5-59. 5-60. 5-61. 5-62. 5-63. A zero in what (a) position indicates a positive number and a one in what (b) position indicates a negative number? 1.  (a)  msb (b) lsb 2.  (a)  msb (b) msb 3.  (a)  lsb (b) lsb 4.  (a)  lsb (b) msb In a 6-bit register, the largest positive value that can be contained is what decimal number? 1. 31 2. 32 3. 63 4. 64 When floating-point operations are performed, the radix point must be aligned properly. The alignment of the radix point takes place at which of the following times? 1.  During  arithmetic  operations  only 2.  After  arithmetic  operations  only 3. Either during or after arithmetic operations, depending on the type of operation 4.  Before  arithmetic  operations In floating-point operations, what is the fractional portion of the number called? 1.  Characteristic 2.   Mantissa 3.  Radix 4.   Sign In a number, the radix point is usually placed in what location? 1. Between the sign bit and the msb of the characteristic 2. Between the sign bit and the lsb of the characteristic 3. Between the sign bit and the lsb of the mantissa 4. Between the sign bit and the msb of the mantissa IN ANSWERING QUESTION 5-64, REFER TO FIGURE 5-15, FRAME A, ON PAGE 5-21 IN THE TRAMAN. 5-64. 5-65. 5-66. 5-67. 5-68. For which of the following reasons is zero extended through the most significant 16 bits of the word that contains the characteristic? 1. The integer is a positive number 2. The integer is a negative number 3. The mantissa is a positive number 4. The mantissa is a negative number Where the most accuracy is required during floating-point operations, (a) what format is used with two 32-bit words and (b) what is the relationship of the characteristic to the mantissa? 1.  (a)  Single-precision (b)  Characteristic  is  smaller 2. (a) Single-precision (b) Characteristic is larger 3.  (a)  Double-precision (b) Characteristic is smaller 4.  (a)  Double-precision (b)  Characteristic  is  larger Under which of the following conditions are the mantissa’s results rounded up? 1. When the mantissa is less than one-half of one  only 2. When the mantissa is greater than one-half of one only 3. When the mantissa is equal to or less than one-half  of  one 4. When the mantissa is equal to or greater than one-half  of  one What type of floating-point interrupt condition, if any, exists when there is a positive excess? 1.  Overflow 2.  Underflow 3.   Divisor 4. None, there is no floating point interrupt What method does the ALU use to perform arithmetic and logical instructions? 1. Logical quotients of the logic gates 2. Logical products of the logic gates 3. Logical sums of the logic gates 4. Logical differences of the logic gates 33