80286 Microprocessor Question & Answers December 30, 2022 By WatElectronics This article lists 100 80286 Microprocessor MCQs for engineering students. All the 80286 Microprocessor Questions & Answers given below include a hint and a link wherever possible to the relevant topic. This is helpful for users who are preparing for their exams, interviews, or professionals who would like to brush up on the fundamentals of the 80286 Microprocessor. The 80286-microprocessor introduced in 1982, is a 16-bit microprocessor like the 8086. The two-mode operation, more addressable memory, and virtual memory in protected mode are the salient features of the 80286 microprocessor. The real address mode 80286 acts as a faster version of microprocessor 8086 and the program for 8086 can be executed without modifications in 80286. In protected virtual address mode, the 80286 is able to run several programs and supports multitasking. The address unit, bus unit, instruction unit, & execution unit are the functional parts of the 80286 microprocessor whereas 8086 has only two functional parts. The 80286 CPU contains almost the same set of registers as microprocessor 8086 such as eight 16-bit general purpose registers, four 16-bit segment registers, instruction pointer, status, and control register. The interrupts of 808286 may be divided into three categories such as external or hardware interrupts, INT instruction or software interrupts, and interrupts generated internally by exceptions. The SMSW and LMSW instructions available in 80286 instructions set to write & read the machine status flag in real address mode. The nested task flag, privilege field, protection enable, monitor processor extension, and processor extension evaluator are the additional fields available in 80286 flag registers. 1). What is the standard form of LAR? Load Access Rights Load Access Regulator Line Access Rights None of the above None Hint 2). In which one of the following is not a function unit of 80286? Bus unit Paging unit Execute unit Address unit None Hint 3). In which one of the following processors, the barrel shifter is absent? 80486 80286 Pentium None of the above None Hint 4). Which one of the following registers used for holding data? General purpose register Accumulator Base register Count register None Hint 5). Which one of the following contains the instruction being executed? Memory address register Instruction registers Memory buffer register None of the above None Hint 6). The instruction register come under ______________ register? Control and status registers User visible registers Both a and b None of the above None Hint 7). The maximum memory access of 80286 microprocessor in real mode is ________________? 1M 16M 20M 45M None Hint 8). Which one of the following descriptors used to store trap gates? Data segment descriptors Gate segment descriptors Interrupt descriptors None of the above None Hint 9). Which one of the following descriptor table have only one copy in system? LDT GDT Both a and b None of the above None Hint 10). What is the standard form of CLTS? Clear Task Single Flag Clear Task Simple Flag Clear Task Switched Flag None of the above None Hint 11). What is the standard form of STD? Set Define Flag Set Direction Flag Set Device Flag None of the above None Hint 12). The isolation of system software from user application is a type of protection in the _____________ processor? 80486 80286 Pentium None of the above None Hint 13). Which one of the following comes under real data transfer instruction? FLD, FST FILD FBLD None of the above None Hint 14). An interrupt number is ____________ for valid opcode exception function of 80286 int vector assignment (real address mode)? One Zero Two Six None Hint 15). What is the standard form of RCR? Rotate Through Carry Right Byte or Word Right Through Carry Rotate Byte or Word Right Through Carry Right Byte or Word Rotate Through Carry Rotate Byte or Word None of the above None Hint 16). Which one of the following comes under high level instruction? ENTER LMSW SMSW None of the above None Hint 17). _______________ are the operation types for intersegment within the same privilege level? JUMP, CALL RET, IRET Both a and b None of the above None Hint 18). Which one of the following is an operand for ARPL instruction? Selector, register Selector Register None of the above None Hint 19). The register selector is an operand for ____________________ instruction? ARPL VERR LSL None of the above None Hint 20). What is the standard form of ARPL? Adjust Regulator Privilege Level Adjust Request Privilege Level Adjust Request Primary Level None of the above None Hint 21). The maximum memory access of 80286 microprocessor in protected mode is ________________? 1M 16M 20M 45M None Hint 22). What is the standard form of LIDT? Load the Interrupt Descriptor Table Load the Internal Descriptor Table Load the Interrupt Device Table None of the above None Hint 23). How many functional parts does 80286 consists? Two Four Eight Ten None Hint 24). The address, bus, instruction, and execution unit are the functional parts of 80286 Four 16 bits Two 16 bits Three 16 bits Six 16 bits None Hint 25). How many general-purpose registers do 80286 CPU contains? Four 16 bits Eight 16 bits Three 16 bits Six 16 bits None Hint 80286 Microprocessor MCQ for Exams 26). In protected virtual address mode, the 80286 microprocessors can address up to _______________ memory? 