Questions 31 to 40
31.

The gray code of a given binary number 1001 is
 
Which of the following representation requires the least number of bits to store the number +255?
 
For two variables, n=2 , the number of possible Boolean functions is
 
The one major advantage of CMOS is its,
 
64K memory contains how many words of 8 bits each?
 
The simplest way to determine cache locations in which to store memory blocks is the,
 
The sum of 6 and 13 using 2’s complement addition is,
 
Which one of the following CPU registers holds the address of the instructions (instructions in the program stored in memory) to be executed next?
 
What are the major components of a CPU?
 
Given the characteristic table of a JK flipflop, find the missing output value.
J K Q(t+1)
0 0 Q(t)
0 1 0
1 0 1
1 1 

Answers
31.

Answer : (c)
Reason: The gray code of 1001 is 1101

Answer : (d)
Reason: Unsigned binary representation occupies less space to store the number +255.
 
Answer : (c)
Reason: The AND, and OR functions are only two of a total of 16 possible functions formed with two binary variables. Therefore, for two variables n=2, and the number of possible Boolean functions is 16.
 
Answer : (b)
Reason: This means that it is not practical for use in systems requiring highspeed operations. The characteristic parameters for the CMOS gate depend on the power supply voltage VDD that is used. The power dissipation increases with increase in voltage supply. The propagation delay decreases with increase in voltage supply and the noise margin is estimated to be about 40% of the voltage supply value.
 
Answer : (a)
Reason: Consider the 20bit logical address. The 4bit segment number specifies one of 16 possible segments. The 8bit page number can specify up to 256 pages, and the 8bit word field implies a page size of 256 words. This configuration allows each segment to have any number of pages up to 256. the smallest possible segment will have one page of 256 words. The largest possible segment will have 256 pages, for a total of 256*256 = 65,536 which means 64K words.
 
Answer : (b)
Reason: Associative memories are expensive compared to randomaccess memories because of the added logic associated with each cell. Therefore, the simplest way to determine cache locations in which to store memory blocks is the Direct Mapping.
 
Answer : (d)
Reason: 2’s complement of 6 = 11111010
2’s complement of 13 = 11110011
Add the two numbers in their 2’s complement form, including their sign bits and discard any carry out of the sign (leftmost) bit position. So the answer is 11101101 (19).
6 11111010
13 11110011

19 11101101
 
Answer : (e)
Reason: Program Counter (PC) keeps track of the instruction of the program stored in memory.
 
Answer : (a)
Reason: The major components of CPU are Control Unit, Register Set, and Arithmetic Logic Unit.
 
Answer : (d)
Reason:

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