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Welcome to the 80286 80287 Microprocessor MCQs Page

Dive deep into the fascinating world of 80286 80287 Microprocessor with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of 80286 80287 Microprocessor, a crucial aspect of Microprocessor. In this section, you will encounter a diverse range of MCQs that cover various aspects of 80286 80287 Microprocessor, from the basic principles to advanced topics. Each question is thoughtfully crafted to challenge your knowledge and deepen your understanding of this critical subcategory within Microprocessor.

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80286 80287 Microprocessor MCQs | Page 10 of 19

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Q91.
The task privilege level at the instant of execution is called

a.

Descriptor privilege level (DPL)

b.

Current privilege level (CPL)

c.

Effective privilege level (EPL)

d.

None of the mentioned

Discuss
Answer: (b).Current privilege level (CPL)
Q92.
Once the CPL is selected, it can be changed by

a.

hold

b.

transferring control using system descriptors

c.

transferring control using gate descriptors

d.

transferring control using interrupt descriptors

Discuss
Answer: (c).transferring control using gate descriptors
Q93.
The data segments defined in GDT (global descriptor table) and the LDT (local descriptor table) can be accessed by a task with

a.

privilege level 0

b.

privilege level 1

c.

privilege level 2

d.

privilege level 3

Discuss
Answer: (a).privilege level 0
Q94.
A task with privilege level 0, doesn’t refer to all the lower level privilege descriptors in

a.

GDT (global descriptor table)

b.

LDT (local descriptor table)

c.

IDT (interrupt descriptor table)

d.

None of the mentioned

Discuss
Answer: (b).LDT (local descriptor table)
Q95.
The selector RPL that uses a less trusted privilege than the current privilege level for further use is known as

a.

Least task privilege level

b.

Descriptor privilege level

c.

Effective privilege level

d.

None of the mentioned

Discuss
Answer: (c).Effective privilege level
Q96.
The effective privilege level is

a.

maximum numeric of RPL and CPL

b.

minimum privilege of RPL and CPL

c.

numeric minimum and privilege maximum of RPL and CPL

d.

none of the mentioned

Discuss
Answer: (c).numeric minimum and privilege maximum of RPL and CPL
Q97.
The task requesting an access to a descriptor is allowed to access after checking the

a.

type of descriptor

b.

privilege level

c.

type of descriptor and privilege level

d.

corresponding segment

Discuss
Answer: (c).type of descriptor and privilege level
Q98.
A CALL instruction can reference only a code segment descriptor with

a.

DPL less privilege than CPL

b.

DPL equal privilege to CPL

c.

DPL greater privilege than CPL

d.

All of the mentioned

Discuss
Answer: (b).DPL equal privilege to CPL
Q99.
The RPL of a selector that referred to the code descriptor must have

a.

less privilege than CPL

b.

greater privilege than CPL

c.

equal privilege than CPL

d.

any privilege regarding CPL

Discuss
Answer: (c).equal privilege than CPL
Q100.
The instruction that refers to only code segment descriptors with DPL equal to or less than the task CPL is

a.

CALL

b.

IRET

c.

ESC

d.

RET and IRET

Discuss
Answer: (d).RET and IRET
Page 10 of 19

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