Thursday, 17 April 2014

Important Questions For Computer Architecture

Important Questions For Computer Architecture

1-An address used by programmers in a system supporting virtual memory concept is called virtual address and the set of such addresses are called address space.

2-The method for updating the main memory as soon as a word is removed from theCache is called- write-back

3-A control character is sent at the beginning as well as at the end of each block in the
synchronous-transmission in order to-Supply information needed to separate the incoming bits into individual character.

4-In a non-vectored interrupt, the address of interrupt service routine is -Assigned to a fixed memory location.

5-Divide overflow is generated when-Sign of the dividend is same as that of divisor.

6-Which method is used for resolving data dependency conflict by the compiler Itself-Delayed load.

7-Stack overflow causes-Internal interrupt.

8-Arithmetic shift left operation-Produces the same result as obtained with logical shift left operation. For Examp-

9-Zero address instruction format is used for-Stack-organized architecture.

10-Address symbol table is generated by the-assembler.

11-The negative numbers in the binary system can be represented by-2's complement

13-ABCD - seven segment decoder / driver in connected to an LED display. Which segments are illuminated for the input code DCBA = 0001. A)b, c

14-How many flip-flops are required to produce a divide-by-32 device? 5

15-The content of a 4-bit register is initially 1101. The register is shifted 2 times tothe right with the serial input being 1011101. What is the content of the register after each shift?- 1110, 0111

16-How many different addresses are required by the memory that contain 16K words?- 16,384

17-What is the bit storage capacity of a ROM with a 512' 4-organization?- 2048

18-DMA interface unit eliminates the need to use CPU registers to transfer data From-Memory to I/O units

19-How many 128 x 8 RAM chips are needed to provide a memory capacity of 2048 bytes?-16

20-Which of the following is a self complementing code?-8421

21-Which gate can be used as anti-coincidence detector?-XOR

22-Which of the following technology can give high speed RAM?- ECL

23-In 8085 microprocessor how many I/O devices can be interfaced in I/O mapped I/O technique?- 256 input devices & 256 output devices.

24-After reset, CPU begins execution of instruction from memory address-0000H

25-Which is true for a typical RISC architecture?- Micro programmed control unit.

26-When an instruction is read from the memory, it is called-Fetch cycle

27-Which activity does not take place during execution cycle?- Branch address is calculated & Branching 
conditions are checked.

28-A circuit in which connections to both AND and OR arrays can be programmed is called-RAM

29-If a register containing data (11001100)2 is subjected to arithmetic shift left operation, then the content of the register after 'ashl' shall be-(10011000)2

30-Which logic is known as universal logic? NAND logic.

31-The time for which the D-input of a D-FF must not change after the clock is applied is known as- Hold time.

32-How many memory chips of (128 x 8) are needed to provide a memory capacity of 4096 x 16?- 64

33-In addition of two signed numbers, represented in 2' s complement form

generates an overflow if-A Å B = 1

34-Addition of (1111)2 to a 4 bit binary number 'a' results:- No change

35-In a microprocessor system, suppose. TRAP, HOLD, RESET Pin got activated at the same time, while the processor was executing some

instructions, then it will first respond to-None

36-Pseudo instructions are-Machine instructions

37-An attempt to access a location not owned by a Program is called- Address fault

38-Dynamic RAM consumes _Less_ Power and _Slower_ then the Static RAM.

39-Which flag of the 8085's flag register is not accessible to programmer directly?-- Auxiliary carry flag

40-Cache memory works on the principle of - Locality of reference

41- Which of the following is a Pseudo instruction?- END

42- A demultiplexer can be used as- Decoder

43- Excess-3 equivalent representation of (1234)H is- (4567)Ex-3

44- Which of the memory holds the information when the Power Supply is switched off?- EEROM

45- Minimum no. of NAND gate required to implement a Ex-OR function is- 4

46- Which of the following interrupt is maskable?- RST 7.5

47- Which of the following expression is not equivalent to x?- x NOR 1

48-     Word 20 contains 40
          Word 30 contains 50
          Word 40 contains 60
          Word 50 contains 70
Which of the following instructions does not, load 60 into the Accumulator- Load direct 30

49- An interrupt for which hardware automatically transfers the program to a specific
memory location is known as- Hardware interrupt

50- Synchronous means _______ At same time

51- 'n' Flip flops will divide the clock frequency by a factor of- n

52- In DMA the data transfer is controlled by- I/O devices

53- The number of instructions needed to add a numbers an store the result in memory using only one address instruction is- Independent of n

54- Negative numbers cannot be represented in- 2's complement form

55- Which of the following architecture is/are not suitable for realizing SIMD- Von Neumann

56- In Boolean expression A+BC equals- (A+B)(A+C)

57- A JK flip-flop can be implemented using D flip-flop connected such that-

58- An effective solution to the power consumption problem lies in using _______ transistors to implement ICs.- both NMOS & PMOS

59- Memory interleaving technique is used to address the memory modules in order to Have- reduced complexity in mapping hardware

60- In a multiprogramming system, which of the following is used- Paging concept


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