Q. System calls are usually invoked by using

1) An indirect jump
2) A software interrupt
3) Polling
4) A privileged instruction

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Q. Which of the following holds data and processing instructions temporarily until the CPU needs it??

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Q. Which of the following register processors used for fetch and execute operations?
1) Program counter
2) Instruction register
3) Address register

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Q. Microinstruction length is determined by ………………..

1) The maximum number of simultaneous micro-operations that must be specified
2) The way in which the control information is represented or encoded
3) The way in which the next microinstruction address is specified

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Q. ID catching system, the memory reference made in any short time integral tends to use only a small fraction of the total memory?

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Q. The word length of a CPU is defined as

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Q. The register which holds the address of the locating to or from which data are to be transferred is known as

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Q. Which one is required while establishing the communication link between CPU and peripherals?

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Q. Which of the following data transfer modes takes relatively more time?

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Q. Halt operation comes under ………

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Q. The CPU initializes the DMA by sending ………

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Q. In four – address instruction format, the number of bytes required to encode an instruction is (assume each address requires 24 bits, and 1 byte is required for operation code)

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Q. The minimum time delay between the initiations of two independent memory operations is called

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Q. Consider an algebraic system (A,*), where A is a set of all non-zero real numbers and * is a binary operation defined by A* b = ab/4 then (G*) is a

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Q. A 2 level memory has an average access time of 30 ns with cache and memory access time as 20 ns and 150 ns respectively. What is the hit ratio?

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Q. The following are some of the sequences of operations in the instruction cycle, which one is the correct sequence?

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Q. Horizontal micro construction has which of the following attributes?
1) Short formats
2) Limited ability to express parallel micro-operations
3) Considerable encoding of the control information

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Q. The register which keeps track of the execution of a program and which contains the memory address of the instruction currently being executed is known as …………

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Q. Consider the following situation and fill in the blanks:

The computer starts the tape moving by issuing a command; the processor then monitors the status of the taps by means of a ………….. When the tape is in the correct position, the Processor issues a ……………

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Q. For interval arithmetic best rounding technique use is ………..

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