2291 + Mcqs in Digital Electronics Page 24 McqOptions

1151.	A logic circuit that provides a HIGH output if one input or the other input, but not both, is HIGH, is a(n):
A.	Ex-NOR gate
B.	OR gate
C.	Ex-OR gate
D.	NAND gate
Answer» D. NAND gate

Discussion

1152.	One CASE construct inside another CASE construct is called a do-loop.
A.	True
B.	False
Answer» C.

Discussion

1153.	The SUBDESIGN section defines the input and output of the logic circuit block.
A.	True
B.	False
Answer» B. False

Discussion

1154.	Convert the Gray code 1011 to binary.
A.	1011
B.	1010
C.	0100
D.	1101
Answer» E.

Discussion

1155.	A binary number can be converted to a decimal number by summing the decimal values of the weights of all the 1s in the binary number.
A.	True
B.	False
Answer» B. False

Discussion

1156.	1210 = 11012 = C16 = 00010010 BCD
A.	True
B.	False
Answer» C.

Discussion

1157.	A 4-variable AND-OR circuit produces a 1 at its Y output. Which combination of inputs is correct?
A.	A = 0, B = 0, C = 0, D = 0
B.	A = 0, B = 1, C = 1, D = 0
C.	A = 1, B = 1, C = 0, D = 0
D.	A = 1, B = 0, C = 0, D = 0
Answer» D. A = 1, B = 0, C = 0, D = 0

Discussion

1158.	The expression can be directly implemented using only ________.
A.	an XOR gate
B.	an XNOR gate
C.	an AOI circuit
D.	three 2-input NAND gates
Answer» D. three 2-input NAND gates

Discussion

1159.	The pulse width of a one-shot circuit is determined by ________.
A.	a resistor and capacitor
B.	two resistors
C.	two capacitors
D.	none of the above
Answer» B. two resistors

Discussion

1160.	SMT stands for small-to-medium technology.
A.	True
B.	False
Answer» C.

Discussion

1161.	The systems shown in the given figure transfer data ________.
A.	serially
B.	sequentially
C.	in parallel
D.	both serially and sequentially
Answer» E.

Discussion

1162.	How many binary bits are necessary to represent 748 different numbers?
A.	9
B.	7
C.	10
D.	8
Answer» D. 8

Discussion

1163.	What is the resultant binary of the decimal problem 49 + 01 = ?
A.	01010101
B.	00110101
C.	00110010
D.	00110001
Answer» D. 00110001

Discussion

1164.	Zeros may be added to the left of the MSB to produce even groups of 4 bits when converting from binary to hexadecimal.
A.	True
B.	False
Answer» B. False

Discussion

1165.	An inverter output is the complement of its input.
A.	True
B.	False
Answer» B. False

Discussion

1166.	The following waveform pattern is for a(n) ________.
A.	2-input AND gate
B.	2-input OR gate
C.	Exclusive-OR gate
D.	None of the above
Answer» D. None of the above

Discussion

1167.	To transmit parallel data over a serial cable, the data must first go through data conversion to the serial format.
A.	True
B.	False
Answer» B. False

Discussion

1168.	All outputs of the 74138 octal decoder are disabled (HIGH) when the enable inputs are:
A.	True
B.	False
Answer» B. False

Discussion

1169.	Incandescent 7-segment displays are especially well suited for use in portable battery-operated devices.
A.	True
B.	False
Answer» C.

Discussion

1170.	The device that is an application of SOP logic is a multiplexer.
A.	True
B.	False
Answer» B. False

Discussion

1171.	ADHL does not offer a multiplication operator.
A.	True
B.	False
Answer» B. False

Discussion

1172.	The outputs of a 7485 four-bit magnitude comparator when the inputs are A = 0110 and B = 1010 are: A < B is 1 A = B is 0 A > B is 1
A.	True
B.	False
Answer» C.

Discussion

1173.	Basically, a multiplexer changes parallel data inputs to a serial output.
A.	True
B.	False
Answer» B. False

Discussion

1174.	When outputs a, b, c, d, and g of a 7447 BCD-to-seven-segment code converter are active, the number displayed is 5.
A.	True
B.	False
Answer» C.

Discussion

1175.	When data input I5 of a 74148 octal-to-binary encoder is active, the data output is: A0 = 1 A1 = 0 A2 = 0
A.	True
B.	False
Answer» C.

