9294 + Mcqs in Electronics and Communication Engineering Page 93 McqOptions

4601.	In the given figure RC = RL = 1 k , then V0 =
A.	5 V
B.	2.5 V
C.	1 V
D.	0 V
Answer» C. 1 V

Discussion

4602.	A 14 pin NOT gate 1C has __________ NOT gates.
A.	8
B.	6
C.	5
D.	4
Answer» C. 5

Discussion

4603.	F's complement of (2BFD)hex is
A.	E 304
B.	D 403
C.	D 402
D.	C 403
Answer» D. C 403

Discussion

4604.	Which of the following characteristic are necessary for a sequential circuit? It must have 6 gatesIt must have feedbackIts output should depend on past value Which of the above statements are correct?
A.	1, 2, 3
B.	1, 2
C.	2, 3
D.	1, 3
Answer» D. 1, 3

Discussion

4605.	A digital system is required to amplify a binary encoded audio signal. The user should be able to control the gain of the amplifier from a minimum to a maximum in 100 increments. The minimum number of bits required to encode, in straight binary is,
A.	8
B.	6
C.	5
D.	7
Answer» E.

Discussion

4606.	A 4 bit transistor register has output voltage of high-low-high-low. The binary number stored and its decimal equivalent are
A.	0101 and 5
B.	0101 and 10
C.	1010 and 5
D.	1010 and 10
Answer» E.

Discussion

4607.	Assertion (A): A demultiplexer cannot be used as a decoder Reason (R): A multiplexer selects one of many outputs whereas a decoder selects on output corresponding to coded input.
A.	Both A and R are correct and R is correct explanation of A
B.	Both A and R are correct but R is not correct explanation of A
C.	A is true, R is false
D.	A is false, R is true
Answer» E.

Discussion

4608.	Hexadecimal number F is called to octal number
A.	15
B.	16
C.	17
D.	18
Answer» D. 18

Discussion

4609.	A half adder can be used only for adding
A.	1 s
B.	2 s
C.	4 s
D.	8 s
Answer» B. 2 s

Discussion

4610.	What is the normal range of analog input voltage?
A.	0 to 1 V
B.	0 to 5 V
C.	5 to 15 V
D.	15V to 30V
Answer» C. 5 to 15 V

Discussion

4611.	The inputs to a NAND gate are as shown in the given figure. The waveform of output is
A.	<img src="/_files/images/electronics-and-communication-engineering/digital-electronics/31-419-1.png">
B.	<img src="/_files/images/electronics-and-communication-engineering/digital-electronics/31-419-2.png">
C.	<img src="/_files/images/electronics-and-communication-engineering/digital-electronics/31-419-3.png">
D.	<img src="/_files/images/electronics-and-communication-engineering/digital-electronics/31-419-4.png">
Answer» B. <img src="/_files/images/electronics-and-communication-engineering/digital-electronics/31-419-2.png">

Discussion

4612.	What do the contents of instruction register specify?
A.	Operand for the instruction being executed
B.	Op code for the instruction being executed
C.	Op code for the instruction to be executed next
D.	Operand for the instruction to be executed next
Answer» C. Op code for the instruction to be executed next

Discussion

4613.	In the decimal number 27, the digital 2 represents
A.	2
B.	20
C.	0.2
D.	200
Answer» C. 0.2

Discussion

4614.	In a 4 input AND gate, the total number of High outputs for 16 input states are
A.	16
B.	8
C.	4
D.	1
Answer» E.

Discussion

4615.	Symmetrical square wave of time period 100 s can be obtained from square wave of time period 10 s by using
A.	divide by 5 circuit
B.	divide by 2 circuit
C.	divide by 5 circuit followed by divide by 2 circuit
D.	BCD counter
Answer» D. BCD counter

Discussion

4616.	The initial state of a Mod-16 counter is 0110. After 37 clock pulses the state of counter will be
A.	1011
B.	0110
C.	010
D.	0001
Answer» B. 0110

