Q. How many pulses are needed to change the contents of a 8-bit up counter from 10101100 to 00100111 (rightmost bit is the LSB)?

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Q. We want to design a synchronous counter that counts the sequence 0-1-0-2-0-3 and then repeats. The minimum number of J-K flip-flops required to implement this counter is

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Q. Consider a carry lookahead adder for adding two n-bit integers, built using gates of fan-in at most two. The time to perform addition using this adder is

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Q. Consider an eight-bit ripple-carry adder for computing the sum of A and B, where A and B are integers represented in 2’s complement form. If the decimal value of A is one, the decimal value of B that leads to the longest latency for the sum to stabilize is _____________

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Q. Let X be the number of distinct 16-bit integers in 2’s complement representation. Let Y be the number of distinct 16-bit integers in sign magnitude representation. Then X −Y is _________

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Q. The addition of 4-bit, two's complement, binary numbers 1101 and 0100 results in

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Q. Which of the following input sequences for a cross-coupled R-S flip-flop realized with two NAND gates may lead to an oscillation ?

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Q. The following bit pattern represents a floating point number in IEEE 754 single precision format 1 10000011 101000000000000000000000 The value of the number in decimal form is

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Q. A processor that has carry, overflow and sign flag bits as part of its program status word (PSW) performs addition of the following two 2's complement numbers 01001101 and 11101001. After the execution of this addition operation, the status of the carry, overflow and sign flags, respectively will be:

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Q. The complement of the function F = (A + B’)(C’ + D)(B’ + C) is:

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Q. To put the 8085 microprocessor in the wait state

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Q. Comparing the time T1 taken for a single instruction on a pipelined CPU with time T2 taken on a non­ pipelined but identical CPU, we can say that

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Q. The 8085 microprocessor responds to the presence of an interrupt

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Q. The most appropriate matching for the following pairs

X: Indirect addressing 1 : Loops

Y: Immediate addressing 2 : Pointers

Z: Auto decrement addressing 3: Constants

is

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Q. Consider the values A = 2.0 x 10^30, B =-2.0 x 10^30, C= 1.0, and the sequence

X: = A + B Y: = A + C
X: = X + C Y: = Y + B

executed on a computer where floating-point numbers are represented with 32 bits. The values for X and Y will be

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Q. A low memory can be connected to 8085 by using

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Q. Suppose a processor does not have any stack pointer register. Which of the following statements is true?

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Q. A processor needs software interrupt to

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Q. A CPU has two modes-privileged and non-privileged. In order to change the mode from privileged to non-privileged

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Q. Which is the most appropriate match for the items in the first column with the items in the second column:

X. Indirect Addressing I. Array implementation
Y. Indexed Addressing II. Writing re-locatable code
Z. Base Register Addressing III. Passing array as parameter

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