8 GB of virtual memory 64 GB of virtual memory 4 GB of virtual memory 1 GB of virtual memory None Hint 27). Which one of the following is 80286 salient features? Two modes of operation More addressable memory Both a and b None of the above None Hint 28). What is the standard form of PLCC? Pin Leaded Chip Carrier Plastic Leaded Chip Carrier Plastic Leaded Control Carrier None of the above None Hint 29). What is the standard form of SGDT? Store the Global Descriptor Table Register Sign the Global Define Table Register Set the Global Diffusion Table Register None of the above None Hint 30). What is the standard form of VERW? Verify for ROM Access Verify for RAM Access Verify for Read Access None of the above None Hint 31). Which one of the following comes under real integer transfer instruction? FLD, FST FILD FBLD None of the above None Hint 32). Which one of the following is a feature of 80286? Multiuser Multitasking OS All of the above None Hint 33). If operand is equal A, then that algorithm comes under _______________ addressing mode? Direct Indirect Immediate Register None Hint 34). Which one of the following algorithms comes under base with index and displacement addressing mode? LA=R LA=(SR)+A LA=(SR)+(B) LA=(SR)+(B)+(I)+A None Hint 35). What is the standard form of EM? Phase Extension Emulator Processor Emulator Extension Processor Extension Emulator None of the above None Hint 36). Which one of the following comes under 80286 flag register? Monitor Processor Extension Processor Extension Emulator Task Switch All of the above None Hint 37). The interrupts generated internally by exceptions is one of the interrupts of _________________ microprocessor? 80386 80286 8086 80486 None Hint 38). What is the standard form of LCC? Leaded Chip Carrier Leadless Chip Carrier Leadless Control Carrier None of the above None Hint 39). What is the standard form of LDGT? Load the Global Descriptor Table Register Load the Global Define Table Register Load the Global Diffusion Table Register None of the above None Hint 40). The memory size of an 80286 microprocessor is __________________? 12 M 16 M 20 M 30 M None Hint 41). Which one of the following registers used for all string manipulation? General purpose register Accumulator Base register Count register None Hint 42). Which one of the following contains the address of the next memory access? Memory address register Instruction registers Memory buffer register None of the above None Hint 43). Which one of the following is a lowest privilege level? 01-OS services 10-OS extensions 00-kernel levels 11-applications None Hint 44). What is the standard form of REPNE/REPNZ? Repeat While Not Equal/Not Zero Repeat While Equal/Zero Repeat Not Zero None of the above None Hint 45). What is the standard form of SIDT? Sign the Interrupt Descriptor Table Store the Internal Descriptor Table Simple the Interrupt Device Table None of the above None Hint 46). If EA is equal to A, then that algorithm comes under _______________ addressing mode? Direct Indirect Immediate Register None Hint 47). Which one of the following algorithms comes under base with displacement addressing mode? LA=R LA=(SR)+A LA=(SR)+(B) LA=(SR)+(B)+A None Hint 48). What is the standard form of IOPL? I/O Phase Field I/O Privilege Field I/O Primary Field None of the above None Hint 49). What is the standard form of SLDT? Set the Local Define Table Register Store the Local Descriptor Table Register Sign the Local Descriptor Table Register None of the above None Hint 50). The data bus width of an 80286 microprocessor is __________________? 12 bits 16 bits 20 M bits 30 bits None Hint 80286 Microprocessor MCQ for Quiz 51). Which one of the following is a suitable coprocessor of 80286? 80287 80387 80386 None of the above None Hint 52). What is the standard form of LLDT? Load the Local Define Table Register Load the Line Descriptor Table Register Load the Local Descriptor Table Register None of the above None Hint 53). In real address mode, the 80286 microprocessors can address up to _______________ memory? 1 MB of physical memory 64 GB of virtual memory 4 GB of virtual memory 1 GB of virtual memory None Hint 54). If EA is equal to A+(R), then that algorithm comes under _______________ addressing mode? Displacement Indirect Immediate Register None Hint 55). Which one of the following algorithms comes under base addressing mode? LA=R LA=(SR)+A LA=(SR)+(B) LA=(SR)+(B)+A None Hint 56). The segment has not been accessed is the function of _________________? Readable Accessed Conforming Executable None Hint 57). The code segment may not be read is the function of _______________? Readable Accessed Conforming Executable None Hint 58). The data segment may not be written into and data segment may be written into is the function of ________________? Readable Accessed Conforming Writable None Hint 59). What is the standard form of PGA? Phase Grid Array Plastic Grid Array Pin Grid Array None of the above None Hint 60). The address bus width of an 80286 microprocessor is __________________? 