Discussion

4617.	In following figure, the initial contents of the 4-bit serial in parallel out, right shift, shift register as shown in figure are 0110. After 3 clock pulses the contents of the shift register will be
A.	0000
B.	0101
C.	1010
D.	1110
Answer» D. 1110

Discussion

4618.	For the logic circuit of the given figure, the minimized expression is
A.	<img src="/_files/images/electronics-and-communication-engineering/digital-electronics/30-396.png">
B.	Y = A + B + C
C.	Y = A + B
D.	Y = ABC
Answer» B. Y = A + B + C

Discussion

4619.	Binary multiplication can be done by repeated addition.
A.	True
B.	False
Answer» B. False

Discussion

4620.	Assertion (A): In totem pole output the output impedance is low.Reason (R): TTL gate with active pull up should not be used in wired AND connection.
A.	Both A and R are correct and R is correct explanation of A
B.	Both A and R are correct but R is not correct explanation of A
C.	A is true, R is false
D.	A is false, R is true
Answer» C. A is true, R is false

Discussion

4621.	A 4 bit synchronous counter uses flip flops with a delay time of 15 ns each. The time required for change of state is
A.	15 ns
B.	30 ns
C.	45 ns
D.	60 ns
Answer» B. 30 ns

Discussion

4622.	TTL logic is preferred to DRL logic because
A.	greater fan-out is possible
B.	greater logic levels are possible
C.	greater fan-in is possible
D.	less power consumption is achieve
Answer» B. greater logic levels are possible

Discussion

4623.	Assertion (A): Schottky transistors are preferred over normal transistors in digital circuits Reason (R): A Schottky transistor when used as a switch, between cutoff and active region.
A.	Both A and R are correct and R is correct explanation of A
B.	Both A and R are correct but R is not correct explanation of A
C.	A is true, R is false
D.	A is false, R is true
Answer» B. Both A and R are correct but R is not correct explanation of A

Discussion

4624.	The inputs A and B of the given figure are applied to a two input NOR gate. The output waveform is
A.	<img src="/_files/images/electronics-and-communication-engineering/digital-electronics/23-275-1.png">
B.	<img src="/_files/images/electronics-and-communication-engineering/digital-electronics/23-275-2.png">
C.	<img src="/_files/images/electronics-and-communication-engineering/digital-electronics/23-275-3.png">
D.	<img src="/_files/images/electronics-and-communication-engineering/digital-electronics/23-275-4.png">
Answer» C. <img src="/_files/images/electronics-and-communication-engineering/digital-electronics/23-275-3.png">

Discussion

4625.	In the circuit of the given figure, V0 =
A.	5 V
B.	3.1 V
C.	2.5 V
D.	0
Answer» B. 3.1 V

Discussion

4626.	A parallel in-parallel out shift register can be used to introduce delay in digital circuits.
A.	True
B.	False
Answer» C.

Discussion

4627.	A 14 pin AND gate IC has __________ AND gates.
A.	8
B.	6
C.	4
D.	2
Answer» D. 2

Discussion

4628.	In 8085 microprocessor, how many lines are there in data bus?
A.	6
B.	8
C.	2
D.	16
Answer» C. 2

Discussion

4629.	The basic shift register operations are
A.	serial in - serial out
B.	serial in - parallel out
C.	parallel in - serial out
D.	all of the above
Answer» E.

Discussion

4630.	The hexadecimal number 'A0' has the decimal value
A.	80
B.	256
C.	100
D.	160
Answer» E.

Discussion

4631.	A 4 bit ripple counter is in 0000 state. The clock pulses are applied and then removed. The counter reads 0011. The number of clock pulses which have occurred are
A.	3
B.	3 or 19
C.	3 or 19 or 35
D.	none of the above
Answer» D. none of the above

Discussion

4632.	Assertion (A): The propagation delay in ECL is minimum Reason (R): Transistors used in ECL switch between active and cutoff regions.
A.	Both A and R are correct and R is correct explanation of A
B.	Both A and R are correct but R is not correct explanation of A
C.	A is true, R is false
D.	A is false, R is true
Answer» B. Both A and R are correct but R is not correct explanation of A

