1. For MEMR(active low) and MEMWR(active low) operations the mode of isolation buffer should respectively be in
a) receiver mode, receiver mode
b) transmit mode, receiver mode
c) receiver mode, transmit mode
d) transmit mode, transmit mode
Explanation: During MEMR(active low) the data flow from memory to CPU so isolation buffer should be in receiver mode and data flows from CPU to memory during MEMWR(active low) operation and so buffer should be in transmit mode.
2.If the DIR pin of the isolation chip is high, then it enters into
a) receiver mode
b) virtual access mode
c) transmit or receive mode
d) transmit mode
Explanation: If the DIR pin of the isolation chip is high, then it enters into transmit mode and if it is 0 then the isolation chip enters into receiver mode.
3. The complete software system is divided into
a) main program
b) Interrupt routine IRT2 for first subprocessing the unit
c) Interrupt routine IRT3 for first subprocessing the unit
d) all of the mentioned
Explanation: System software of the complete system consists of three parts. the first part main control program controls the total operation of the system, and the remaining two parts are the small local initialization programs for each of the subprocessors
4. The 80286 is able to address the physical memory of
a) 8 MB
b) 16 MB
c) 24 MB
d) 64 MB
Explanation: The 80286 with its 24-bit address bus is able to address 16 Mbytes of physical memory.
5. 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
Explanation: Various versions of 80286 are available that run on 12.5 MHz, 10 MHz and 8 MHz clock frequencies.
6. 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
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.
7.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
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.
8. 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
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.
9. 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
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.
10. Memory management deals with
a) data protection
b) unauthorized access prevention
c) segmented memory
d) all of the mentioned
Explanation: The important aspects of memory management are data protection, unauthorized access prevention, and segmented memory.