Wednesday, 16 April 2014

Imporatant Notes Of Computer Architecture 2

Important objectives of Computer Architecture (30-60)
Comprehensive Viva Questions

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 ??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-(A+B)(A+c)

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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