287 + Mcqs in Digital Computer Electronics Page 3 McqOptions

101.	Conversion of an octal number 608 to binary number is
A.	1100002
B.	100112
C.	11001112
D.	11001102
Answer» B. 100112

Discussion

102.	An AND gate has 7 inputs, what is the only input word that produces a 1 output?
A.	0
B.	1111
C.	1110000
D.	1111111
Answer» E.

Discussion

103.	Conversion of binary number 11000012 to hexadecimal is
A.	5716
B.	6116
C.	5116
D.	4316
Answer» C. 5116

Discussion

104.	The control and arithmetic-logic sections are called the _____
A.	Block diagram
B.	Control Unit
C.	Input / Output Unit
D.	Central Processing Unit
Answer» E.

Discussion

105.	Conversion of hexadecimal number 6B216 to it's binary number equivalent is
A.	11110000000000
B.	110101000000
C.	1100110000000
D.	111111112
Answer» C. 1100110000000

Discussion

106.	Conversion of decimal number 9910 to it's binary number equivalent is
A.	11000112
B.	1000112
C.	11100012
D.	111 10002
Answer» B. 1000112

Discussion

107.	Which of the following Boolean algebra rules is wrong?
A.	0 + A = A
B.	1 + A = 1
C.	A + A = A
D.	1 . x = 1
Answer» E.

Discussion

108.	Conversion of a hexadecimal number 6316 to binary number is
A.	11001112
B.	11000112
C.	1110112
D.	11001112
Answer» C. 1110112

Discussion

109.	Small-scale integration, abbreviated _____ refers to fewer than 12 gates on the same chip. Medium-scale integration (MSI) means 12 to 100 gates per chip. And large-scale integration (LSI) refers to more than _____ gates per chip.
A.	SSI, 75
B.	SSI, 100
C.	SSI, 1000
D.	SSI, 10000
Answer» C. SSI, 1000

Discussion

110.	A logic circuit which is used to change a BCD number into an equivalent decimal number is
A.	decoder
B.	encoder
C.	multiplexer
D.	code converter
Answer» B. encoder

Discussion

111.	What is the decimal equivalent of 210?
A.	4096
B.	1024
C.	1000
D.	16
Answer» C. 1000

Discussion

112.	Conversion of binary number 100000000002 to decimal number is
A.	102410
B.	103410
C.	112410
D.	103710
Answer» B. 103410

Discussion

113.	Instead of counting with binary numbers, a ring counter uses words that have a single high _____
A.	bytes
B.	bit
C.	gate
D.	chip
Answer» C. gate

Discussion

114.	Which of the following is the first integrated logic family?
A.	RTL
B.	DTL
C.	TTL
D.	MOS
Answer» B. DTL

Discussion

115.	How many full and half-adders are required to add 16-bit numbers?
A.	8 half-adders, 8 full-adders
B.	1 half-adders, 15 full-adders
C.	16 half-adders, no full-adders
D.	4 half-adders, 12 full-adders
Answer» C. 16 half-adders, no full-adders

Discussion

116.	The fan-out capability of a digital building block can be defined as
A.	the number of inputs that one output can transmit to
B.	the amount of cooling required for fanning the hear out
C.	the number of inputs that can transmit to one input
D.	the maximum power dissipation (heat generation) that the unit can stand.
Answer» B. the amount of cooling required for fanning the hear out

Discussion

117.	How many memory locations can 14 address bits access?
A.	16384
B.	8192
C.	4096
D.	14
Answer» B. 8192

Discussion

118.	Binary means _____
A.	Three
B.	Four
C.	Ten
D.	Two
Answer» E.

Discussion

119.	Conversion of binary number 111112 to an octal number is
A.	358
B.	328
C.	378
D.	428
Answer» D. 428

Discussion

120.	For an input pulse train of clock period T, the delay produced by an n stage shift register is
A.	(n-l)T
B.	nT
C.	(n+l)T
D.	2nT
Answer» B. nT

Discussion

121.	The 2-input XOR gate has a high output only when the input bits are _____
A.	even
B.	different
C.	low
D.	high
Answer» C. low

Discussion

122.	A typical microcomputer may have up to 65,536 registers in its memory. Each of these registers, usually called a _____
A.	address
B.	memory location
C.	registers
D.	chip
Answer» C. registers

Discussion

123.	Multiplication of 478 by 528 is
A.	(3144)8
B.	(4147)8
C.	(3146)8
D.	(3184)8
Answer» D. (3184)8

Discussion

124.	A combinational logic circuit which is used to send data coming from a single source to two or more separate destinations is called as
A.	decoder
B.	encoder
C.	multiplexer
D.	demultiplexer
Answer» E.

