Home / Online Test / 4-Bit Parallel Adder/Subtractor Objective Questions – Part 2 Online Test 4-Bit Parallel Adder/Subtractor Objective Questions – Part 2 S Bharadwaj ReddyLeave a comment 4-Bit Parallel Adder/Subtractor Objective Questions Digital Electronics Objective Questions 0% Carry lookahead logic uses the concepts of Inverting the inputs Ripple factor Generating and propagating carries Complementing the outputs Correct! Wrong! - Continue >> For a 4-bit parallel adder, if the carry-in is connected to a logical HIGH, the result is: The same as if the carry-in is tied LOW since the least significant carry-in is ignored That carry-out will always be HIGH A one will be added to the final result The carry-out is ignored Correct! Wrong! - Continue >> One way to make a four-bit adder to perform subtraction is by: Inverting the B inputs Inverting the output Inverting the carry-in Grounding the B inputs Correct! Wrong! - Continue >> The main disadvantage of Manchester carry chain is Ripple factor Propagation delay Both propagation delay and capacitive load Capacitive load Correct! Wrong! - Continue >> The summing outputs of a half or full-adder are designated by which Greek symbol? Lambda Omega Sigma Theta Correct! Wrong! - Continue >> Why is a fast-look-ahead carry circuit used in the 7483 4-bit full-adder? To make it smaller To slow down the circuit To speed up the circuit To decrease the cost Correct! Wrong! - Continue >> What is Manchester carry chain? Variation of a full-adder Variation of a carry-lookahead adder Is a chain of controlled inverter None of the Mentioned Correct! Wrong! - Continue >> The carry propagation delay in 4-bit full-adder circuits: Decreases in direct ratio to the total number of full-adder stages Is normally not a consideration because the delays are usually in the nanosecond range Is cumulative for each stage and limits the speed at which arithmetic operations are performed Increases in direct ratio to the total number of full-adder stages, but is not a factor in limiting the speed of arithmetic operations Correct! Wrong! - Continue >> What is one disadvantage of the ripple-carry adder? The interconnections are more complex All of the Mentioned It is slow due to propagation time More stages are required to a full adder Correct! Wrong! - Continue >> What distinguishes the look-ahead-carry adder? It is slower than the ripple-carry adder It requires advance knowledge of the final answer It is faster than a ripple-carry adder It is easier to implement logically than a full adder Correct! Wrong! - Continue >> Fast-look-ahead carry circuits found in most 4-bit full-adder circuits which Determine sign and magnitude Reduce propagation delay Add a 1 to complemented inputs Increase ripple delay Correct! Wrong! - Continue >> Share the quiz to show your results ! Facebook Facebook Just tell us who you are to view your results ! Show my results >> 4-Bit Parallel Adder/Subtractor – 2 I got %%score%% of %%total%% right Share your results Facebook Facebook Twitter Google+ ↺ PLAY AGAIN !