Discussion

1176.	In order to select data input I1 of a 74151 eight-line multiplexer, the select inputs must be:
A.	True
B.	False
Answer» B. False

Discussion

1177.	A device that determines which of two numbers is greater is a comparator.
A.	True
B.	False
Answer» B. False

Discussion

1178.	When data input I4 of a 74148 octal-to-binary encoder is active, the data output is: A0 = 1 A1 = 1 A2 = 0
A.	True
B.	False
Answer» B. False

Discussion

1179.	In order to select data input I3 of a 74151 eight-line multiplexer, the select inputs must be:
A.	True
B.	False
Answer» B. False

Discussion

1180.	A very important attribute of the conditional signal assignment statement is its sequential operation.
A.	True
B.	False
Answer» B. False

Discussion

1181.	A demultiplexer takes an input and turns it into a binary number.
A.	True
B.	False
Answer» C.

Discussion

1182.	A(n) ________ has a number of input lines, only one of which is activated at a given time, and produces on N-bit output code, depending on which input is activated.
A.	encoder
B.	code converter
C.	demultiplexer
D.	decoder
Answer» B. code converter

Discussion

1183.	The outputs of the 74138 octal decoder are enabled when the enable inputs are .
A.	True
B.	False
Answer» B. False

Discussion

1184.	For the inputs shown in the given figure, the outputs for P > Q, P = Q, and P < Q are ____, ____, and ____, respectively.
A.	1,1,1
B.	1,0,1
C.	1,0,0
D.	0,1,0
Answer» D. 0,1,0

Discussion

1185.	A multiplexer is a device that converts some code into a recognizable number or character.
A.	True
B.	False
Answer» C.

Discussion

1186.	A 75154 1-of-16 decoder has 16 outputs and decodes an input of ________ bits.
A.	two
B.	three
C.	four
D.	six
Answer» D. six

Discussion

1187.	An everyday illustration of a multiplexer is ________.
A.	the volume control in a stereo receiver
B.	the function switch on a stereo receiver
C.	the balance control on a stereo receiver
D.	the treble-bass control on a stereo receiver
Answer» C. the balance control on a stereo receiver

Discussion

1188.	The binary value of the BCD number 1000 0001 (81) is ________.
A.	0101 0001
B.	0110 0011
C.	0100 0001
D.	1000 0000
Answer» B. 0110 0011

Discussion

1189.	A decimal-to-BCD encoder has ________ data inputs.
A.	two
B.	four
C.	five
D.	ten
Answer» E.

Discussion

1190.	For the inputs shown in the given figure, the output is ________.
A.	1
B.	0
Answer» C.

Discussion

1191.	When an application, such as an encoder, calls for a unique response from a circuit corresponding to a combination of its input variables, the two methods that best serve this purpose are the ________ and the ________.
A.	CASE construct, truth TABLE
B.	if then statement, elsif statement
C.	VARIABLE, PROCESS
D.	FUNCTION, TYPE
Answer» B. if then statement, elsif statement

Discussion

1192.	A(n) ________ is a logic circuit that accepts a set of inputs that represents a binary number, and activates only the output that corresponds to that input number.
A.	decoder
B.	LED
C.	encoder
D.	demultiplexer
Answer» B. LED

Discussion

1193.	A 1-of-8 octal decoder has eight outputs and decodes an input of ________ bit(s).
A.	three
B.	two
C.	four
D.	one
Answer» B. two

Discussion

1194.	The 74139 dual four-line demultiplexer functions as a demultiplexer if data input is on the line.
A.	True
B.	False
Answer» B. False

Discussion

1195.	The select inputs to a multiplexer may also be called address lines.
A.	True
B.	False
Answer» B. False

Discussion

1196.	An eight-line multiplexer must have as inputs ________.
A.	four data inputs and three select inputs
B.	eight data inputs and two select inputs
C.	eight data inputs and three select inputs
D.	eight data inputs and four select inputs
Answer» D. eight data inputs and four select inputs

Discussion

1197.	A(n) ________ display controls the reflection of available light.
A.	MOS
B.	LCD
C.	LED
D.	LSC
Answer» C. LED

Discussion

1198.	It is normal for more than one decoder output to be active at the same time.
A.	True
B.	False
Answer» C.

Discussion

1199.	Modern computers transfer data between different devices over a common set of connecting lines called a data bus.
A.	True
B.	False
Answer» B. False

Discussion

1200.	The device that places its input data onto one of several outputs is a ________.
A.	demultiplexer
B.	multiplexer
C.	comparator
D.	counter
Answer» B. multiplexer

Discussion

Explore topic-wise MCQs in Engineering.

