This set of Microprocessor Multiple Choice Questions & Answers (MCQs) focuses on “Salient Features of 80286”.
1. The 80286 is able to address the physical memory of
a) 8 MB
b) 16 MB
c) 24 MB
d) 64 MB
View Answer
Explanation: The 80286 with its 24-bit address bus is able to address 16 Mbytes of physical memory.
2. The 80286 is able to operate with the clock frequency of
a) 12.5 MHz
b) 10 MHz
c) 8 MHz
d) all of the mentioned
View Answer
Explanation: Various versions of 80286 are available that run on 12.5 MHz, 10 MHz and 8 MHz clock frequencies.
3. The management of the memory system required to ensure the smooth execution of the running process is done by
a) control unit
b) memory
c) memory management unit
d) bus interface unit
View Answer
Explanation: The memory management which is an important task of the operating system is now supported by a hardware unit called a memory management unit.
4. The fetching of the program from secondary memory to place it in physical memory, during the execution of CPU is called
a) mapping
b) swapping in
c) swapping out
d) pipelining
View Answer
Explanation: Whenever the portion of a program is required for execution by the CPU, it is fetched from the secondary memory and placed in the physical memory. This is called swapping in of the program.
5. The process of making the physical memory free by storing the portion of program and partial results in the secondary storage called
a) mapping
b) swapping in
c) swapping out
d) pipelining
View Answer
Explanation: In swapping out, a portion of the program or important partial results required for further execution, may be saved back on secondary storage to make the physical memory free, for further execution of another required portion of the program.
6. The memory that is considered as a large logical memory space, that is not available physically is
a) logical memory
b) auxiliary memory
c) imaginary memory
d) virtual memory
View Answer
Explanation: To the user, there exists a very large logical memory space, which is actually not available called virtual memory. This does not exist physically in a system. It is however, possible to map a large virtual memory space onto the real physical memory.
7. Memory management deals with
a) data protection
b) unauthorized access prevention
c) segmented memory
d) all of the mentioned
View Answer
Explanation: The important aspects of memory management are data protection, unauthorized access prevention, and segmented memory.
8. The memory management and protection mechanisms are disabled when the 80286 is operated in
a) normal mode
b) real address mode
c) virtual address mode
d) all of the mentioned
View Answer
Explanation: In real address mode of 80286, all the memory management and protection mechanisms are disabled.
9. The memory management and protection mechanisms are enabled with advanced instruction set when 80286 is operated in
a) normal mode
b) real address mode
c) virtual address mode
d) all of the mentioned
View Answer
Explanation: In virtual address mode, 80286 works with all of its memory management and protection capabilities, with the advanced instruction set.
10. The 80286 is an upward object code compatible with 8086 or 8088 when operated in
a) normal mode
b) real address mode
c) virtual address mode
d) real and virtual address mode
View Answer
Explanation: The 80286 is operated in two modes, namely real address mode and virtual address mode. In both the modes, the 80286 is compatible with 8086/8088.
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