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- Question
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
- 1. In the relational model, relationships between relations or tables are created by using:
Options- A. composite keys.
- B. determinants.
- C. candidate keys.
- D. foreign keys. Discuss
- 2. What does microprocessor speed depend on? Discuss
- 3. What does RSI stand for? Discuss
- 4. Which Stack is used in 8086? Discuss
- 5. What is object repository? Discuss
- 6. Which is the Stack used in 8085? Discuss
- 7. What does GUI stand for? Discuss
- 8. What is the main reason the OSI Model was created? Discuss
- 9. Ethernet uses which topology
Options- A. Star
- B. Bus
- C. Twisted pair
- D. Both B & C Discuss
- 10. What are various scheduling queues? Discuss
More questions
Correct Answer: foreign keys.
Correct Answer: the processing speed depends on DATA BUS WIDTH
Correct Answer: Repetitive Strain Injury
Correct Answer: FIFO (First In First Out) stack is used in 8086 In this type of Stack the First Stored Information is retrieved first
Correct Answer: Object Repository means not a collection of objects it's a common repository for all the people (testing, developers) for seeing all the data in single login for example QA wants to see 5 testers works then he goes to each person login and see the data It's very difficult job for this we can use Object Repository
Correct Answer: LIFO (Last In First Out) stack is used in 8085 in this type of Stack the last stored information can be retrieved first
Correct Answer: Graphical User Interface
Correct Answer: The OSI Model is used as a reference model The primary reason the OSI model was created was so that different networks could inter-operate Hence, different networks could communicate
Correct Answer: Bus
Explanation:
Ethernet uses Bus topology.
Correct Answer: Job queue Ready queue Device queue
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