Discussion

125.	The logic 1 in positive logic system is represented by:
A.	zero voltage
B.	lower voltage level
C.	higher voltage level
D.	negative voltage
Answer» D. negative voltage

Discussion

126.	Standard TTL has a multiple emitter input transistor and a _____ output
A.	totem-pole
B.	bipolar
C.	register
D.	transistor
Answer» B. bipolar

Discussion

127.	The octal equivalent of decimal 324.987 is
A.	504.771
B.	640.781
C.	815.234
D.	90.987
Answer» B. 640.781

Discussion

128.	The 7400 series, also called standard TTL, contains a variety of SSI and _____ chips that allow us to build all kinds of digital circuits and systems.
A.	LSI
B.	MSI
C.	MOS
D.	MOSFET
Answer» C. MOS

Discussion

129.	Arithmetic operation are coded in
A.	Decision symbols
B.	Input/Outpur(I/0)
C.	Processing symbols
D.	Terminal symbols
Answer» D. Terminal symbols

Discussion

130.	What is the hexadecimal equivalent of a binary number 10101111
A.	AF
B.	9E
C.	8C
D.	All of the above
Answer» B. 9E

Discussion

131.	The reduced form of the Boolean expression (A+B)(A+C) is:
A.	AB+AC
B.	A+B+C
C.	AC+B
D.	A+BC
Answer» E.

Discussion

132.	Conversion of an octal number 1368 to hexadecimal number is
A.	70000000000000000
B.	50000000000000000
C.	5A16
D.	5D16
Answer» C. 5A16

Discussion

133.	Conversion of an octal number 478 to its binary number is
A.	1100112
B.	1001112
C.	1100112
D.	11110112
Answer» C. 1100112

Discussion

134.	With a JK master-slave flip-flop the master is cocked when the clock is _____ and the slave is triggered when the clock is _____
A.	set, reset
B.	race, no change
C.	high, low
D.	set, race
Answer» D. set, race

Discussion

135.	The highest decimal number that can be represented with 10 binary digits is
A.	1023
B.	1024
C.	512
D.	All of the above
Answer» B. 1024

Discussion

136.	_____ is the fastest logic family; it's used in high-speed applications.
A.	DTL
B.	TTL
C.	ECL
D.	MOS
Answer» D. MOS

Discussion

137.	The term sum-of-products in boolean algebra means
A.	The AND function of several OR functions
B.	The OR function of several AND functions
C.	The OR function of several OR functions
D.	The AND function of several AND functions
Answer» C. The OR function of several OR functions

Discussion

138.	Subtraction of 1001011002 from 11101010102 is
A.	10010111102
B.	1101000012
C.	11110000012
D.	11110111112
Answer» B. 1101000012

Discussion

139.	The output of the following gate is 1 only if at least one of its inputs is 0.
A.	AND gate
B.	OR gate
C.	NAND gate
D.	NOR gate
Answer» D. NOR gate

Discussion

140.	Conversion of an octal number 1428 to binary number is
A.	11000102
B.	1101102
C.	11000112
D.	11011012
Answer» B. 1101102

Discussion

141.	When the LOAD input of a buffer register is active, the input word is stored on the next positive _____ edge.
A.	clock
B.	pulse
C.	register
D.	transistor
Answer» B. pulse

Discussion

142.	An odd-parity generator produces an odd-parity bit to go along with the data. The parity of the transmitted data is _____ An XOR gate can test each received word for parity rejecting words with _____ parity.
A.	odd, even
B.	high, low
C.	low, high
D.	even, odd
Answer» B. high, low

Discussion

143.	With positive clocking the clock signal must be _____ for the flip-flop to respond.
A.	high
B.	low
C.	set
D.	race
Answer» B. low

Discussion

144.	BCD numbers are useful whenever _____ information is transferred into or out of a digital system.
A.	decimal
B.	binary
C.	ASCII
D.	hexadecimal
Answer» B. binary

Discussion

145.	Conversion of binary number 11000112 to its decimal number is
A.	2910
B.	9710
C.	9910
D.	9310
Answer» D. 9310

Discussion

146.	A combinational logic circuit which generates particular binary word or number is
A.	decoder
B.	multiplexer
C.	encoder
D.	demultiplexer
Answer» C. encoder

Discussion

147.	Consider as RS flip-flops with both inputs set to 0. If a momentary '1' is applied at the input S, then the output
A.	Q will flip from 0 to 1
B.	Q will flip from 0 to 1 and then back to 0
C.	Q will flip from 0 to 1
D.	Q will flip from 0 to 1 and then back to 0
Answer» B. Q will flip from 0 to 1 and then back to 0

Discussion

148.	Conversion of an octal number 31378 to it's decimal equivalent is
A.	163110
B.	163210
C.	153110
D.	193110
Answer» B. 163210

Discussion

149.	A _____ is a group of devices that store digital data.
A.	circuits
B.	register
C.	variations
D.	bit
Answer» C. variations

Discussion

150.	A shift register moves the _____ left or right. Serial loading means storing a word in a shift register by entering _____ bit per clock pulse. With parallel or broadside loading, it takes only one _____ pulse to load the input word.
A.	light, eight, clock
B.	right, eight, clock
C.	bits, one, register
D.	bits, one, clock
Answer» E.

