计算机组成原理题库(编辑修改稿)

计算机组成原理题库(编辑修改稿)内容摘要：

eed. 问题 11 The mercial 4bit ALU chip 74181 can only perform 16 different arithmetic operations. 问题 12 4bit Arithmetic Logic Unit 74181 can perform ( ). A. 16 possible logic operations B. 16 different arithmetic operations C. 4bit multiplication/division operations D. 16 different arithmetic operations or 16 possible logic operations 问题 13 ALU belongs to ( ). A. calculator unit B. control unit C. memory D. register 问题 14 Using four 74181ALU chips and one 74182CLA chip can achieve the following carry propagation circuit: ( ). A. carry lookahead of all 16 bits B. ripple carry inside each 4bit group and carry lookahead across different groups C. ripplecarry circuit D. carry lookahead inside each 4bit group and ripple carry across different groups 第六章 问题 1 Exponent unit in floating point calculator can realize addition, subtraction, multiplication and division operations. 问题 2 In addition/subtraction operation on two floating point numbers, x＝ Mx2Ex and y＝ My2Ey, it requires exponent equalization before arithmetic operation. If ExEy, shift__My___。 if ExEy, shift_Mx____。 if Ex=Ey, no shift. 问题 3 The mantissa of floating point number uses 2‟s plement representation, the binary code of the mantissa before normalization is . It needs _left_ normalization, and it should shift_1_bit. 问题 4 ( ) representation is used in mantissa of floating point number. A. biased code or excess2q code B. sign magnitude C. 2‟s plement D. 1‟s plement 问题 5 In the representation of floating point numbers, （ ） is implicit(隐含 ) B. the radix of the number system to represent the mantissa C. mantissa D. sign bit 问题 6 For a IEEE 754 standard FloatingPoint number, its mantissa uses ( ) representation. A. biased code or excess2q code B. 1‟s plement C. sign magnitude D. 2‟s plement 问题 7 Which of the followings is correct: A. Exponent unit can realize addition, subtraction, multiplication and division operations. B. Mantissa unit only realize multiplication and subtraction operations. C. Exponent unit only realize addition and subtraction for exponent. D. Floating point calculator can be implemented by exponent and mantissa units. 问题 8 The maximal positive number in IEEE754 standard for 32bits format is （） A. +（ 2 – 223） 2+255 B. +（ 2 – 223） 2+127 C. +（ 1 – 223） 2+127 D. 2+127 + 227 问题 9 Exponent unit in floating point calculator can realize operations of addition, subtraction and pare. 问题 10 Which is normalized FloatingPoint number, if its mantissa is represented by 2‟s plement format? A. B. C. D. 问题 11 In IEEE 754 standard, a floating point number is posed of sign bit s, exponent e, and mantissa m. 问题 12 The sign bit „1‟ of a biased code number represents the number for__非负数 _, while „0‟ represents the number for__负数 ___. 问题 13 In IEEE754 standard floating point, mantissa is coded as__原码 __, exponent is coded as_移码 . 问题 14 In IEEE 754 standard, the value of exponent is represented in excess128 code. 问题 15 In a algorithm for normalized floatpoint number, a number is 25 , with 2‟s plement representation for mantissa. Then it ( ). A. needs left shift 2 bits of mantissa for normalized B. needs left shift 1 bit of mantissa for normalized. C. needs no normalized right normalized 问题 16 The exponent, E, of a floating point number usually uses biased code representation, which is more convenient for paring size or exponent equalization. 问题 17 The mantissa of a FloatingPoint number is represented by 2‟s plement, then whether the FloatingPoint number is normalized is decided by ( ). A. mantissa‟s sign bit and the first bit of mantissa‟s numerical part are identical B. the sign bit of exponent and mantissa are identical C. mantissa‟s sign bit and the first bit of mantissa‟s numerical part are different D. the sign bit of exponent and mantissa are different 问题 18 In the representation of floating point numbers, ___基数 ___ is implicit and invisible to the puter hardware. 问题 19 The purpose of using normalized floating point number is ( ). A. to expand the range of data representation avoid for overflow C. convenient for floating point operation D. to ensure maximum accuracy of representation 问题 20 ( ) representation is used in exponent of FloatingPoint number. A. biased code or excess2q code B. 1‟s plement C. sign magnitude D. 2‟s plement 第七章 问题 1 Indirect addressing mode is designed to facilitate the access of data arrays. 问题 2 Instruction set is a key factor to represent the performance of a puter. 问题 3 RegisterRegister (RR) addressing mode is slower than RegisterStorage (RS) addressing mode. 问题 4 The function of program control instructions is （ ） . A. to perform arithmetic and logic operations B. to move data between I/O and CPU C. to move data between memory and CPU D. to change the program executing order 问题 5。