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DIGITAL LOGIC FAMILIES

Total questions: 56

Worksheet time: 28mins

Name
Class
Date
1.

(RTL) RTL is the earliest form of logic circuit that primarily uses:

a)

Diodes only

b)

Transistors and resistors

c)

MOSFETs and capacitors

d)

BJTs and op-amps

2.

(RTL) The most common RTL gate is:

a)

NAND

b)

NOR

c)

AND

d)

OR

3.

(RTL) Typical supply voltage for RTL is around:

a)

5V

b)

3.6V

c)

12V

d)

15V

4.

(RTL) RTL circuits were used in:

a)

Early computers like Apollo Guidance Computer

b)

Smart sensors

c)

CMOS VLSI chips

d)

Fiber optic links

5.

(RTL) RTL suffers mainly from:

a)

Low power dissipation

b)

High speed

c)

High power consumption

d)

Infinite fan-out

6.

(RTL) The logic operation in RTL is mainly:

a)

NAND

b)

NOR

c)

EX-OR

d)

AND

7.

(RTL) In RTL, the output HIGH voltage depends on:

a)

Base resistance

b)

Number of driven gates (fan-out)

c)

Emitter resistor

d)

Temperature

8.

(RTL) RTL was replaced by:

a)

TTL

b)

CMOS

c)

DTL

d)

I²L

9.

(DTL) DTL was developed to replace:

a)

TTL

b)

RTL

c)

CMOS

d)

I²L

10.

(DTL) The basic logic gate implemented by DTL is:

a)

AND

b)

NOR

c)

NAND

d)

XOR

11.

(DTL) The diodes in DTL are used for:

a)

Amplification

b)

Logical decision (ANDing)

c)

Bias stabilization

d)

Oscillation

12.

(DTL) When both inputs are LOW, output is:

a)

HIGH

b)

LOW

c)

Undefined

d)

Floating

13.

(DTL) DTL improves over RTL mainly by:

a)

Using capacitors

b)

Improving noise immunity

c)

Reducing propagation delay

d)

Increasing fan-out

14.

(DTL) Typical propagation delay of DTL is:

a)

5–10 ns

b)

30–80 ns

c)

1 ns

d)

150 ns

15.

(DTL) The transistor in DTL acts as:

a)

OR gate

b)

NOT gate

c)

Amplifier

d)

Comparator

16.

(DTL) DTL was replaced by:

a)

CMOS

b)

TTL

c)

ECL

d)

HTL

17.

(TTL) TTL stands for:

a)

Transistor–Tunneling Logic

b)

Transistor–Transistor Logic

c)

Two-Transistor Logic

d)

Triple Transistor Logic

18.

(TTL) Basic logic gate in TTL:

a)

NOR

b)

AND

c)

NAND

d)

OR

19.

(TTL) Typical supply voltage of TTL:

a)

3V

b)

5V

c)

15V

d)

9V

20.

(TTL) TTL operates with propagation delay around:

a)

100 ns

b)

10–30 ns

c)

1 ns

d)

200 ns

21.

(TTL) TTL IC series labeled as:

a)

54xx and 74xx

b)

40xx

c)

60xx

d)

80xx

22.

(TTL) Fan-out refers to:

a)

Voltage regulation

b)

Number of loads an output can drive

c)

Heat dissipation

d)

Power factor

23.

(TTL) Wired-AND logic uses:

a)

Open-collector outputs

b)

Pull-down resistor

c)

Feedback capacitor

d)

Coupled transformer

24.

(TTL) Typical fan-out of standard TTL:

a)

5

b)

10

c)

50

d)

100

25.

(Schottky TTL) Schottky TTL uses:

a)

MOSFETs

b)

Schottky diodes across transistor junctions

c)

Varactors

d)

Tunnel diodes

26.

(Schottky TTL) The purpose of Schottky diode is to:

a)

Increase saturation

b)

Prevent deep saturation

c)

Reduce base current

d)

Increase leakage current

27.

(Schottky TTL) Propagation delay of Schottky TTL is:

a)

10 ns

b)

2–4 ns

c)

30 ns

d)

100 ns

28.

(Schottky TTL) Schottky TTL operates on:

a)

3.3V

b)

5V

c)

12V

d)

15V

29.