Discussion

4633.	For the design of a sequential circuit having 9 states, minimum number of memory elements required is
A.	3
B.	4
C.	5
D.	9
Answer» C. 5

Discussion

4634.	ICs are
A.	analog
B.	digital
C.	both analog and digital
D.	mostly analog
Answer» D. mostly analog

Discussion

4635.	In a 5 x 7 dot matrix, format, to store 64 alphanumeric characters we require
A.	1120 bits
B.	2240 bits
C.	33 bits
D.	64 bits
Answer» C. 33 bits

Discussion

4636.	In the 8421 BCD code, the decimal number 125, is written as
A.	1111101
B.	0001 0010 0101
C.	7 D
D.	none of these
Answer» B. 0001 0010 0101

Discussion

4637.	110.112 x 1102 = __________ 10
A.	40.5
B.	30.5
C.	20.5
D.	10.5
Answer» B. 30.5

Discussion

4638.	Assertion (A): Different symbols are used for different gatesReason (R): IEEE symbols are the same as traditional symbols for gates.
A.	Both A and R are correct and R is correct explanation of A
B.	Both A and R are correct but R is not correct explanation of A
C.	A is true, R is false
D.	A is false, R is true
Answer» D. A is false, R is true

Discussion

4639.	10112 x 1012 = __________ 10
A.	55
B.	45
C.	35
D.	25
Answer» B. 45

Discussion

4640.	Am equivalent 2's complement representation of the 2's complement number 1101 is
A.	110100
B.	001101
C.	110111
D.	111101
Answer» E.

Discussion

4641.	In a 7 segment display the segments a, c, d, f, g are lit. The decimal number displayed will be
A.	9
B.	5
C.	4
D.	2
Answer» C. 4

Discussion

4642.	A combination circuit is one in which the output depends on
A.	input combination at that time
B.	input combination and previous output
C.	input combination and previous input
D.	present output and previous output
Answer» B. input combination and previous output

Discussion

4643.	For the logic circuit of the given figure the simplified Boolean equation
A.	Y = (A + B) (C + D) (E + F)
B.	Y = A = B + C + D + E + F
C.	ABCDEF
D.	ABC + DEF
Answer» B. Y = A = B + C + D + E + F

Discussion

4644.	The minimum number of comparators required to build an 8 bit flash ADC is
A.	8
B.	63
C.	255
D.	256
Answer» D. 256

Discussion

4645.	For a Mod-64 synchronous counter the number of flip flops and AND gates needed is
A.	6 and 4 respectively
B.	4 and 6 respectively
C.	7 and 5 respectively
D.	5 and 7 respectively
Answer» B. 4 and 6 respectively

Discussion

4646.	A 4 bit DAC gives an output of 4.5 V for input of 1001. If input is 0110, the output is
A.	1.5 V
B.	2.0 V
C.	3.0 V
D.	4.5 V
Answer» D. 4.5 V

Discussion

4647.	Out of 5 M x 8, 1 M x 16, 2 M x 16 and 3M x 8 memories, which memory can store more bits?
A.	5 M x 8
B.	2 M x 16
C.	3 M x 8
D.	1 M x 16
Answer» B. 2 M x 16

Discussion

4648.	What will be FSV in 2 bit BCD D/A converter is a weighted resistor type with ER = 1V, R = 1 M and Rf = 10K
A.	0.99 V
B.	0.9 V
C.	0.1 V
D.	0
Answer» B. 0.9 V

Discussion

4649.	In a 4 bit ripple counter using flip flops with tpd = 40 ns, the maximum frequency can be
A.	1.25 MHz
B.	3.25 MHz
C.	6.25 MHz
D.	12.5 MHz
Answer» D. 12.5 MHz

Discussion

4650.	In a JK Master slave flip flop
A.	both master and slave are positively clocked
B.	both master and slave are negatively clocked
C.	master is positively clocked and slave is negatively clocked
D.	master is negatively clocked and slave is positively clocked
Answer» D. master is negatively clocked and slave is positively clocked

Discussion

Explore topic-wise MCQs in Engineering.

