The 80386 can run in three different modes: the real mode, the protected mode, and a virtual mode. In real mode, the size of each segment is limited to 64 Kbytes and in protected mode, the largest segment size is increased to 4 Gbytes and the virtual mode is a special version of the protected mode.
22. How many bit flag registers does 80386 have?
A. 8
B. 16
C. 32
D. 64
Answer: c
The 32-bit flag register possesses the normal carry zero, auxiliary carry, parity, sign, and overflow flags.
23. Which processor is the derivative of 80386DX?
A. 80387
B. 80386SX
C. 80386 DDX
D. 8087
Answer: b
The derivative of the 80386DX is called the 80386SX which provides the same architecture and lowers cost. To minimize the cost value, it uses an external 16-bit data bus and a 24-bit memory bus.
24. Which of the following is a portable device of Intel?
A. 80386DX
B. 8087
C. 80386SL
D. 80386SX
Answer: c
Intel has 80386SL as the portable PC which helps in controlling power and increases the power efficiency of the processor.
25. Which of the processor has a 5 stage pipeline?
A. 80386
B. 80486
C. 80286
D. 80386DX
Answer: b
80486 has a five-stage pipeline ALU. These include fetch, decode, execute, memory access, and write back. This helps in accessing instruction faster and thus makes the processor faster. 80386DX has a three-stage pipelining which only includes fetching, decoding and execution.
26. Which of the following processor can execute two instructions per cycle?
A. 80486
B. 80386DX
C. Intel Pentium
D. 80386
Answer: c
Intel Pentium has many advanced features one of which is, that it can execute two instructions per cycle thus improving the speed of the processor whereas 80486, 80386, and 80386DX do not have this feature.
27. Which of the following processors have two five-stage pipelines?
A. 80486
B. 80386
C. Intel Pentium
D. 80386DX
Answer: c
The intel Pentium possess two five-stage pipelines which allow the execution of two integer instruction jointly.
28. In which processor does the control register and system management mode register first appeared?
A. 80386
B. 80386SL
C. 80386DX
D. 80486
Answer: b
The control register and system management mode register first appeared in 80386SL and were later on succeeded by other processors. These registers can provide intelligent power control.
29. Which is the next successor of Intel Pentium?
A. Pentium pro
B. P1
C. P2
D. P5
Answer: a
Intel Pentium is succeeded by Pentium pro. P1, P2, and P5 are the other processors of Intel.
30. Which of the following processor allows a multiple branch prediction?
A. 80386
B. P1
C. Intel Pentium
D. Intel Pentium pro
Answer: d
A branch instruction can change the program flow and multiple branch prediction allows the continuous execution of instructions based on assumptions. This can eliminate delay and thus speeds up the execution.