A logic circuit that provides a HIGH output if one input or the other input, but not both, is HIGH, is a(n):

One CASE construct inside another CASE construct is called a do-loop.

The SUBDESIGN section defines the input and output of the logic circuit block.

Convert the Gray code 1011 to binary.

A binary number can be converted to a decimal number by summing the decimal values of the weights of all the 1s in the binary number.

1210 = 11012 = C16 = 00010010 BCD

A 4-variable AND-OR circuit produces a 1 at its Y output. Which combination of inputs is correct?

The expression can be directly implemented using only ________.

The pulse width of a one-shot circuit is determined by ________.

SMT stands for small-to-medium technology.

The systems shown in the given figure transfer data ________.

How many binary bits are necessary to represent 748 different numbers?

What is the resultant binary of the decimal problem 49 + 01 = ?

Zeros may be added to the left of the MSB to produce even groups of 4 bits when converting from binary to hexadecimal.

An inverter output is the complement of its input.

The following waveform pattern is for a(n) ________.

To transmit parallel data over a serial cable, the data must first go through data conversion to the serial format.

All outputs of the 74138 octal decoder are disabled (HIGH) when the enable inputs are:

Incandescent 7-segment displays are especially well suited for use in portable battery-operated devices.

The device that is an application of SOP logic is a multiplexer.

ADHL does not offer a multiplication operator.

The outputs of a 7485 four-bit magnitude comparator when the inputs are A = 0110 and B = 1010 are: A &lt; B is 1 A = B is 0 A &gt; B is 1

Basically, a multiplexer changes parallel data inputs to a serial output.

When outputs a, b, c, d, and g of a 7447 BCD-to-seven-segment code converter are active, the number displayed is 5.

When data input I5 of a 74148 octal-to-binary encoder is active, the data output is: A0 = 1 A1 = 0 A2 = 0

In order to select data input I1 of a 74151 eight-line multiplexer, the select inputs must be:

A device that determines which of two numbers is greater is a comparator.

When data input I4 of a 74148 octal-to-binary encoder is active, the data output is: A0 = 1 A1 = 1 A2 = 0

In order to select data input I3 of a 74151 eight-line multiplexer, the select inputs must be:

A very important attribute of the conditional signal assignment statement is its sequential operation.

A demultiplexer takes an input and turns it into a binary number.

A(n) ________ has a number of input lines, only one of which is activated at a given time, and produces on N-bit output code, depending on which input is activated.

The outputs of the 74138 octal decoder are enabled when the enable inputs are .

For the inputs shown in the given figure, the outputs for P &gt; Q, P = Q, and P &lt; Q are ____, ____, and ____, respectively.

A multiplexer is a device that converts some code into a recognizable number or character.

A 75154 1-of-16 decoder has 16 outputs and decodes an input of ________ bits.

An everyday illustration of a multiplexer is ________.

The binary value of the BCD number 1000 0001 (81) is ________.

A decimal-to-BCD encoder has ________ data inputs.

For the inputs shown in the given figure, the output is ________.

When an application, such as an encoder, calls for a unique response from a circuit corresponding to a combination of its input variables, the two methods that best serve this purpose are the ________ and the ________.

A(n) ________ is a logic circuit that accepts a set of inputs that represents a binary number, and activates only the output that corresponds to that input number.

A 1-of-8 octal decoder has eight outputs and decodes an input of ________ bit(s).

The 74139 dual four-line demultiplexer functions as a demultiplexer if data input is on the line.

The select inputs to a multiplexer may also be called address lines.

An eight-line multiplexer must have as inputs ________.

A(n) ________ display controls the reflection of available light.

It is normal for more than one decoder output to be active at the same time.

Modern computers transfer data between different devices over a common set of connecting lines called a data bus.

The device that places its input data onto one of several outputs is a ________.

The outputs of a 7485 four-bit magnitude comparator when the inputs are A = 0110 and B = 1010 are: A < B is 1 A = B is 0 A > B is 1

For the inputs shown in the given figure, the outputs for P > Q, P = Q, and P < Q are , , and , respectively.

When an application, such as an encoder, calls for a unique response from a circuit corresponding to a combination of its input variables, the two methods that best serve this purpose are the and the .