重庆大学操作系统全英文期末考试题-带答案.docVIP

XX大学2011 ——2012 学年第一学期 《 操作系统 》期末考试试题（A） 考试注意事项 考试 课程 考试时间 年 月 日 题号 一 二 三 四 五 六 七 八 总分 满分 得分 阅卷 教师 选择题（20分，每题1分） 1. Generally speaking, which one is not the major concern for a operating system in the following four options?( D ) A.Manage the computer B.Manage the system resources C.Design and apply the interface between users program and computer hardware system D.High-level programming language complier The main disadvantage of batch system is ( C ) CPU utilization is low Can not concurrent Lack of interaction Low degree of automation  A process transforms from waiting state to ready state is caused by the ( B ) Interrupt event Process scheduling Create a process for a program Waiting for some events The concurrent process is refers to ( C ) The process can be run in parallel The process can be run in order The process can be run in the same time The process can not be interrupted In multi-process system, in order to ensure the integrity of public variables, the processes should be mutually exclusive access to critical areas. The so-called critical area is ( D ) A buffer A date area Synchronization mechanism A program The orderly use of resources allocation strategy can destroy the condition ( D ) to avoid deadlock. Mutual exclusive Hold and wait No preemption Circular wait Users applications use the system resources to complete its operation by the support and services of ( C ) clicking the mouse Keyboard command System call Graphical user interface There are four jobs arrived at the same time and the execution time of each job is 2h. Now they run on one processor at single channel,then the average turnaround time is ( B ) A.1h B.5h C.2.5h D.8h Among the job scheduling algorithms, ( B ) is related to the jobs estimated running time. FCFS scheduling algorithm Short-job-first scheduling algorithm High response ratio algorithm Balanced scheduling In memory management, the purpose of using th