12 bits 20 bits 30 bits 16 bits None Hint 61). The clock rate of 80286 microprocessor is _________________ Hz? 10-16 20-29 30-40 50-60 None Hint 62). Which one of the following contains the current date fetched from memory? Memory address register Instruction registers Memory buffer register None of the above None Hint 63). What is the standard form of CMC? Complement Carry Flag Common Carry Flag Control Carry Flag None of the above None Hint 64). What is the standard form of LMSW? Load the Machine single Word Load the Machine Simple Word Load the Machine Status Word None of the above None Hint 65). Which one of the following algorithms comes under displacement address? LA=R LA=(SR)+A LA=(SR)+(B) LA=(SR)+(B)+A None Hint 66). The16-bit selector is the value of _______________? Present Destination selector Segment descriptor Destination offset None Hint 67). The base address of special system data segment in real memory is the description of ______________? BASE LIMIT TYPE DPL None Hint 68). The 24-bit number is the value of __________________ field? BASE LIMIT TYPE DPL None Hint 69). Which one of the following algorithms comes under base with scaled index and displacement addressing mode? LA=R LA=(SR)+(I)*S+(B)+A LA=(SR)+(I)*S+A LA=(SR)+(B)+(I)+A None Hint 70). An intel 80286 microprocessor introduced in _______________? 1999 1982 1987 2000 None Hint 71). The number of transistors in 80286 microprocessors are _________________? 10000 15000 1,30,000 1,40,000 None Hint 72). The addressing modes of any processor categorized into __________________ types? Two Three Four None Hint 73). What is the standard form of SAHF? Store AH from Flags Set AH from Files Single AH from Flags None of the above None Hint 74). What is the standard form of CLC? Clear Carry Flag Common Carry Flag Control Carry Flag None Hint 75). If EA is equal to top of stack, then the algorithm comes under _______________ addressing mode? Displacement Stack Register None of the above None Hint 80286 Microprocessor MCQ for Interviews 76). Which one of the following algorithms comes under register operand? LA=R LA=(SR)+A LA=(SR)+(B) LA=(SR)+(B)+A None Hint 77). The figure shown below is a block diagram of _______________? PVAM GDT LDT None of the above None Hint 78). The indicates selector privilege level desired is a function of ________________? Present RPL Segment descriptor Executable None Hint 79). The entry point within the target code segment is the description of _______________? Present RPL Segment descriptor Destination offset None Hint 80). Which one of the following is a 16-bit processor? 80286 80386 Both a and b None of the above None Hint 81). Which one of the following is an 80286-bus cycle type? Interrupt acknowledges Memory read and write Halt All of the above None Hint 82). The figure shown below is a block diagram of _______________? 80286 80486 80386 8086 None Hint 83). The segment is mapped into physical memory is a function of ______________? Present DPL Segment descriptor Executable None Hint 84). The code or data segment descriptor is a function of _______________? Present DPL Segment descriptor Executable None Hint 85). What is the standard form of LAHF? Load AH from Flags Load AH from Files Line AH from Flags None of the above None Hint 86). Which one of the following algorithms comes under scaled index with displacement addressing mode? LA=R LA=(SR)+A LA=(SR)+(I)*S+A LA=(SR)+(B)+(I)+A None Hint 87). Which one of the following is a basic mechanism supports by 80286? Restricted use of segments Restricted accesses to segments Both a and b None of the above None Hint 88). Which one of the following is a function performed in 80286 real address mode operation? Enables interrupts Sets up descriptor tables Initializes the peripheral All of the above None Hint 89). What is the standard form of SMSW? Store the Machine single Word Sign the Machine Simple Word Set the Machine Status Word None of the above None Hint 90). Which one of the following processors consists 68 pins? 80286 80386 80486 None of the above None Hint 91). What is the standard form of CLD? Clear Define Flag Common Direction Flag Clear Direction Flag None of the above None Hint 92). Which one of the following comes under real packed decimal transfer instruction? FLD, FST FILD FBLD None of the above None Hint 93). What is the standard form of STC? Set Carry Flag Simple Carry Flag Single Carry Flag None of the above None Hint 94). An interrupt number is ____________ for divide error exception function of 80286 interrupt vector assignment (real address mode)? One Zero Two Three None Hint 95). Which one of the following comes under processor control instruction? ENTER LMSW LEAVE None of the above None Hint 96). Which one of the following is a highest privilege level? 01-OS services 10-OS extensions 00-kernel levels 11-applications None Hint 97). Which one of the following descriptor tables may not change during execution? LDT GDT Both a and b None of the above None Hint 98). The condition codes come under ______________ register? Control and status registers User visible registers Both a and b None of the above None Hint 99). Which one of the following is a function of bus interface unit? Sends address of the memory I/O It fetches instruction from memory It reads data from part/memory All of the above None Hint 100). Which one of the following is a function unit of 80286? Prefetch unit Paging unit Instruction unit None of the above None Hint Read more about Microprocessor For More MCQs Microprocessor Question & Answers 8085 Microprocessor Question & Answers 8086 Microprocessor Question & Answers 80386 Microprocessor Question & Answers Please fill in the comment box below. Time's up
