ATT TEST 8 LATEST EXAM WITH QUESTIONS AND
VERIFIED CORRECT ANSWERS/ ALREADY GRADED A++
When a feedback line is used in a logic (digital) circuit, it is called a
_________ - ANSWER Sequential citcuit
What is a WORD? - ANSWER A complete piece of digital data
Flip flops store information by using what? - ANSWER Feedback from
output gates to input gates
What part of the clock pulse is used to level trigger a flip flop? - ANSWER
Low pulse width
What is the purpose of a register? - ANSWER To store and transfer data
How does the logic probe indicate a high signal? - ANSWER By a red led
Integrated circuits were made possible by the invention of what? -
ANSWER Semiconductor devices
What are 3 common features in all IC's? - ANSWER Pins, parts number,
pin indicator
Which IC family has the lowest power rating? - ANSWER CMOS
Which IC family has the fastest switching speed? - ANSWER ECL
Which IC family has the lowest power requirements? - ANSWER CMOS
Which IC family has input/output voltages of 0V-15V? - ANSWER CMOS
What is the advantage of TTL over ECL? - ANSWER Lower power
What is the purpose of a decimal encoder? - ANSWER Convert decimal
numbers to binary outputs
What circuit converts binary numbers to outputs that represent
alphanumeric characters? - ANSWER Binary decoder
,Why are ESDs so sensitive to static electricity? - ANSWER They normally
operate at very low current and voltage levels
What does a basic digital circuit look for? - ANSWER The presence or
absence of a signal
The presence of a signal is classified by: 5 volts/high/true/on. What is the
absence classified by? - ANSWER 0 volts/low/false/off
How are digital circuits classified? - ANSWER level of integration and by
function
How many gates does small scale integration have? (SSI) - ANSWER less
than 12 gates
How many gates does medium scale integration have? (MSI) - ANSWER
12-99 gates
How many gates does large scale integration have? (LSI) - ANSWER 100-
9,999 gates
How many gates does very large scale integration have? (VLSI) -
ANSWER 10,000-99,999
How many gates does ultra large scale integration have? (ULSI) -
ANSWER 100,000+ gates
What are the 3 basic functions of a buffer? - ANSWER Protection, driver,
switching
How many volts indicates a low? - ANSWER 0-.8
How many volts indicates a high? - ANSWER 2 or more
What is indicated by voltage between .8-2? - ANSWER a float
How are ICs classified? (SSI, MSI, LSI....) - ANSWER By the number of
gates
, What is not normally used as a wire deposit on the wafer? - ANSWER Iron
When does an AND gate produce a high? - ANSWER When both inputs
are high
What does a NAND gate produce when both inputs are high? - ANSWER A
low output
What does a NOR gate produce when all inputs are low? - ANSWER A
high output
What does a NOR gate produce when there is a high input? - ANSWER A
low output
When does an XOR gate produce a high? - ANSWER When an odd
number of inputs are high
When does an XOR gate produce a low? - ANSWER When all inputs are
low or an even number are high
What is the output of an NXOR when the inputs are opposite? - ANSWER
A low
What is the output of an NXOR when the inputs are the same? - ANSWER
A high
What are 3 common faults in digital systems? - ANSWER open signal lines,
shorted signal lines, faulty power supply
Which internal IC fault can produce signals with 3 different voltages? -
ANSWER Shorts between pins
What is used to determine the amount of current drawn from a power
supply? - ANSWER A multimeter
What is a characteristic of shorts? - ANSWER Excessive heat
What function is produced when 3 NAND gates are connected? - ANSWER
OR
VERIFIED CORRECT ANSWERS/ ALREADY GRADED A++
When a feedback line is used in a logic (digital) circuit, it is called a
_________ - ANSWER Sequential citcuit
What is a WORD? - ANSWER A complete piece of digital data
Flip flops store information by using what? - ANSWER Feedback from
output gates to input gates
What part of the clock pulse is used to level trigger a flip flop? - ANSWER
Low pulse width
What is the purpose of a register? - ANSWER To store and transfer data
How does the logic probe indicate a high signal? - ANSWER By a red led
Integrated circuits were made possible by the invention of what? -
ANSWER Semiconductor devices
What are 3 common features in all IC's? - ANSWER Pins, parts number,
pin indicator
Which IC family has the lowest power rating? - ANSWER CMOS
Which IC family has the fastest switching speed? - ANSWER ECL
Which IC family has the lowest power requirements? - ANSWER CMOS
Which IC family has input/output voltages of 0V-15V? - ANSWER CMOS
What is the advantage of TTL over ECL? - ANSWER Lower power
What is the purpose of a decimal encoder? - ANSWER Convert decimal
numbers to binary outputs
What circuit converts binary numbers to outputs that represent
alphanumeric characters? - ANSWER Binary decoder
,Why are ESDs so sensitive to static electricity? - ANSWER They normally
operate at very low current and voltage levels
What does a basic digital circuit look for? - ANSWER The presence or
absence of a signal
The presence of a signal is classified by: 5 volts/high/true/on. What is the
absence classified by? - ANSWER 0 volts/low/false/off
How are digital circuits classified? - ANSWER level of integration and by
function
How many gates does small scale integration have? (SSI) - ANSWER less
than 12 gates
How many gates does medium scale integration have? (MSI) - ANSWER
12-99 gates
How many gates does large scale integration have? (LSI) - ANSWER 100-
9,999 gates
How many gates does very large scale integration have? (VLSI) -
ANSWER 10,000-99,999
How many gates does ultra large scale integration have? (ULSI) -
ANSWER 100,000+ gates
What are the 3 basic functions of a buffer? - ANSWER Protection, driver,
switching
How many volts indicates a low? - ANSWER 0-.8
How many volts indicates a high? - ANSWER 2 or more
What is indicated by voltage between .8-2? - ANSWER a float
How are ICs classified? (SSI, MSI, LSI....) - ANSWER By the number of
gates
, What is not normally used as a wire deposit on the wafer? - ANSWER Iron
When does an AND gate produce a high? - ANSWER When both inputs
are high
What does a NAND gate produce when both inputs are high? - ANSWER A
low output
What does a NOR gate produce when all inputs are low? - ANSWER A
high output
What does a NOR gate produce when there is a high input? - ANSWER A
low output
When does an XOR gate produce a high? - ANSWER When an odd
number of inputs are high
When does an XOR gate produce a low? - ANSWER When all inputs are
low or an even number are high
What is the output of an NXOR when the inputs are opposite? - ANSWER
A low
What is the output of an NXOR when the inputs are the same? - ANSWER
A high
What are 3 common faults in digital systems? - ANSWER open signal lines,
shorted signal lines, faulty power supply
Which internal IC fault can produce signals with 3 different voltages? -
ANSWER Shorts between pins
What is used to determine the amount of current drawn from a power
supply? - ANSWER A multimeter
What is a characteristic of shorts? - ANSWER Excessive heat
What function is produced when 3 NAND gates are connected? - ANSWER
OR
