Define combinational logic

Define combinational logic
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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.
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Data can be changed from special code to temporal code by using (A) Shift registers (B) counters (C) Combinational circuits (D) A/D converters.

Description : Data can be changed from special code to temporal code by using (A) Shift registers (B) counters (C) Combinational circuits (D) A/D converters.

Last Answer : Ans: A Data can be changed from special code to temporal code by using Shift Registers. (A Register in which data gets shifted towards left or right when clock pulses are applied is known as a Shift Register.)

Define combinational logic

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.

A full adder logic circuit will have (A) Two inputs and one output. (B) Three inputs and three outputs. (C) Two inputs and two outputs. (D) Three inputs and two outputs.

Description : A full adder logic circuit will have (A) Two inputs and one output. (B) Three inputs and three outputs. (C) Two inputs and two outputs. (D) Three inputs and two outputs.

Last Answer : Ans: D A full adder circuit will add two bits and it will also accounts the carry input generated in the previous stage. Thus three inputs and two outputs (Sum and Carry) are there.

Karnaugh map is used for the purpose of (A) Reducing the electronic circuits used. (B) To map the given Boolean logic function. (C) To minimize the terms in a Boolean expression. (D) To maximize the terms of a given a Boolean expression.

Description : Karnaugh map is used for the purpose of (A) Reducing the electronic circuits used. (B) To map the given Boolean logic function. (C) To minimize the terms in a Boolean expression. (D) To maximize the terms of a given a Boolean expression.

Last Answer : (C) To minimize the terms in a Boolean expression.

The logic 0 level of a CMOS logic device is approximately (A) 1.2 volts (B) 0.4 volts (C) 5 volts (D) 0 volts

Description : The logic 0 level of a CMOS logic device is approximately (A) 1.2 volts (B) 0.4 volts (C) 5 volts (D) 0 volts

Last Answer : Ans: D CMOS logic low level is 0 volts approx.

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

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.

Which of the following is the fastest logic? (A) ECL (B) TTL (C) CMOS (D) LSI

Description : Which of the following is the fastest logic? (A) ECL (B) TTL (C) CMOS (D) LSI

Last Answer : (A) ECL

In a positive logic system, logic state 1 corresponds to (A) positive voltage (B) higher voltage level (C) zero voltage level (D) lower voltage level

Description : In a positive logic system, logic state 1 corresponds to (A) positive voltage (B) higher voltage level (C) zero voltage level (D) lower voltage level

Last Answer : (B) higher voltage level We decide two voltages levels for positive digital logic. Higher voltage represents logic 1 & a lower voltage represents logic 0.

Which TTL logic gate is used for wired ANDing (A) Open collector output (B) Totem Pole (C) Tri state output (D) ECL gates

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.

The digital logic family which has the lowest propagation delay time is (A) ECL (B) TTL (C) CMOS (D) PMOS

Description : The digital logic family which has the lowest propagation delay time is (A) ECL (B) TTL (C) CMOS (D) PMOS

Last Answer : Ans: A The digital logic family which has the lowest propagation delay time is ECL (Lowest propagation delay time is possible in ECL because the transistors are used in difference amplifier configuration, in which they are never driven into saturation and thereby the storage time is eliminated).

Which of the following is the fastest logic (A) TTL (B) ECL (C) CMOS (D) LSI

Description : Which of the following is the fastest logic (A) TTL (B) ECL (C) CMOS (D) LSI

Last Answer : Ans: B ECL is the fastest logic family of all logic families. (High speeds are possible in ECL because the transistors are used in difference amplifier configuration, in which they are never driven into saturation and thereby the storage time is eliminated.

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

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

The digital logic family which has minimum power dissipation is (A) TTL (B) RTL (C) DTL (D) CMOS

Description : The digital logic family which has minimum power dissipation is (A) TTL (B) RTL (C) DTL (D) CMOS

Last Answer : (D) CMOS The digital logic family which has minimum power dissipation is CMOS. (CMOS being an unipolar logic family, occupy a very small fraction of silicon Chip area)

If the control signals are generated by combinational logic, then they are generated by a type of _______________ controlled unit. a) Micro programmed b) Software c) Logic d) Hardwired

Description : If the control signals are generated by combinational logic, then they are generated by a type of _______________ controlled unit. a) Micro programmed b) Software c) Logic d) Hardwired

Last Answer : Answer: d Explanation: The main task of a control unit is to generate control signals. There are two main types of control units: A hardwired control unit generates control ... combinational logic circuits and the Micro programmed control unit generates control signals by using some softwares

Which is the important part of a combinational logic block: a. Index register b. Barrel shifter c. Both a & b d. None of these

Description : Which is the important part of a combinational logic block: a. Index register b. Barrel shifter c. Both a & b d. None of these

Last Answer : b. Barrel shifter

Which of the following logic operations is performed by the following given combinational circuit ? Image (A) EXCLUSIVE-OR (B) EXCLUSIVE-NOR (C) NAND (D) NOR

