computer principles.docx

8/14/2019 Computer principles.docx

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ComputerPrinciples QuestText Choice1 Choice2 Choice3 Choice4 Subj

A ____ is an arithmetic circuit that generatesthe binary sum of the 3 binary digits

full adder half subtractor full subtractor half adder ComputerPrinciples

A (n) is the most effective piece of equipmentfor detecting short circuit problems

current tracer logic pulser oscilloscope logic probe ComputerPrinciples

A ____ is the most efficient pi ece of testequipment to use when examining a digitalwaveforms

oscilloscope logic pulser current tracer logic clip ComputerPrinciples

A chart that list all possible inputcombination and resultant output is called a

truth table decision table logic symbol listing polarity magnitudelisting

ComputerPrinciples

A circuit that stores a fix set of information ROM flip-flop RAM DRAM ComputerPrinciples

A combinational logic circuit that accepts nunique input lines and 2^n unique outputlines

decoder encoder SLC CLC ComputerPrinciples

A decimal digit is called dit decimal byte bit ComputerPrinciples

A digital logic device used as buffer shouldhave what input /output characteristic?

high input impedance and lowoutput impedance

low input impedance andlow output impedance

high input impedance andhigh output impedance

low input impedanceand high outputimpedance

ComputerPrinciples

A flip-flop that ignores the pulse while it is atconstant level but triggers only during thenegative transition of the clock signal

negative edge triggered edge triggered positive edge triggered t flip-flop ComputerPrinciples

A graphical representation of a state table. state diagram transition table state equations state assignments ComputerPrinciples

A logic pulser generates a _____. a single pulse or a pulse train high logic level a single pulse pulse train ComputerPrinciples

A magnitude comparator has 2^2n entries inthe truth table where n=___

number of inputs number of comparator bits number of outputs number inputs andoutputs

ComputerPrinciples

A memory element that temporarily stores RAM ROM PROM EPROM Computer


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the information. Principles

A memory register allows access to specificmemory locations and its number of bits(width) is determined by

number of bits in the addressbus

number of specific memorylocations

addresses for input andoutput ports

all of these ComputerPrinciples

A mnemonics designation is one which is all of these an alphabetical abbreviation easy to understand related to certain keywords

ComputerPrinciples

A process in which the flip-flops state staysindefinitely until directed by an input signalto change states

latching clocking timing delaying ComputerPrinciples

A Synchronous Logic circuit that goes througha binary sequence of states.

binary counter counter BCD counter registers ComputerPrinciples

A system that is added to a CLC to form asequential logic circuit

RAM ROM Storage counter ComputerPrinciples

A T flip-flop can be constructed by connectingthe inputs of a ___ flip-flop

JK SR RS D ComputerPrinciples

A truth table for a digital logic circuit with 3inputs will have how many inputcombinations

8 10 4 2 ComputerPrinciples

An n bit binary parallel adder requires ____ inthe design

n full addres n half addres n half subtractors n half adder and n fulladder

ComputerPrinciples

Arithmetic instructions are classified asinstructions which

add, subtract, multiply ordivide data

add, subtract increment ordecrement data

arithmetically moved datainto the accumulator

accumulate data in theaccumulator

ComputerPrinciples

digital multiplexer conventional sizespecification is

2^n x 1 n x 2^n 2^n x n 1 x 2^n ComputerPrinciples

Encoders are combinational logic circuits thataccepts one or more inputs and

produce a coded output signal develop an encoder priority generate an ASCII codedoutput


Exclusive-OR logic gates can be constructedfrom what other logic gates

AND, OR and NOT gates OR gates only OR and NOT gates AND NOT gates ComputerPrinciples

For what condition is the output of the OR when both inputs are high when one input is low and when both inputs are low never, there is no Computer


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logic function different from the output of anXOR logic functions

the other input is high difference in the output Principles

How many NAND circuits are contained in a7400 quad two-input NAND IC


In designing a 16 x 1 multiplexer how manyselection lines are needed


In designing at 8 x 2 ROM how many inputlines are needed


Input/output instructions are classified asinstruction which

control input and outputdevices

compare input and outputdevice data

process input and outputdevice data

change input andoutput devices

ComputerPrinciples

LS TTL logic gates exhibit lower ___ andhigher ____ than the standard TTL devices

power,speed supply voltage and cost cost, speed none of the above ComputerPrinciples

Of the following examples, choose the onethat represents negative logic

0 volt equals 0, -10 v equals 1 -15 v equals 0, -10 v equals 1 -10 v equals 1, -15 v equals 0 -5 v equals 0, 0 v equals1

ComputerPrinciples

There are ___ flip-flops for a 3 bit binarycounter.


The L series of TTL gates dissipates lesspower because the internal resistors have

____ value of resistance that other TTL seriesgates

larger smaller the same none of the above ComputerPrinciples

the master timing signal in a digital IC systemis called ____ signal

clock dynamic frequency period ComputerPrinciples

The mother flip-flop since most of the otherflip-flops is constructed from it

RS JK T D ComputerPrinciples

The output of a NOR gate will be HIGH underwhich of the following conditions

when all inputs are LOW when all inputs are HIGH when one input is HIGH when one input is LOW ComputerPrinciples

The popular 4-line-to-10-line decoderactually performs what function

converts four line of code into10 lines

convert 4 lines of binary intodecimal

converts 4 bit binary intodecimal number


The program counter and address register the program counter steps to the program counter the program counter counts all of these Computer


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work together so that the next instruction using theaddress register to keep track

addresses the nextinstruction

the next instruction and storesit in the address register

Principles

The state of the flip-flop before theoccurrence of the clock pulse.

present state next state current input present input ComputerPrinciples

The term used to describe the input ofdecoders in MSI circuit

word address keying logic ComputerPrinciples

TTL, ECL and IIL are all examples of ____digital logic devices

bipolar MOS NMOS PMOS ComputerPrinciples

What are the symptoms of an internal ICshort circuit?

the circuit input or output isstucked at either a low or highlogic level

the circuit input is stucked ata low logic level

either the circuit input oroutput is stucked at high logiclevel

either the circuit inputor putput is stucked atlow logic level

ComputerPrinciples

What combination of digital IC testequipment is most efficient for isolatinginternal IC open circuit problems

a logic pulser and a logic probe a logic pulser and a logic clip a logic probe and anoscilloscope

a current tracer and anoscilloscope

ComputerPrinciples

What combination of test equipment is mosteffective at isolating an external short circuiton a printed circuit board containing digitallogic Ics?

a logic pulser and a currenttracer

an oscilloscope and a logicclip

a logic pulser and amultimeter

an oscilloscope and amultimeter

ComputerPrinciples

What input conditions will result in lowoutput form for an OR gate

no inputs are high atleast one input is low all inputs are high one or more inputs arehigh

ComputerPrinciples

What input values will cause an AND logicgate to produce a high output

all inputs are high at least one input is low all inputs are low at least one input ishigh

ComputerPrinciples

What is required when interfacing twodifferent logic families

a buffer an inverter a level shifter a phase splitter ComputerPrinciples

What is the purpose of a decoders input both a and c to allow the decoder torespond to the inputs to

activate the correct outputgate

to disable the decoderoutputs so that all outputs will

be inactive

to disable the inputsand activate all outputs

ComputerPrinciples

What two quantities mist be compatible both power and impedance only the current only the voltage both current and Computer


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computer principles.docx

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