420+ Digital Electronics Solved MCQs

These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Electrical Engineering , Bachelor of Science in Computer Science FY (BSc CS) , Bachelor of Computer Applications (BCA) , Bachelor of Science in Computer Science (BSc CS) .

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301.	The full form of SR is
A.	system rated
B.	set reset
C.	set ready
D.	set rated
Answer» B. set reset

302.	The SR latch consists of
A.	1 input
B.	2 inputs
C.	3 inputs
D.	4 inputs
Answer» B. 2 inputs

303.	The outputs of SR latch are
A.	x and y
B.	a and b
C.	s and r
D.	q and q’
Answer» D. q and q’

304.	The NAND latch works when both inputs are
A.	1
B.	0
C.	inverted
D.	don’t cares
Answer» A. 1

305.	The first step of analysis procedure of SR latch is to
A.	label inputs
B.	label outputs
C.	label states
D.	label tables
Answer» B. label outputs

306.	The inputs of SR latch are
A.	x and y
B.	a and b
C.	s and r
D.	j and k
Answer» C. s and r

307.	When a high is applied to the Set line of an SR latch, then
A.	q output goes high
B.	q’ output goes high
C.	q output goes low
D.	both q and q’ go high
Answer» A. q output goes high

308.	When both inputs of SR latches are low, the latch
A.	q output goes high
B.	q’ output goes high
C.	it remains in its previously set or reset state
D.	it goes to its next set or reset state
Answer» C. it remains in its previously set or reset state

309.	When both inputs of SR latches are high, the latch goes
A.	unstable
B.	stable
C.	metastable
D.	bistable
Answer» C. metastable

310.	Which of the following logic families has the highest maximum clock frequency?
A.	s-ttl
B.	as-ttl
C.	hs-ttl
D.	hcmos
Answer» B. as-ttl

311.	Why is the fan-out of CMOS gates frequency dependent?
A.	each cmos input gate has a specific propagation time and this limits the number of different gates that can be connected to the output of a cmos gate
B.	when the frequency reaches the critical value the gate will only be capable of delivering 70% of the normal output voltage and consequently the output power will be one-half of normal and this defines the upper operating frequency
C.	the higher number of gates attached to the output the more frequently they will have to be serviced thus reducing the frequency at which each will be serviced with an input signal
D.	the input gates of the fets are predominantly capacitive and as the signal frequency increases the capacitive loading also increases thereby limiting the number of loads that may be attached to the output of the driving gate
Answer» D. the input gates of the fets are predominantly capacitive and as the signal frequency increases the capacitive loading also increases thereby limiting the number of loads that may be attached to the output of the driving gate

312.	Logic circuits that are designated as buffers, drivers or buffers/drivers are designed to have:
A.	a greater current/voltage capability than an ordinary logic circuit
B.	greater input current/voltage capability than an ordinary logic circuit
C.	a smaller output current/voltage capability than an ordinary logic
D.	greater the input and output current/voltage capability than an ordinary logic circuit
Answer» A. a greater current/voltage capability than an ordinary logic circuit

315.	What is the static charge that can be stored by your body as you walk across a carpet?
A.	300 volts
B.	3000 volts
C.	30000 volts
D.	over 30000 volts
Answer» D. over 30000 volts

316.	What must be done to interface TTL to CMOS?
A.	a dropping resistor must be used on the cmos of 12 v supply to reduce it to 5 v for the ttl
B.	as long as the cmos supply voltage is 5 v they can be interfaced (however, the fan- out of the ttl is limited to five cmos gates)
C.	a 5 v zener diode must be placed across the inputs of the ttl gates in order to protect them from the higher output voltages of the cmos gates
D.	a pull-up resistor must be used between the ttl output-cmos input node and vcc; the value of rp will depend on the number of cmos gates connected to the node
Answer» D. a pull-up resistor must be used between the ttl output-cmos input node and vcc; the value of rp will depend on the number of cmos gates connected to the node

317.	What causes low-power Schottky TTL to use less power than the 74XX series TTL?
A.	the schottky-clamped transistor
B.	a larger value resistor
C.	the schottky-clamped mosfet
D.	a small value resistor
Answer» B. a larger value resistor

313.	Which of the following will not normally be found on a data sheet?
A.	minimum high level output voltage
B.	maximum low level output voltage
C.	minimum low level output voltage
D.	maximum high level input current
Answer» C. minimum low level output voltage

314.	Which of the following logic families has the shortest propagation delay?
A.	s-ttl
B.	as-ttl
C.	hs-ttl
D.	hcmos
Answer» B. as-ttl

318.	What are the major differences between the 5400 and 7400 series of ICs?
A.	the 5400 series are military grade and require tighter supply voltages and temperatures
B.	the 5400 series are military grade and allow for a wider range of supply voltages and temperatures
C.	the 7400 series are an improvement over the original 5400s
D.	the 7400 series was originally developed by texas instruments and the 5400 series was brought out by national semiconductors after ti’s patents expired as a second supply source
Answer» B. the 5400 series are military grade and allow for a wider range of supply voltages and temperatures