Discussion

Explore topic-wise MCQs in Computer Science.

Conversion of an octal number 608 to binary number is

An AND gate has 7 inputs, what is the only input word that produces a 1 output?

Conversion of binary number 11000012 to hexadecimal is

The control and arithmetic-logic sections are called the _____

Conversion of hexadecimal number 6B216 to it's binary number equivalent is

Conversion of decimal number 9910 to it's binary number equivalent is

Which of the following Boolean algebra rules is wrong?

Conversion of a hexadecimal number 6316 to binary number is

Small-scale integration, abbreviated _____ refers to fewer than 12 gates on the same chip. Medium-scale integration (MSI) means 12 to 100 gates per chip. And large-scale integration (LSI) refers to more than _____ gates per chip.

A logic circuit which is used to change a BCD number into an equivalent decimal number is

What is the decimal equivalent of 210?

Conversion of binary number 100000000002 to decimal number is

Instead of counting with binary numbers, a ring counter uses words that have a single high _____

Which of the following is the first integrated logic family?

How many full and half-adders are required to add 16-bit numbers?

The fan-out capability of a digital building block can be defined as

How many memory locations can 14 address bits access?

Binary means _____

Conversion of binary number 111112 to an octal number is

For an input pulse train of clock period T, the delay produced by an n stage shift register is

The 2-input XOR gate has a high output only when the input bits are _____

A typical microcomputer may have up to 65,536 registers in its memory. Each of these registers, usually called a _____

Multiplication of 478 by 528 is

A combinational logic circuit which is used to send data coming from a single source to two or more separate destinations is called as

The logic 1 in positive logic system is represented by:

Standard TTL has a multiple emitter input transistor and a _____ output

The octal equivalent of decimal 324.987 is

The 7400 series, also called standard TTL, contains a variety of SSI and _____ chips that allow us to build all kinds of digital circuits and systems.

Arithmetic operation are coded in

What is the hexadecimal equivalent of a binary number 10101111

The reduced form of the Boolean expression (A+B)(A+C) is:

Conversion of an octal number 1368 to hexadecimal number is

Conversion of an octal number 478 to its binary number is

With a JK master-slave flip-flop the master is cocked when the clock is _____ and the slave is triggered when the clock is _____

The highest decimal number that can be represented with 10 binary digits is

_____ is the fastest logic family; it's used in high-speed applications.

The term sum-of-products in boolean algebra means

Subtraction of 1001011002 from 11101010102 is

The output of the following gate is 1 only if at least one of its inputs is 0.

Conversion of an octal number 1428 to binary number is

When the LOAD input of a buffer register is active, the input word is stored on the next positive _____ edge.

An odd-parity generator produces an odd-parity bit to go along with the data. The parity of the transmitted data is _____ An XOR gate can test each received word for parity rejecting words with _____ parity.

With positive clocking the clock signal must be _____ for the flip-flop to respond.

BCD numbers are useful whenever _____ information is transferred into or out of a digital system.

Conversion of binary number 11000112 to its decimal number is

A combinational logic circuit which generates particular binary word or number is

Consider as RS flip-flops with both inputs set to 0. If a momentary '1' is applied at the input S, then the output

Conversion of an octal number 31378 to it's decimal equivalent is

A _____ is a group of devices that store digital data.

A shift register moves the _____ left or right. Serial loading means storing a word in a shift register by entering _____ bit per clock pulse. With parallel or broadside loading, it takes only one _____ pulse to load the input word.

Small-scale integration, abbreviated _ refers to fewer than 12 gates on the same chip. Medium-scale integration (MSI) means 12 to 100 gates per chip. And large-scale integration (LSI) refers to more than _ gates per chip.

With a JK master-slave flip-flop the master is cocked when the clock is _ and the slave is triggered when the clock is _

An odd-parity generator produces an odd-parity bit to go along with the data. The parity of the transmitted data is _ An XOR gate can test each received word for parity rejecting words with _ parity.

A shift register moves the ___ left or right. Serial loading means storing a word in a shift register by entering _ bit per clock pulse. With parallel or broadside loading, it takes only one ___ pulse to load the input word.