Correct Answer: The basic expansion card types in A+ Hardware certification are ISA and PCI, ISA these can be used only on XT, AT and ATX boards The industry now considers ISA obsolate
5. What are the different Adder circuits you studied?
Correct Answer: Adders are generally of five types: 1Ripple Carry Adder: The Ripple carry adder(RCA) consists of a building block named Half Adder(HA) which is cascaded to form a Full Adder(FA) These buildingblocks HAs and FAs are also the building blocks of all types of addersThe n full adders are cascaded to form n bit RCA The full adder has three input pins(input Ai,input Bi,carryin Ci) and two output pins(Sum and Ci+1)Its equations are: Sum=Ai^Bi^Ci Ci+1=AiBi+BiCi+AiCi 2 Carry Lookahead Adder: The Carry Lookahead Adder(CLA) reduces the delay as that in RCA Let Gi=AiBi, and Pi=Ai^Bi, then Ci+1=Gi+PiCi The expressions for Sum and Ci+1 is then defined completely in terms of input pins rather wait for input carry to appear 3 Carry Select Adder: The carry select adder uses duplicate modules for each combination of input carry(ie 1 and 0)The multiplexers then select the appropriate sum and carry output according to the carry output of the preceding stages 4 Carry Skip Adder: The carry skip adder are as fast as carry lookahead adders which are the fastest adders but its spped decreases to about 20-30% if input operands are 64-bit or more In these adders we divide the input bit stream into various blocks and make use of two observations: -if each element of the two bit streams are unequal,ie Ai!=Bi than the carry input of the block is equal to the carry input -if each element of the two bit streams are equal,ie Ai=Bi than the carry input of the block is opposite of the carry input 5 Carry Save Adder: The carry save adder reduces the addition of three elements into addition of two elements,ie if you want sum of nine numbers it reduces it into sum of six numbers In first step the sum of three numbers is calculated without bothering for the carryDuring the second step only carry is calculated which is then added to the generated sum to give the required sum
6. What are * and? when using them for wildcards in windows?
Correct Answer: When we enter a URL such as googlecom then It searches through local DNS cache, if nothing is there, it queries the ISP's DNS server to resolve the URL
8. What is the difference between, page directive include, action tag include?
Correct Answer: One difference is while using the include page directive, in translation time it is creating two servelts But, while using the include action tag, in translation time it is creating only one servlet
Correct Answer: In binary representation there are some states that believed to be never occurred due to some particular functionality of a given circuit If zero output is assigned to such states then it is called minimal risk solution as we are resetting the formidable states which could be occurred accidentally Another approach is to assigned a don't care to them so it results in lesser logic and hence is called minimal cost solution