Description : A universal logic gate is one, which can be used to generate any logic function. Which of the following is a universal logic gate? (A) OR (B) AND (C) XOR (D) NAND
Last Answer : Ans: D NAND can generate any logic function.
Description : The gates required to build a half adder are (A) EX-OR gate and NOR gate (B) EX-OR gate and OR gate (C) EX-OR gate and AND gate (D) Four NAND gates.
Last Answer : (C) EX-OR gate and AND gate
Description : DeMorgan’s first theorem shows the equivalence of (A) OR gate and Exclusive OR gate. (B) NOR gate and Bubbled AND gate. (C) NOR gate and NAND gate. (D) NAND gate and NOT gate
Last Answer : (B) NOR gate and Bubbled AND gate.
Description : The output of a logic gate is 1 when all its inputs are at logic 0. the gate is either (A) a NAND or an EX-OR (B) an OR or an EX-NOR (C) an AND or an EX-OR (D) a NOR or an EX-NOR
Last Answer : (D) a NOR or an EX-NOR
Description : The NAND gate output will be low if the two inputs are (A) 00 (B) 01 (C) 10 (D) 11
Last Answer : (D) 11
Description : Why are NAND and NOR gates called digital building blocks?
Last Answer : NAND and NOR gates are called digital building blocks because they are fundamental building blocks for digital circuits. Both NAND and NOR gates are basic logic gates that can be used to construct ... construct any other logic gates and they can be combined and used to create more complex circuits.
Description : Which of the listed logic gates is considered to be a BASIC building block (basic logic gate) used in logic diagrams? A. NAND B. OR C. NOR D. All of the above.
Last Answer : Answer: B
Description : How many two input AND gates and two input OR gates are required to realize Y = BD+CE+AB (A) 1, 1 (B) 4, 2 (C) 3, 2 (D) 2, 3
Last Answer : Ans: A There are three product terms, so three AND gates of two inputs are required. As only two input OR gates are available, so two OR gates are required to get the logical sum of three product terms.
Description : How many two-input AND and OR gates are required to realize Y=CD+EF+G (A) 2,2. (B) 2,3. (C) 3,3. (D) none of these.
Last Answer : Ans: A Y=CD+EF+G Number of two input AND gates=2 Number of two input OR gates = 2 One OR gate to OR CD and EF and next to OR of G & output of first OR gate.
Description : Which TTL logic gate is used for wired ANDing (A) Open collector output (B) Totem Pole (C) Tri state output (D) ECL gates
Last Answer : Ans: A Open collector output.
Description : How many AND gates are required to realize Y = CD+EF+G (A) 4 (B) 5 (C) 3 (D) 2
Last Answer : 2
Description : Why NAND and NOR gate are called as universal gate? Draw AND gate using NAND gate only.
Last Answer : Universal gate - All basic gates functionality can be implemented using NAND and NOR gate hence these gates are called as universal gates. AND gate using NAND gate
Description : The NOR gate output will be low if the two inputs are (A) 00 (B) 01 (C) 10 (D) 11
Last Answer : A
Description : Which of the following pair of gates can form a latch? a. a pair of cross coupled OR b. a pair of cross copled AND c. a pair of cross coupled NAND d. a cross coupled NAND/OR
Last Answer : c. a pair of cross coupled NAND
Last Answer : NAND gates are preferred over others because these can be used to make any gate.
Description : Which of the following is the universal gate? 1) NAND-Gate 2) OR-Gate 3) AND-Gate 4) NOT-Gate
Last Answer : 1) NAND-Gate
Last Answer : A NAND gate is called a universal logic element because any logic function can be realized by NAND gates alone.
Description : What type of logic circuit is indicated by the truth table shown in the illustration? EL-0072 A. OR B. AND C. NOR D. NAND
Last Answer : Answer: A
Description : In a logic circuit the NOR and NAND gate functions ____________. A. must be accomplished with a common base transistor arrangement B. are available in diode form C. are exact opposites with the ... . have output conditions that are exact opposites to the output condition for OR and AND, respectively
Last Answer : Answer: D
Description : Which one is faster between NAND-SR FF and NOR-SR FF?
Last Answer : Ans-well both deals with same principle.but i think NAND-SR FF is faster than NOR-SR FF
Description : i. (X’+Y’) A. Low-pass filter function ii. (X’Y’) B. Sum iii. (XY) C. NAND D. Carry E.NOR a) i-C, ii-E, iii-D b) i-C, ii-E, iii-B c) i-C, ii-B, iii-D d) i-C, ii-E, iii-A
Last Answer : Ans: i-C, ii-E, iii-D
Description : Using DeMorgan's Theorem we can convert any AND-OR structure into a. NAND-NAND b. OR-NAND c. NAND-NOR d. NOR-NAND
Last Answer : a. NAND-NAND
Description : Which of the following logic operations is performed by the following given combinational circuit ? (A) EXCLUSIVE-OR (B) EXCLUSIVE-NOR (C) NAND (D) NOR
Last Answer : (A) EXCLUSIVE-OR
Description : Sketch symbol of NAND gate and NOR gate.
