaLarge clock cyclesNone of the aboveA computer hardware feature th

29、at is vital to the effective operation of a multiprogramming operating system is:Very large memoryMultiple processorsI/O interrupts and DMAAll of the aboveThe principle objective of a time sharing, multiprogramming system is to:Maximize response timeMaximize processor useProvide exclusive access to

30、hardwareNone of the aboveWhich of the following major line of computer system development created problems in timing and synchronization that contributed to the development of the concept of the process?Multiprogramming batch operation systemsTime sharing systemsReal time transaction systemsAll of the