In the given figure RC = RL = 1 k , then V0 =

A 14 pin NOT gate 1C has __________ NOT gates.

F's complement of (2BFD)hex is

Which of the following characteristic are necessary for a sequential circuit? It must have 6 gatesIt must have feedbackIts output should depend on past value Which of the above statements are correct?

A digital system is required to amplify a binary encoded audio signal. The user should be able to control the gain of the amplifier from a minimum to a maximum in 100 increments. The minimum number of bits required to encode, in straight binary is,

A 4 bit transistor register has output voltage of high-low-high-low. The binary number stored and its decimal equivalent are

Assertion (A): A demultiplexer cannot be used as a decoder Reason (R): A multiplexer selects one of many outputs whereas a decoder selects on output corresponding to coded input.

Hexadecimal number F is called to octal number

A half adder can be used only for adding

What is the normal range of analog input voltage?

The inputs to a NAND gate are as shown in the given figure. The waveform of output is

What do the contents of instruction register specify?

In the decimal number 27, the digital 2 represents

In a 4 input AND gate, the total number of High outputs for 16 input states are

Symmetrical square wave of time period 100 s can be obtained from square wave of time period 10 s by using

The initial state of a Mod-16 counter is 0110. After 37 clock pulses the state of counter will be

In following figure, the initial contents of the 4-bit serial in parallel out, right shift, shift register as shown in figure are 0110. After 3 clock pulses the contents of the shift register will be

For the logic circuit of the given figure, the minimized expression is

Binary multiplication can be done by repeated addition.

Assertion (A): In totem pole output the output impedance is low.Reason (R): TTL gate with active pull up should not be used in wired AND connection.

A 4 bit synchronous counter uses flip flops with a delay time of 15 ns each. The time required for change of state is

TTL logic is preferred to DRL logic because

Assertion (A): Schottky transistors are preferred over normal transistors in digital circuits Reason (R): A Schottky transistor when used as a switch, between cutoff and active region.

The inputs A and B of the given figure are applied to a two input NOR gate. The output waveform is

In the circuit of the given figure, V0 =

A parallel in-parallel out shift register can be used to introduce delay in digital circuits.

A 14 pin AND gate IC has __________ AND gates.

In 8085 microprocessor, how many lines are there in data bus?

The basic shift register operations are

The hexadecimal number 'A0' has the decimal value

A 4 bit ripple counter is in 0000 state. The clock pulses are applied and then removed. The counter reads 0011. The number of clock pulses which have occurred are

Assertion (A): The propagation delay in ECL is minimum Reason (R): Transistors used in ECL switch between active and cutoff regions.

For the design of a sequential circuit having 9 states, minimum number of memory elements required is

ICs are

In a 5 x 7 dot matrix, format, to store 64 alphanumeric characters we require

In the 8421 BCD code, the decimal number 125, is written as

110.112 x 1102 = __________ 10

Assertion (A): Different symbols are used for different gatesReason (R): IEEE symbols are the same as traditional symbols for gates.

10112 x 1012 = __________ 10

Am equivalent 2's complement representation of the 2's complement number 1101 is

In a 7 segment display the segments a, c, d, f, g are lit. The decimal number displayed will be

A combination circuit is one in which the output depends on

For the logic circuit of the given figure the simplified Boolean equation

The minimum number of comparators required to build an 8 bit flash ADC is

For a Mod-64 synchronous counter the number of flip flops and AND gates needed is

A 4 bit DAC gives an output of 4.5 V for input of 1001. If input is 0110, the output is

Out of 5 M x 8, 1 M x 16, 2 M x 16 and 3M x 8 memories, which memory can store more bits?

What will be FSV in 2 bit BCD D/A converter is a weighted resistor type with ER = 1V, R = 1 M and Rf = 10K

In a 4 bit ripple counter using flip flops with tpd = 40 ns, the maximum frequency can be

In a JK Master slave flip flop