Online courses for the ham radio license exams. free ham radio bumper sticker

NEW Extra Class Exam Question Pool

effective 7/01/2016 thru 6/29/2020

    Unseen questions
    Weak questions
    Review questions
    Learned questions
    Incorrect answer choices  

2016-E6C: Digital ICs: Families of digital ICs; gates; Programmable Logic Devices (PLDs)

2016-E6C01: What is the function of hysteresis in a comparator?

To prevent input noise from causing unstable output signals

To allow the comparator to be used with AC input signal

To cause the output to change states continually

To increase the sensitivity

2016-E6C02: What happens when the level of a comparator's input signal crosses the threshold?

The comparator changes its output state

The IC input can be damaged

The comparator enters latch-up

The feedback loop becomes unstable

2016-E6C03: What is tri-state logic?

Logic devices with 0, 1, and high impedance output states

Logic devices that utilize ternary math

Low power logic devices designed to operate at 3 volts

Proprietary logic devices manufactured by Tri-State Devices

2016-E6C04: What is the primary advantage of tri-state logic?

Ability to connect many device outputs to a common bus

Low power consumption

High speed operation

More efficient arithmetic operations

2016-E6C05: What is an advantage of CMOS logic devices over TTL devices?

Lower power consumption

Differential output capability

Lower distortion

Immune to damage from static discharge

2016-E6C06: Why do CMOS digital integrated circuits have high immunity to noise on the input signal or power supply?

The input switching threshold is about one-half the power supply voltage

Larger bypass capacitors are used in CMOS circuit design

The input switching threshold is about two times the power supply voltage

Input signals are stronger

2016-E6C07: What best describes a pull-up or pull-down resistor?

A resistor connected to the positive or negative supply line used to establish a voltage when an input or output is an open circuit

A resistor in a keying circuit used to reduce key clicks

A resistor that insures that an oscillator frequency does not drive lower over time

A resistor connected to an op-amp output that only functions when the logic output is false

2016-E6C08: In Figure E6-5, what is the schematic symbol for a NAND gate?





2016-E6C09: What is a Programmable Logic Device (PLD)?

A programmable collection of logic gates and circuits in a single integrated circuit

A device to control industrial equipment

Programmable equipment used for testing digital logic integrated circuits

An algorithm for simulating logic functions during circuit design

2016-E6C10: In Figure E6-5, what is the schematic symbol for a NOR gate?





2016-E6C11: In Figure E6-5, what is the schematic symbol for the NOT operation (inverter)?





2016-E6C12: What is BiCMOS logic?

An integrated circuit logic family using both bipolar and CMOS transistors

A logic device with two CMOS circuits per package

A FET logic family based on bimetallic semiconductors

A logic family based on bismuth CMOS devices

2016-E6C13: Which of the following is an advantage of BiCMOS logic?

It has the high input impedance of CMOS and the low output impedance of bipolar transistors

Its simplicity results in much less expensive devices than standard CMOS

It is totally immune to electrostatic damage

All of these choices are correct

2016-E6C14: What is the primary advantage of using a Programmable Gate Array (PGA) in a logic circuit?

Complex logic functions can be created in a single integrated circuit

Many similar gates are less expensive than a mixture of gate types

A PGA contains its own internal power supply

All of these choices are correct

Color key:
● = Unseen
● = Weak
● = Review
● = Learned
● = Incorrect answer
Previous group:
2016-E6B: Diodes
Back to index:
NEW Extra Class Exam Question Pool
Next group:
2016-E6D: Toroidal and Solenoidal Inductors: permeability, core material, selecting, winding; transformers; Piezoelectric devices
Home     What is ham radio?     Which exam to take?     Study tips     Where to take the exam?     Frequency Asked Questions (FAQ)     How to     How much math?     Trouble with practice exams     Feedback     Prices     Ham It Forward     Free Extra course for active volunteer examiners     Refund policy     Privacy policy    Terms and conditions     Bumper sticker     Advertise with us     The Ham band     Rate us     Question pools     Course structure     Survivalists     Documents     facebook     Google+     Contact us     Christina's story     TestOnline     Links

The best study method, customer support, and guarantee in the industry!

A TestOnline website.  Copyright © 1998-2016, HamTestOnline™.  All rights reserved.