319.	3 CYCLES AND RACES, STATE REDUCTION
A.	1
B.	2
C.	3
D.	4
Answer» C. 3

320.	Memory is a/an
A.	device to collect data from other computer
B.	block of data to keep data separately
C.	indispensable part of computer
D.	device to connect through all over the world
Answer» C. indispensable part of computer

321.	The instruction used in a program for executing them is stored in the
A.	cpu
B.	control unit
C.	memory
D.	microprocessor
Answer» C. memory

322.	A register file holds
A.	a large number of word of information
B.	a small number of word of information
C.	a large number of programs
D.	a modest number of words of information
Answer» D. a modest number of words of information

323.	The very first computer memory consisted of
A.	a small display
B.	a large memory storage equipment
C.	an automatic keyboard input
D.	an automatic mouse input
Answer» B. a large memory storage equipment

324.	A flip flop stores
A.	10 bit of information
B.	1 bit of information
C.	2 bit of information
D.	3-bit information
Answer» B. 1 bit of information

325.	Which one of the following has capability to store data in extremely high densities?
A.	register
B.	capacitor
C.	semiconductor
D.	flip-flop
Answer» C. semiconductor

420+ Digital Electronics Solved MCQs

The full form of SR is

The SR latch consists of

The outputs of SR latch are

The NAND latch works when both inputs are

The first step of analysis procedure of SR latch is to

The inputs of SR latch are

When a high is applied to the Set line of an SR latch, then

When both inputs of SR latches are low, the latch

When both inputs of SR latches are high, the latch goes

Which of the following logic families has the highest maximum clock frequency?

Why is the fan-out of CMOS gates frequency dependent?

Logic circuits that are designated as buffers, drivers or buffers/drivers are designed to have:

Which of the following will not normally be found on a data sheet?

Which of the following logic families has the shortest propagation delay?

What is the static charge that can be stored by your body as you walk across a carpet?

What must be done to interface TTL to CMOS?

What causes low-power Schottky TTL to use less power than the 74XX series TTL?

What are the major differences between the 5400 and 7400 series of ICs?

3 CYCLES AND RACES, STATE REDUCTION

Memory is a/an

The instruction used in a program for executing them is stored in the

A register file holds

The very first computer memory consisted of

A flip flop stores

Which one of the following has capability to store data in extremely high densities?

A large memory is compressed into a small one by using

The full form of PLD is

VLSI chip utilizes

CD-ROM refers to

Data stored in an electronic memory cell can be accessed at random and on demand

A ROM is defined as

Which of the following has the capability to store the information permanently?

ROM has the capability to perform

Since, ROM has the capability to read the information only then also it has been designed, why?

The ROM is a

ROM is made up of

Why are ROMs called non-volatile memory?

In ROM, each bit is a combination of the address variables is called

Which is not a removable drive?

In ROM, each bit combination that comes out of the output lines is called

VLSI chip utilizes

The time from the beginning of a read cycle to the end of tACS/tAA is called as

Why did PROM introduced?

Which of the following is programmed electrically by the user?

PROMs are available in

How many 8 k × 1 RAMs are required to achieve a memory with a word capacity of 8 k and a word length of eight bits?

Which of the following best describes the fusible-link PROM?

Which part of a Flash memory architecture manages all chip functions?

How much locations an 8-bit address code can select in memory?

What is a fusing process?

326.	A large memory is compressed into a small one by using
A.	lsi semiconductor
B.	vlsi semiconductor
C.	cdr semiconductor
D.	ssi semiconductor
Answer» B. vlsi semiconductor

327.	The full form of PLD is
A.	programmable large device
B.	programmable long device
C.	programmable logic device
D.	programmable lengthy device
Answer» C. programmable logic device

328.	VLSI chip utilizes
A.	nmos
B.	cmos
C.	bjt
D.	all of the mentioned
Answer» D. all of the mentioned

329.	CD-ROM refers to
A.	floppy disk
B.	compact disk-read only memory
C.	compressed disk-read only memory
D.	compressed disk- random access memory
Answer» B. compact disk-read only memory

330.	Data stored in an electronic memory cell can be accessed at random and on demand
A.	erom
B.	ram
C.	prom
D.	eeprom
Answer» A. erom

331.	A ROM is defined as
A.	read out memory
B.	read once memory
C.	read only memory
D.	read one memory
Answer» C. read only memory

332.	Which of the following has the capability to store the information permanently?
A.	ram
B.	rom
C.	storage cells
D.	both ram and rom
Answer» B. rom

333.	ROM has the capability to perform
A.	write operation only
B.	read operation only
C.	both write and read operation
D.	erase operation
Answer» B. read operation only

334.	Since, ROM has the capability to read the information only then also it has been designed, why?
A.	for controlling purpose
B.	for loading purpose
C.	for booting purpose
D.	for erasing purpose
Answer» C. for booting purpose

335.	The ROM is a
A.	sequential circuit
B.	combinational circuit
C.	magnetic circuit
D.	static circuit
Answer» B. combinational circuit