Last Answer : Symbol of NAND gate and NOR gate
Description : Define Asynchronous sequential circuit?
Last Answer : In asynchronous sequential circuits change in input signals can affect memory element at any instant of time.
Description : Define synchronous sequential circuit
Last Answer : In synchronous sequential circuits, signals can affect the memory elements only at discrete instant of time.
Description : What are the different types of shift type?
Last Answer : There are five types. They are, Serial In Serial Out Shift Register Serial In Parallel Out Shift Register Parallel In Serial Out Shift Register Parallel In Parallel Out Shift Register Bidirectional Shift Register
Description : Define shift registers.
Last Answer : The binary information in a register can be moved from stage to stage within the register or into or out of the register upon application of clock ... arithmetic and logic operations used in microprocessors. This gives rise to group of registers called shift registers.
Description : Define registers.
Last Answer : A register is a group of flip-flops flip-flop can store one bit information. So an n-bit register has a group of n flip-flops and is capable of storing any binary information/number containing n-bits.
Description : What is a master-slave flip-flop?
Last Answer : A master-slave flip-flop consists of two flip-flops where one circuit serves as a master and the other as a slave.
Description : What is edge-triggered flip-flop?
Last Answer : The problem of race around condition can solved by edge triggering flip flop. The term edge triggering means that the flip-flop changes state either at the positive ... negative edge of the clock pulse and it is sensitive to its inputs only at this transition of the clock.
Description : Define race around condition.
Last Answer : In JK flip-flop output is fed back to the input. Therefore change in the output results change in the input. Due to this in the positive half of the clock pulse if both J and K are high then output toggles continuously. This condition iscalled ‘race around condition’.
Description : What is the operation of T flip-flop?
Last Answer : T flip-flop is also known as Toggle flip-flop. • When T=0 there is no change in the output. • When T=1 the output switch to the complement state (ie) the output toggles.
Description : What is the operation of JK flip-flop?
Last Answer : When K input is low and J input is high the Q output of flip-flop is set. When K input is high and J input is low the Q output of flip-flop is reset. When both the inputs ... are high it is possible to set or reset the flip-flop (ie) the output toggle on the next positive clock edge.
Description : What is the operation of D flip-flop?
Last Answer : In D flip-flop during the occurrence of clock pulse if D=1, the output Q is set and if D=0, the output is reset.
Description : What are the different types of flip-flop?
Last Answer : There are various types of flip flops. Some of them are mentioned below they are, RS flip-flop SR flip-flop D flip-flop JK flip-flop T flip-flop
Description : Define Flip flop.
Last Answer : The basic unit for storage is flip flop. A flip-flop maintains its output state either at 1 or 0 until directed by an input signal to change its state.
Description : What are the classification of sequential circuits?
Last Answer : The sequential circuits are classified on the basis of timing of their signals into two types. They are, 1)Synchronous sequential circuit. 2)Asynchronous sequential circuit.
Description : What do you mean by comparator
Last Answer : A comparator is a special combinational circuit designed primarily to compare the relative magnitude of two binary numbers.
Description : Define multiplexer
Last Answer : Multiplexer is a digital switch. If allows digital information from several sources to be routed onto a single output line.
Description : What is priority Encoder?
Last Answer : A priority encoder is an encoder circuit that includes the priority function. In priority encoder, if 2 or more inputs are equal to 1 at the same time, the input having the highest priority will take precedence.
Description : Define Encoder?
Last Answer : An encoder has 2n input lines and n output lines. In encoder the output lines generate the binary code corresponding to the input value.
Description : What is binary decoder?
Last Answer : A decoder is a combinational circuit that converts binary information from n input lines to a maximum of 2n out puts lines.
Description : Define Decoder
Last Answer : A decoder is a multiple - input multiple output logic circuit that converts coded inputs into coded outputs where the input and output codes are different.
Description : Define Half adder and full adder
Last Answer : The logic circuit that performs the addition of two bits is a half adder. The circuit that performs the addition of three bits is a full adder.
Description : Define combinational logic
Last Answer : When logic gates are connected together to produce a specified output for certain specified combinations of input variables, with no storage involved, the resulting circuit is called combinational logic.
Description : Convert the decimal number 3.375 to binary. 132) A) 0101.1100 B) 0011.1010 C) 0011.0011 D) 0011.01
Last Answer : D) 0011.01
Description : Convert binary 1001 to octal. 131) A) 1018 B) 98 C) 108 D) 118
Last Answer : D) 118
Description : Convert decimal 19 to octal. 130) A) 278 B) 218 C) 238 D) 178
Last Answer : C) 238
Description : The hexadecimal equivalent of decimal 88 is ________. 129) A) 6816 B) 5816 C) 5116 D) 551
Last Answer : B) 5816