Digital Electronics - ECE Questions and Answers

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For checking the parity of a digital word, it is preferable to use

AND gates

NAND gates

EX-OR gates

NOR gates

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Among the digital IC families - ECL, TTL, and CMOS

ECL has the least propagation delay

TTL has largest fan out

CMOS has the lowest noise margin

TTL has the lowest power consumption

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In ASCII, letter B is coded as

1000001

1000010

100100

1001000

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The power dissipated per gate

is constant at all frequencies

increases with frequency

decreases with frequency

may increase or decrease with frequency

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In 8085 microprocessor, what is the memory word addressing capability?

32 K

64 K

256 K

512 K

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Gray code is used in devices which convert analog quantities to digital signal because it is

more error free

much simpler than binary code

superior to Excess-3 code

absolutely error free

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A transistor is operated as non-saturated switch to eliminate

turn on time

turn off time

storage time

delay time

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Which has the lowest propagation delay time?

ECL

TTL

CMOS

PMOS

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Programmable logic array uses

RAM matrices

ROMs matrices

PROM matrices

Silo memory