GATE CSE 2001 | Process Concepts and Cpu Scheduling Question 49 | Operating Systems

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GATE CSE 2001

MCQ (Single Correct Answer)

-0.3

A CPU has two modes-privileged and non-privileged. In order to change the mode from privileged to non-privileged

A hardware interrupt is needed

A software interrupt is needed

A privileged instruction (which does not generate an interrupt) is needed.

A non-privileged instruction (which does not generate an interrupt) is needed.

GATE CSE 1999

MCQ (Single Correct Answer)

-0.3

System calls are usually invoked by using:

A software interrupt

Polling

An indirect jump

A privileged instruction

GATE CSE 1998

MCQ (Single Correct Answer)

-0.3

Which of the following is an example of spooled device?

The terminal used to enter the input data for the C program being executed.

An output device used to print the output of a number of jobs.

The secondary memory device in a virtual storage system.

The swapping area on a disk used by the swapper.

GATE CSE 1998

MCQ (Single Correct Answer)

-0.3

Consider $$n$$ processes sharing the $$CPU$$ in a round-robin fashion. Assuming that each process switch takes $$s$$ seconds, what must be the quantum size $$q$$ such that the overhead resulting from process switching is minimized but, at the same time each process is guaranteed to get its turn at the $$CPU$$ at least every $$t$$ seconds?

$$q \le {{t - ns} \over {n - 1}}$$

$$q \ge {{t - ns} \over {n - 1}}$$

$$q \le {{t - ns} \over {n + 1}}$$

$$q \ge {{t - ns} \over {n + 1}}$$

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