# MCQ in Computer Fundamentals Part 7 | ECE Board Exam

(Last Updated On: November 24, 2020)

This is the Multiple Choice Questions Part 7 of the Series in Computer Fundamentals as one of the Electronics Engineering topic. In Preparation for the ECE Board Exam make sure to expose yourself and familiarize in each and every questions compiled here taken from various sources including but not limited to past Board Exam Questions in Electronics Engineering field, Electronics Books, Journals and other Electronics References.

#### MCQ Topic Outline included in ECE Board Exam Syllabi

• MCQ in analog and Digital System
• MCQ in Binary Number System
• MCQ in Boolean Algebra
• MCQ in Mathematical Logic and Switching Networks
• MCQ in Basic digital Circuits (logic gates, flip-flops, multivibrators, etc)
• MCQ in Static and dynamic Memory Devices
• MCQ in Programming and Machine Languages
• MCQ in Information and Acquisition Processing
• MCQ in Analog / Digital Conversion
• MCQ in Computer Networking
Watch Audio MCQ in Computer Fundamentals Part 7

#### Continue Practice Exam Test Questions Part 7 of the Series

Choose the letter of the best answer in each questions.

301. Only when all inputs are logic one that this gate can deliver an output of logic one.

A. NOR gate

B. AND gate

C. NAND gate

D. XOR gate

Solution:

302. A solid state logical device which only gives a “1” output if all inputs are “0” is called a _________ gate.

A. NOT

B. NOR

C. NAND

D. OR

Solution:

303. To cause a three-state buffer to output 0-1 levels, the following must be true:

A. The output enable must be false

B. The output enable must be true

C. The information must have been stored in the buffer

D. The signal OE must be at logic 1

Solution:

304. The rapidly flashing logic probe tip tells you that the logic node being probe

A. Has rapidly changing logic activity

B. Is struck

C. Is at an illegal logic level

D. Has an unstable logic activity

Solution:

305. ______________ is a single bit comparator.

A. Wired OR

B. Exclusive OR

C. NOR gate

D. Exclusive NOR

Solution:

306. _____________ refers to the class of logic circuit containing flip-flops.

A. Combinational

B. Sequential

C. Linear

D. Feedback

Solution:

307. What is the counter that follows the binary sequence?

A. Binary counter

B. Simplex counter

C. Shift counter

D. Decimal counter

Solution:

308. What logic circuit is analogous to a single pole mechanical selector switch?

A. Decoder

B. Encoder

C. Multiplexer

D. Exclusive OR

Solution:

309. An encoder is an MSI (medium-scale-integrated) circuit that

A. Provides an output code that corresponds to which of a set of input line is true

B. Provides a storage of a certain number of binary bits

C. Selects a given output based on binary input code

D. Provides for delivering one of two or more inputs to an output

Solution:

310. _____________ is called the time sharing of one line with multiplex signals.

A. Simultaneous transmission

B. Bi-directional

C. Relay

D. Multiplexing

Solution:

311. Data selector is also called

A. Encoder

B. Decoder

C. Multiplexer

D. Demultiplexer

Solution:

312. _____________ refers to a function of a decade counter digital IC.

A. Provides one output pulse for every 10 inputs pulses

B. Adding two decimal numbers

C. Producing 10 output pulses for every 1 pulse

D. Decoding a decimal number for display on seven-segment

Solution:

313. ___________ refers to BCD counter:

B. Shift register

C. Frequency divider

D. Binary counter

Solution:

314. In a system with MOS devices, the main bus loading factor is likely to be

A. Resistive

B. Current

C. Capacitive

D. Static charge

Solution:

315. When a logic circuit rejects an unwanted signal, this is termed as ___________.

A. Logic levels

B. Noise margin

C. Power consumption

D. Propagation delay

Solution:

316. Speed of a logic circuit is normally expressed as _________.

A. Logic levels

B. Speed immunity

C. Propagation delay

D. Power consumption

Solution:

317. What is a multi-wire connection between digital circuits?

A. Bus

B. Wire wrap

C. Multiplexed cable

D. Cable ribbon

Solution:

318. What is the process used to describe analog-to-digital conversion?

A. Binarize

B. Linearize

C. Digitize

D. Analogize

Solution:

319. What is the process of converting multiple analog input signals sequentially to digital output?

A. Time division multiplexing

B. Analog to digital conversion

C. Space division multiplexing

D. Pulse code modulation

Solution:

320. What do you call a circuit that changes pure binary code into ASCII?

A. Decoder

B. Encoder

C. Demultiplexer

D. Code converter

Solution:

321. The output pulses of the logic pulser _________.

A. Can damage logic circuits

B. Are too many for the logic probe to respond to

C. Can only force high nodes to low

D. Can be used to overdrive logic nodes high or low

Solution:

322. Circuits used to implement Boolean expression or equations.

A. Logic gates/circuits

B. Digital circuits

C. Binary circuits

D. All of the above

Solution:

323. Logic gate whose output is HIGH when one or all of its inputs is LOW.

A. OR gate

B. NOR gate

C. AND gate

D. NAND gate

Solution:

324. What logic gate that generates an output of logic zero (LOW) only when all its inputs are logic one (HIGH)?

A. OR gate

B. NOR gate

C. AND gate

D. NAND gate

Solution:

325. Only when all inputs are LOW thus, this logic gate produces an output of HIGH.

A. NOR gate

B. NAND gate

C. AND gate

D. NOR and NAND

Solution:

326. A logic gate whose output is logic zero every time one of its inputs goes to logic one.

A. NOR gate

B. NAND gate

C. XOR gate

D. A and C

Solution:

327. Gate with HIGH output level every time one of its inputs goes LOW.

A. NOR gate

B. NAND gate

C. XNOR gate

D. B and C

Solution:

328. What logic gate that gives an output of logic one if there is an odd number of 1’s at the input?

A. NOR gate

B. NAND gate

C. XOR gate

D. XNOR gate

Solution:

329. Logic gate that gives a HIGH output when the input has an even number of 1’s.

A. NOR

B. NAND

C. XOR

D. XNOR

Solution:

330. A circuit that converts the input logic level to its complement.

A. Inverter

B. NOR gate with all inputs tied

C. NAND gate with all inputs tied

D. All of the above

Solution:

331. If the fan out of a logic gate is not enough, a/an ___________ should be used.

A. Inverter

B. Amplifier

C. Buffer

D. Isolator

Solution:

332. A buffer multiplies the number of gates a certain output can drive, and this can also be

used as a/an

A. Voltage follower

B. Current amplifier

C. Isolator

D. All of the above are correct

Solution:

333. Is considered as a controlled inverter.

A. XOR

B. NOR

C. NAND

D. AND

Solution:

334. A logic gate that can be wired to function like any other gate.

A. International gate

B. Flexible gate

C. Variable gate

D. Universal gate

Solution:

335. Known as universal gates.

A. OR and AND

B. AND and NAND

C. OR and NOR

D. NOR and NAND

Solution:

336. How many NAND-gates are needed to have an AND function?

A. 2

B. 3

C. 4

D. 5

Solution:

337. The number of NAND-gates needed to form an OT-gate.

A. 2

B. 3

C. 4

D. 5

Solution:

338. OR function can be achieved by suing how many NOR gates?

A. 2

B. 3

C. 4

D. 5

Solution:

339. Which of the following is the probable output if all inputs of a TTL gate are binary 1?

A. Determinable

B. Binary 0

C. Binary 1

D. Indeterminate

Solution:

340. Logic devices are broadly divided or categorized into two families, bipolar and MOS. What are the examples of bipolar?

A. RTL and DTL

B. IIL and ECL

C. TTL and HLDTL

D. All of the above

Solution:

341. CMOS, NMOS, and PMOS belong to MOS family, what is (are) the significance of these devices?

A. They have lower power dissipation than bipolar devices

B. They are generally slower than bipolar devices

C. They are most sensitive to electrostatic

D. All of the above

Solution:

342. Refers to the ability of logic circuit it withstand noise superimposed on its input signal.

A. LOW noise immunity

B. HIGH noise immunity

C. Noise immunity

D. Noise figure

Solution:

343. The number of logic gates of the same family that can be connected to the input of a particular gate without degrading the circuit performance.

A. Fan-in

B. Fan-out

C. Input-drive

D. Input noise immunity

Solution:

344. Refers to the number of logic gate of the same family that can be driven by a single output of a particular logic gate.

A. Output drive

B. Output noise margin

C. Fan-in

D. Fan-out

Solution:

345. A bipolar logic family that uses resistors as its input circuit.

A. RTL

B. DTL

C. ECL

D. TTL

Solution:

346. Logic family that uses diodes and transistors as its circuit elements. This logic family is more resistant to noise than RTL.

A. DTL

B. TTL

C. ECL

D. I2L or IIL

Solution:

347. A logic circuit family with a supply voltage of 25 V, and are generally used in industry where machinery causes electrical noise and large power line transients to occur.

A. HLDTL

B. 74HXX

C. NMOS

D. CMOS

Solution:

348. A variation of transistor-transistor-logic (TTL) wherein transistor’s base and collector junctions are clamped with a Schottky diode.

A. ECL

B. STTL

C. I2L

D. CML

Solution:

349. In a transistor-transistor logic (TTL), if the base collector junction of a transistor is clamped with a Schottky diode it becomes Schottky TTL. What is the significance of having this diode?

A. It increases the switching speed

B. It decreases the power dissipation

C. It increases the noise margin

D. It increases the fan-out

Solution:

350.Which of the bipolar logic circuits is the fastest?

A. TTL

B. STTL

C. SCTL

D. ECL

Solution:

#### Questions and Answers in Computer Fundamentals

Following is the list of multiple choice questions in this brand new series:

MCQ in Computer Fundamentals
PART 1: MCQ from Number 1 – 50                        Answer key: PART 1
PART 2: MCQ from Number 51 – 100                   Answer key: PART 2
PART 3: MCQ from Number 101 – 150                 Answer key: PART 3
PART 4: MCQ from Number 151 – 200                 Answer key: PART 4
PART 5: MCQ from Number 201 – 250                 Answer key: PART 5
PART 6: MCQ from Number 251 – 300                 Answer key: included
PART 7: MCQ from Number 301 – 350                 Answer key: included
PART 8: MCQ from Number 351 – 400                 Answer key: included
PART 9: MCQ from Number 401 – 450                 Answer key: included
PART 10: MCQ from Number 451 – 500                 Answer key: included