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OMG OMG-OCRES-I200 Exam Syllabus Topics:

OMG-Certified Real-time and Embedded Systems Specialist Intermediate Sample Questions:

1. What two actions must occur in systems that use overlaying with a disk drive backing store? (Choose
two.)

A) Only data is stored on the disk and code is stored in RAM.
B) The operating system must prevent each task in RAM from accessing RAM outside the area reserved
for it.
C) A task executing in RAM can also execute code that is stored on the disk.
D) The code for the currently executing tasks is stored in RAM and that for the currently inactive tasks is
stored on the disk, as managed by the operating system.

2. POSIX -----------------------

A) is the same as UNIX
B) is not designed for real-time systems
C) does not support asynchronous I/O
D) is an operating system interface standard

3. In the Lightweight Time Service, a value of type "TimeT" indicates--------------

A) a relative time, with the "tv_sec" field containing the number of elapsed seconds, and "tv_usec"
containing elapsed microseconds
B) the number of seconds (tv_sec) and nanoseconds (tv_nsec) passed since the beginning of the POSIX
epoch
C) a 64-bit value of relative elapsed or absolute time, in units of 100 nanoseconds
D) the number of seconds passed sincemidnight, January 1, 1970, UTC

4. As the clock tick period is reduced, which two statements are true? (Choose two.)

A) Timer and clock resolution is decreased.
B) The available time for processing tasks is reduced.
C) Task reaction time jitter is reduced.
D) Context switch times are reduced.

5. What two results occur by changing priorities dynamically? (Choose two.)

A) Increases overhead
B) Reduces overhead
C) Avoids the need for priority queues
D) May starve lower priority tasks

Solutions: