9294 + Mcqs in Electronics and Communication Engineering Page 80 McqOptions

3951.	"Micro-programming" is a technique
A.	for programming the microprocessors
B.	for writing small programs efficiently
C.	for programming the control steps of a computer
D.	for programming output/input
Answer» D. for programming output/input

Discussion

3952.	Status register in the 8156 contains information about
A.	the timer
B.	the ports
C.	both (a) and (b)
D.	none of the above
Answer» D. none of the above

Discussion

3953.	The noise margin of a TTL gate is about
A.	0.2 V
B.	0.4 V
C.	0.6 V
D.	0.8 V
Answer» C. 0.6 V

Discussion

3954.	The output Y of the circuit shown in the figure is
A.	(A + B) C + DE
B.	AB + C(D + E)
C.	(A + B) C + D + E
D.	(AB + C) . DE
Answer» B. AB + C(D + E)

Discussion

3955.	Status register in the 8156 is read with
A.	IN 20 H
B.	OUT 20 H
C.	either (a) or (b)
D.	none of the above
Answer» B. OUT 20 H

Discussion

3956.	Computer virus is a piece of rough software of unknown origin that
A.	copies itself like a breeding germ
B.	spreads from one machine to another
C.	eats away processing power
D.	all of the above
Answer» E.

Discussion

3957.	As compared to TTL, CMOS logic has
A.	higher speed of operation
B.	higher power dissipation
C.	smaller physical size
D.	all of the above
Answer» D. all of the above

Discussion

3958.	In a 4 bit full adder how many half adders and OR gates are required
A.	8 and 4
B.	7 and 4
C.	7 and 3
D.	8 and 3
Answer» D. 8 and 3

Discussion

3959.	Words having 8 bits are to be stored into computer memory. The number of lines required for writing into memory are
A.	1
B.	2
C.	4
D.	8
Answer» E.

Discussion

3960.	For the logic circuit given, what is the simplified Boolean function?
A.	X = AB + C
B.	X = BC + A
C.	X = AB + AC
D.	X = AC + B
Answer» C. X = AB + AC

Discussion

3961.	The given figure shows a K-map for a Boolean function. The number of essential prime implicants is
A.	4
B.	5
C.	6
D.	8
Answer» B. 5

Discussion

3962.	In 8085 microprocessor, an interrupt service request is serviced
A.	immediately on receipt of request
B.	after the execution of the current instruction is completed
C.	at the end of the current machine cycle
D.	none
Answer» C. at the end of the current machine cycle

Discussion

3963.	An XOR gate with 6 variables is as follows A B C D E F. The number of minterms in the Boolean expression is
A.	6
B.	12
C.	64
D.	32
Answer» E.

Discussion

3964.	Which interrupts are masked?
A.	5.5
B.	6.5
C.	7.5
D.	None
Answer» C. 7.5

Discussion

3965.	A clock pulse is fed into 3 bit binary down count. The signal at B output is
A.	<img src="/_files/images/electronics-and-communication-engineering/digital-electronics/51-825-1.png">
B.	<img src="/_files/images/electronics-and-communication-engineering/digital-electronics/51-825-2.png">
C.	<img src="/_files/images/electronics-and-communication-engineering/digital-electronics/51-825-3.png">
D.	none of these
Answer» B. <img src="/_files/images/electronics-and-communication-engineering/digital-electronics/51-825-2.png">

Discussion

3966.	CMOS is extensively used in
A.	pocket calculators
B.	digital wrist watches
C.	satellites
D.	all of the above
Answer» E.

Discussion

3967.	Binary 1000 multiplied by binary 1000 gives
A.	10000
B.	100000
C.	1000000
D.	10000000
Answer» D. 10000000

Discussion

3968.	111012 x 100012 =
A.	111101101
B.	111101100
C.	11110
D.	1100110
Answer» B. 111101100

Discussion

3969.	In a four variable Karnaugh map, eight adjacent cells give a
A.	two variable term
B.	single variable term
C.	three variable term
D.	four variable term
Answer» C. three variable term

Discussion

3970.	A 4 : 1 multiplexer requires __________ data select line.
A.	1
B.	2
C.	3
D.	4
Answer» C. 3

Discussion

3971.	The number of unused states in a 4 bit Johnson counter is
A.	2
B.	4
C.	8
D.	12
Answer» D. 12

Discussion

3972.	It is desired to display the digit 7 using a seven segment display. The LEDs to be turned on are
A.	<i>a, b, c</i>
B.	<i>b, c, d</i>
C.	<i>c, d, e</i>
D.	<i>a, b, d</i>
Answer» B. <i>b, c, d</i>

Discussion

3973.	For a MOD-12 counter, the FF has a tpd = 60 ns The NAND gate has a tpd of 25 n sec. The clock frequency is
A.	3.774 MHz
B.	> 3.774 MHz
C.	< 3.774 MHz
D.	4.167 MHz
Answer» B. > 3.774 MHz

Discussion

3974.	1001012 is equal to decimal number
A.	47
B.	37
C.	21
D.	17
Answer» C. 21

Discussion

3975.	A Read/Write memory chip has a capacity of 64 k bytes. Assuming separate data and address line and availability of chip enable signal, what is the minimum number of pins required in the IC chip?
A.	28
B.	26
C.	24
D.	22
Answer» B. 26

Discussion

3976.	SSI refers to ICs with
A.	less than 12 gates on the same chip
B.	less than 8 gates on the same chip
C.	less than 6 gates on the same chip
D.	less than 3 gates on the same chip
Answer» B. less than 8 gates on the same chip

Discussion

3977.	In 8085, TRAP is
A.	always maskable
B.	cannot interrupt a service subroutine
C.	used for catastrophic events like temporary power failure
D.	lowest priority interrupt
Answer» D. lowest priority interrupt

Discussion

3978.	The simplest register is
A.	buffer register
B.	shift register
C.	controlled buffer register
D.	bidirectional register
Answer» B. shift register

Discussion

3979.	The logic realized by the circuit shown in figure
A.	F = A &odot; C
B.	F = A C
C.	F = B &odot; C
D.	F = B C
Answer» C. F = B &odot; C

Discussion

3980.	Consider the following statements: A multiplier selects one of the several inputs and steers it to the outputroutes the data from a single input to many outputsconverts parallel data into serial datais a combinational circuit On the above statements which are correct?
A.	1, 2, 4
B.	2, 3, 4
C.	1, 3, 4
D.	1, 2, 3
Answer» D. 1, 2, 3

Discussion

3981.	In the full adder, denoting Sum by S and carry by C
A.	S = 1 when two or more inputs are unity
B.	C = 1 when two or more inputs are unity
C.	C = 1 when all the inputs are unity
D.	S = 1 when all the inputs are unity
Answer» C. C = 1 when all the inputs are unity

Discussion

3982.	When signed numbers are used in binary arithmetic, which of the following has unique representation for zero?
A.	Sign-magnitude
B.	1's complement
C.	2's complement
D.	9's complement
Answer» D. 9's complement

Discussion

3983.	Which of the following characteristics is not true for TTL Logic?
A.	Good speed
B.	Low power dissipation per gate
C.	High cost
D.	None of these
Answer» D. None of these

Discussion

3984.	Each term in POS form is called max terms.
A.	True
B.	False
Answer» B. False

Discussion

3985.	Assertion (A): A demultiplexer can be used as a decoder.Reason (R): A demultiplexer can be built by using AND gates only.
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

3986.	Assertion (A): The output of a NOR gate is equal to the complement of OR of input variables. Reason (R): A XOR gate is a universal gate.
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

3987.	The number of bits in ASCII is
A.	12
B.	10
C.	9
D.	7
Answer» E.

Discussion

3988.	4 bit 2's complement representation of a decimal number is 1000. The number is
A.	+ 8
B.	0
C.	- 7
D.	- 8
Answer» E.

Discussion

3989.	Pentavalent impurity creates n type semiconductor.
A.	True
B.	False
Answer» B. False

Discussion

3990.	When avalanche breakdown occurs covalent bonds are not affected.
A.	True
B.	False
Answer» C.

Discussion

3991.	In p channel JFET, VGS is positive.
A.	True
B.	False
Answer» B. False

Discussion

3992.	Fermi level is the amount of energy in which
A.	a hole can have at room temperature
B.	an electron can have at room temperature
C.	must be given to an electron move to conduction band
D.	none of the above
Answer» D. none of the above

Discussion

3993.	To produce p type semiconductor we add
A.	acceptor atoms
B.	donor atoms
C.	pentavalent impurity
D.	trivalent impurity
Answer» E.

Discussion

3994.	Human body cannot sustain electric current beyond
A.	1 A
B.	10 A
C.	5 A
D.	35 A
Answer» E.

Discussion

3995.	As compared to bipolar junction transistor, a FET
A.	is less noisy
B.	has better thermal stability
C.	has higher input resistance
D.	all of the above
Answer» E.

Discussion

3996.	For a P-N diode, the number of minority carriers crossing the junction depends on
A.	forward bias voltage
B.	potential barrier
C.	rate of thermal generation of electron hole pairs
D.	none of the above
Answer» D. none of the above

Discussion

3997.	Ripple factor is
A.	<img src="/_files/images/electronics-and-communication-engineering/electronic-devices-and-circuits/68-703-1.png">
B.	<img src="/_files/images/electronics-and-communication-engineering/electronic-devices-and-circuits/68-703-2.png">
C.	<img src="/_files/images/electronics-and-communication-engineering/electronic-devices-and-circuits/68-703-3.png">
D.	<img src="/_files/images/electronics-and-communication-engineering/electronic-devices-and-circuits/68-703-4.png">
Answer» B. <img src="/_files/images/electronics-and-communication-engineering/electronic-devices-and-circuits/68-703-2.png">

Discussion

3998.	The addition of p type impurity to intrinsic material creates allowable energy levels.
A.	slightly below conduction band
B.	slightly above conduction band
C.	slightly below valence band
D.	slightly above valence band
Answer» E.

Discussion

3999.	Figure represents a
A.	LED
B.	Varistor
C.	SCR
D.	Diac
Answer» B. Varistor

Discussion

4000.	The term efficacy, is defined by
A.	same as efficiency
B.	measure of the ability of a device to produce a desired effect
C.	input/output
D.	(efficiency)
E.	<sup>2</sup>
Answer» C. input/output

Discussion

Explore topic-wise MCQs in Engineering.

"Micro-programming" is a technique

Status register in the 8156 contains information about

The noise margin of a TTL gate is about

The output Y of the circuit shown in the figure is

Status register in the 8156 is read with

Computer virus is a piece of rough software of unknown origin that

As compared to TTL, CMOS logic has

In a 4 bit full adder how many half adders and OR gates are required

Words having 8 bits are to be stored into computer memory. The number of lines required for writing into memory are

For the logic circuit given, what is the simplified Boolean function?

The given figure shows a K-map for a Boolean function. The number of essential prime implicants is

In 8085 microprocessor, an interrupt service request is serviced

An XOR gate with 6 variables is as follows A B C D E F. The number of minterms in the Boolean expression is

Which interrupts are masked?

A clock pulse is fed into 3 bit binary down count. The signal at B output is

CMOS is extensively used in

Binary 1000 multiplied by binary 1000 gives

111012 x 100012 =

In a four variable Karnaugh map, eight adjacent cells give a

A 4 : 1 multiplexer requires __________ data select line.

The number of unused states in a 4 bit Johnson counter is

It is desired to display the digit 7 using a seven segment display. The LEDs to be turned on are

For a MOD-12 counter, the FF has a tpd = 60 ns The NAND gate has a tpd of 25 n sec. The clock frequency is

1001012 is equal to decimal number

A Read/Write memory chip has a capacity of 64 k bytes. Assuming separate data and address line and availability of chip enable signal, what is the minimum number of pins required in the IC chip?

SSI refers to ICs with

In 8085, TRAP is

The simplest register is

The logic realized by the circuit shown in figure

Consider the following statements: A multiplier selects one of the several inputs and steers it to the outputroutes the data from a single input to many outputsconverts parallel data into serial datais a combinational circuit On the above statements which are correct?

In the full adder, denoting Sum by S and carry by C

When signed numbers are used in binary arithmetic, which of the following has unique representation for zero?

Which of the following characteristics is not true for TTL Logic?

Each term in POS form is called max terms.

Assertion (A): A demultiplexer can be used as a decoder.Reason (R): A demultiplexer can be built by using AND gates only.

Assertion (A): The output of a NOR gate is equal to the complement of OR of input variables. Reason (R): A XOR gate is a universal gate.

The number of bits in ASCII is

4 bit 2's complement representation of a decimal number is 1000. The number is

Pentavalent impurity creates n type semiconductor.

When avalanche breakdown occurs covalent bonds are not affected.

In p channel JFET, VGS is positive.

Fermi level is the amount of energy in which

To produce p type semiconductor we add

Human body cannot sustain electric current beyond

As compared to bipolar junction transistor, a FET

For a P-N diode, the number of minority carriers crossing the junction depends on

Ripple factor is

The addition of p type impurity to intrinsic material creates allowable energy levels.

Figure represents a

The term efficacy, is defined by