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

Compare combinational logic circuit and sequential logic circuit

Description : Compare combinational logic circuit and sequential logic circuit

Last Answer : Combinational logic Sequential logic The combinational logic circuit consists of logic gate only Sequential logic circuit consists of combinational logic circuit along with memory for storage of ... , multiplexer, demultiplexer etc E.g. counters, shift registers flip-flop etc

Read the following statements: i. Gate is a combinational logic. ii. JK Flip-flop in toggle mode is not

Description : Read the following statements: i. Gate is a combinational logic. ii. JK Flip-flop in toggle mode is not combinational logic. iii. MSJK Flip-flop suffers from race-around. iv. Counters are sequential circuits. Which choice is correct? (A) i, ii (B) i, ii, iv (C) ii, iii, iv (D) i, ii, iii

Last Answer : Read the following statements: i. Gate is a combinational logic. ii. JK Flip-flop in toggle mode is not combinational logic. iii. MSJK Flip-flop suffers from race-around. iv. Counters are sequential circuits. Which choice is ... (A) i, ii (B) i, ii, iv (C) ii, iii, iv (D) i, ii, iii

Which of the following gates can be used to realize all possible combinational logic functions?

Description : Which of the following gates can be used to realize all possible combinational logic functions?  (i) OR gate (ii) NOR gate (iii) Exclusive OR gate (iv) NAND gate (v) AND gate  (A) (iii), (iv) and (v)  (B) (i), (iii) and (iv)  (C) (ii) and (iv)  (D) (i) and (v)

Last Answer : Which of the following gates can be used to realize all possible combinational logic functions?  (i) OR gate (ii) NOR gate (iii) Exclusive OR gate (iv) NAND gate (v) AND gate  (A) (iii), (iv) and (v)  (B) (i), (iii) and (iv)  (C) (ii) and (iv)  (D) (i) and (v)

Define Asynchronous sequential circuit?

Description : Define Asynchronous sequential circuit?

Last Answer : In asynchronous sequential circuits change in input signals can affect memory element at any instant of time.

Define synchronous sequential circuit

Description : Define synchronous sequential circuit

Last Answer : In synchronous sequential circuits, signals can affect the memory elements only at discrete instant of time.

Define shift registers.

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.

Define 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.

Define race around condition.

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’.

Define 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.

Define multiplexer

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.

Define Encoder?

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.

Define Decoder

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.

Define Half adder and full adder

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.

What are the different types of shift type?

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

What is a master-slave flip-flop?

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.

What is edge-triggered flip-flop?

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.

What is the operation of T flip-flop?

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.

What is the operation of JK flip-flop?

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.

What is the operation of D flip-flop?

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.

What are the different types of flip-flop?

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

What are the classification of sequential circuits?

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.

What do you mean by comparator

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.

What is priority Encoder?

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.

What is binary decoder?

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.

Convert the decimal number 3.375 to binary. 132) A) 0101.1100 B) 0011.1010 C) 0011.0011 D) 0011.01

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

Convert binary 1001 to octal. 131) A) 1018 B) 98 C) 108 D) 118

Description : Convert binary 1001 to octal. 131) A) 1018 B) 98 C) 108 D) 118

Last Answer : D) 118

Convert decimal 19 to octal. 130) A) 278 B) 218 C) 238 D) 178

Description : Convert decimal 19 to octal. 130) A) 278 B) 218 C) 238 D) 178

Last Answer : C) 238

The hexadecimal equivalent of decimal 88 is ________. 129) A) 6816 B) 5816 C) 5116 D) 551

Description : The hexadecimal equivalent of decimal 88 is ________. 129) A) 6816 B) 5816 C) 5116 D) 551

Last Answer : B) 5816

Any number with an exponent of one is equal to 128) A) two. B) itself. C) zero. D) on

Description : Any number with an exponent of one is equal to 128) A) two. B) itself. C) zero. D) on

Last Answer : B) itself.

What is the decimal value of 20? 127) A) 2 B) 0 C) 1 D) 3

Description : What is the decimal value of 20? 127) A) 2 B) 0 C) 1 D) 3

Last Answer : C) 1

The binary equivalent of hexadecimal 16 is ________. 126) A) 01110000 B) 1100001 C) 0010011 D) 0001

Description : The binary equivalent of hexadecimal 16 is ________. 126) A) 01110000 B) 1100001 C) 0010011 D) 0001

Last Answer : D) 0001

Convert binary 01001110 to octal. 125) A) 1078 B) 768 C) 1068 D) 116

Description : Convert binary 01001110 to octal. 125) A) 1078 B) 768 C) 1068 D) 116

Last Answer : D) 116

The decimal equivalent of the BCD value 0111 0110 1000 is ________. 124) A) 70810 B) 17210 C) 76810 D) 6871

Description : The decimal equivalent of the BCD value 0111 0110 1000 is ________. 124) A) 70810 B) 17210 C) 76810 D) 6871

Last Answer : C) 76810

Convert octal 32 to decimal. 123) A) 3010 B) 2610 C) 1610 D) 3201

Description : Convert octal 32 to decimal. 123) A) 3010 B) 2610 C) 1610 D) 3201

Last Answer : B) 2610