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Which of the following are real-time systems?
1. An on-line railway reservation system ,
2. A process control system
3. Aircraft control system
4. Payroll processing system
  • a)
    1 and 2
  • b)
    3 and 4
  • c)
    2 and 3
  • d)
    1,2, 3 and 4
Correct answer is option 'C'. Can you explain this answer?
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Which of the following are real-time systems?1. An on-line railway res...
Real-time system are very fast and quick respondents systems. Response time of such systems is very low, to the tune of 10 ms or 100 ms or even less.
  • Such systems are used where real-life scenario are being implemented like missile system, aircraft system extra.
  • In process control system, the time quantum in reality is very less (to give a feel of multiprocessing so real time system is needed.
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Which of the following are real-time systems?1. An on-line railway res...
Real-time Systems

Real-time systems are those systems in which the time required to provide a response to an input is very small and predictable. It is different from other systems where the response time is not critical.

Examples of Real-time Systems

1. On-line Railway Reservation System: This system is used to provide railway tickets to the customers. It is a real-time system because the response time to provide the ticket is very short and predictable.

2. Aircraft Control System: This system is used to control the movement of an aircraft. It is a real-time system because the response time to control the aircraft is very short and predictable.

3. Process Control System: This system is used to control the industrial processes such as manufacturing, chemical production, etc. It is a real-time system because the response time to control the process is very short and predictable.

4. Payroll Processing System: This system is used to calculate and process the salaries of the employees. It is not a real-time system because the response time to calculate the salaries is not critical.

Therefore, the correct option is C, i.e., 2 and 3 are real-time systems.
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In a general purpose computer system the CPU, the main memory and the cache may be interconnected via one or more shared system bus(es). However, input/output devices (eg. Hard disk, network interfaces) may only be connected to the system bus through an I/O controller. The following are four statements regarding the requirement for an I/O controller.1. The capacities of I/O devices are magnitude order larger than that of main memory and hence direct interfacing is impossible.2. The response times of I/O devices are magnitude order slower than that of CPU and hence direct interfacing is impossible.3. It is always better to off load the I/O processing to a secondary processor on the I/O controller board then to depend on the primary CPU for I/O processing.4. The variety of I/O devices in the market requires that a separate I/O controller exist for each device.Q. What statement(s) best explain the requirement for an I/O controller?

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Which of the following are real-time systems?1. An on-line railway reservation system ,2. A process control system3. Aircraft control system4. Payroll processing systema)1 and 2b)3 and 4c)2 and 3d)1,2, 3 and 4Correct answer is option 'C'. Can you explain this answer?
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