Classical

Digital Logic - Combinational Circuits

41:   Adders
A. adds 2 bits
B. is called so because a full adder involves two half-adders
C. needs two input and generates two output
D. All of these
 
 

Option: D

Explanation :


42:   The inverter OR-gate and AND gate are called deeision-making elements because they can recognize some input while disregarding others. A gate recognize a word when its output is

A. words,high
B. bytes,low
C. bytes,high
D. character,low
 
 

Option: A

Explanation :


43:   Which one of the following set of gates are best suited for 'parity' checking and 'parity' generation.
A. AND, OR, NOT gates
B. EX-NOR or EX-OR gates
C. NAND gates
D. NOR gates
 
 

Option: B

Explanation :

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44:   An AND circuit
A. is a memory circuit
B. gives an output when all input signals are present simultaneously
C. is a -ve OR gate
D. is a linear circuit
 
 

Option: B

Explanation :


45:   Which of the following adders can add three or more numbers at a time ?
A. Parallel adder
B. Carry-look-ahead adder
C. Carry-save-adder
D. Full adder
 
 

Option: C

Explanation :




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