GATE 2019 - Computer Organization Quiz-2 ( ALU )

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Question 1

Consider the following sequence of micro-operations:
MBR←PC
PC←Y+PC
Mem←MBR
The addressing mode and operation depicted are respectively

• ADirect and instruction fetch
• BIndirect and jump
• CImmediate and operand fetch
• DPC relative and jump

Question 2

What is the use of TDO pin of PCI.

• ATo serially shift instruction and data out of device.
• BTo serially shift instruction and data into device.
• CUsed to control state of test access part.
• DNone.

Question 3

Which of the following is correct defines the microprogram?

• AAny source program run on micro computers
• BAny program of a very small size
• CAny set of instructions for primitive operations in a system
• DA general name for ‘macro’ used in assemble language programming

Question 4

Three computers use register windows with the following characteristics. Determine the total number of registers in computer 3 is.

• A48
• B528
• C138
• D64

Question 5

_______ is used to choose between incrementing the PC or Performing ALU operations.

• AMULTIPLEXER
• BCONTROL UNIT
• CDATA BUS
• DCONDITIONAL CODES

Question 6

Consider the ALU shown below.

If the operands are in 2’s complement representation, which of the following operations can be perforModerate by suitably setting the control lines K and C0 only (+ and – denote addition and subtraction respectively)?

• AA + B, and A - B, but not A + 1
• BA + B, and A + 1, but not A – B
• CA + B, but not A – B or A + 1
• DA + B, and A - B, and A + 1

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