(Schottky TTL) 5400 series TTL is for:

a)

Consumer electronics

b)

Military use

c)

Automotive

d)

Education

30.

(Schottky TTL) 7400 series TTL is for:

a)

Industrial

b)

Military

c)

Commercial

d)

Aerospace

31.

(Schottky TTL) Low Power Schottky TTL represented as:

a)

74S

b)

74LS

c)

54F

d)

54AS

32.

(Schottky TTL) Advanced Schottky TTL provides:

a)

Slow operation

b)

Higher speed with more power

c)

Low voltage

d)

Higher impedance

33.

(DCTL) DCTL stands for:

a)

Differential Capacitive Transistor Logic

b)

Direct-Coupled Transistor Logic

c)

Double-Collector Transistor Logic

d)

Diode-Coupled Transistor Logic

34.

(DCTL) DCTL eliminates:

a)

Diodes

b)

Biasing resistors

c)

Inductors

d)

Capacitors

35.

(DCTL) DCTL gates are based on:

a)

NAND

b)

NOR

c)

XOR

d)

AND

36.

(DCTL) Current hogging occurs when:

a)

Voltage exceeds breakdown

b)

One transistor draws excess current

c)

Supply voltage drops

d)

All transistors switch together

37.

(DCTL) DCTL circuits are prone to:

a)

High noise margin

b)

Low noise margin (~0.1–0.2V)

c)

High input impedance

d)

High power loss

38.

(DCTL) DCTL’s major advantage is:

a)

Low speed

b)

Compactness and simplicity

c)

Expensive fabrication

d)

Large power dissipation

39.

(DCTL) Common application of DCTL:

a)

Large computers

b)

Analog amplifiers

c)

Filters

d)

Communication systems

40.

(DCTL) DCTL evolved into:

a)

TTL

b)

I²L

c)

DTL

d)

CMOS

41.

(I²L) I²L is derived from:

a)

ECL

b)

DCTL

c)

TTL

d)

CMOS

42.

(I²L) Key concept of I²L is:

a)

Voltage injection

b)

Current injection

c)

Capacitive coupling

d)

Transformer feedback

43.

(I²L) I²L uses:

a)

Multi-collector NPN transistors and PNP current injectors

b)

Diodes and resistors

c)

FETs and capacitors

d)

Relays

44.

(I²L) I²L best suited for:

a)

Low-speed circuits

b)

LSI and MSI applications

c)

Power amplifiers

d)

Analog converters

45.

(I²L) I²L power dissipation is:

a)

High

b)

Moderate

c)

Low

d)

Variable

46.

(I²L) I²L inverter uses:

a)

Bipolar junction transistors

b)

MOSFETs

c)

Vacuum tubes

d)

SCRs

47.

(I²L) I²L used in:

a)

Microcontrollers and memory circuits

b)

Radio frequency amplifiers

c)

LED drivers

d)

AC regulators

48.

(I²L) Main advantage of I²L fabrication:

a)

Complex process

b)

Simple, low-cost, high-density design

c)

Requires many resistors

d)

Needs large die area

49.

(ECL) ECL is known for being:

a)

Slowest

b)

Fastest logic family

c)

Lowest power

d)

Most economical

50.

(ECL) Transistors in ECL operate in:

a)

Saturation

b)

Active region (never saturate)

c)

Cutoff

d)

Breakdown

51.

(ECL) Typical propagation delay of ECL:

a)

10

b)

Zero

c)

Very high (>10)

52.

(ECL) ECL uses emitters that are:

a)

Coupled together

b)

Isolated

c)

Bypassed

d)

Grounded individually

53.

(ECL) ECL avoids saturation to:

a)

Save power

b)

Eliminate storage delay

c)

Increase voltage margin

d)

Reduce temperature effects

54.

(HTL) HTL operates at higher voltages (~):

a)

3.6V

b)

5V

c)

15V

d)

1.8V

55.

(HTL) HTL’s main advantage is:

a)

Speed

b)

High noise immunity

c)

Small size

d)

Low voltage operation

56.

(HTL) HTL uses ______ instead of diodes for thresholding:

a)

LEDs

b)

Zener diodes

c)

Schottky diodes

d)

Varactors