1
GATE CSE 1992
MCQ (Single Correct Answer)
+2
-0.6
At a particular time of computation the value of a counting semaphore is 7. Then 20 P operations and 15 V operations were completed on this semaphore. The resulting value of the semaphore is:
A
42
B
2
C
7
D
12
2
GATE CSE 1992
MCQ (Single Correct Answer)
+2
-0.6
Which of the following is an example of a spooled device?
A
The terminal used to the input data for a program being executed.
B
The secondary memory device in a virtual memory system.
C
A line printer used to print the output of a number of jobs.
D
None of the above.
3
GATE CSE 1992
True or False
+1
-0
Which of the following statements is / are true / false?

Union of two recursive languages is recursive

A
TRUE
B
FALSE
4
GATE CSE 1992
True or False
+1
-0
Which of the following statements is / are true / false?

Regular languages are closed under infinite union.

A
TRUE
B
FALSE