Et Att Test 6 Study Guide

Front 1

The most common fault in a FET circuit is?

Back 1

The FET

Front 2

When reverse biased, a low resistance measurement between the gate and source indicates what?

Back 2

A shorted source.

Front 3

A depletion mode MOSFET acts like a normally___________ circuit.

Back 3

Closed.

Front 4

Obvious physical difference between the construction of Depletion mode and enhancement mode MOSFET circuits is___________.

Back 4

The Depletion mode has a diffused channel.

Hint 4

(Enhancement mode shown)

Front 5

True or False: The MOSFET is similar to a capacitor because the source acts as one plate and the oxide (the dielectric) + the drain act as the other plate.

Back 5

False.

Front 6

The purpose of a sine wave oscillator is to convert________________.

Back 6

DC energy to sinusoidal AC energy.

Front 7

What type of feedback is required to produce oscillations?

Back 7

Regenerative feedback.

Front 8

When noise is applied, the output of the feedback circuit consists of_________.

Back 8

One frequency, determined by the feedback circuit.

Front 9

The purpose of a Hartley Oscillator is to convert__________.

Back 9

DC energy to sinusoidal AC energy.

Front 10

The purpose of a RC phase shift oscillator is to convert_______.

Back 10

DC energy to sinusoidal AC energy.

Front 11

Crystals are made from_________.

Back 11

A quartz slab mounted between two metal plates.

Front 12

Crystals used in oscillators exhibit________ effects.

Back 12

Piezoelectric

Front 13

RC phase shift and crystal oscillators are difficult to troubleshoot because______________.

Back 13

They use a feedback loop.

Front 14

Most faults in an oscillator result in_________.

Back 14

No output from the oscillator.

Front 15

What factor solely determines the output frequency of a sawtooth generator?

Back 15

Input frequency.

Front 16

A blocking oscillator is one that__________.

Back 16

Cuts off its own oscillations at a predetermined time.

Front 17

Which type of oscillator requires an input pulse to produce an output pulse?

Back 17

Triggered blocking oscillator.

Front 18

The transistors in a multivibrator are biased so that they are___________.

Back 18

Either in cutoff or saturation.

Front 19

In a multivibrator what is meant by a transistor being "on"?

Back 19

The transistor is in saturation.

Front 20

Free running multivibrator generate a square wave output__________.

Back 20

Anytime the operating voltage is applied.

Front 21

When a transistor in a multivibrator is on, it's output voltage is_______.

Back 21

Low.

Front 22

The purpose of an A-stable multivibrator is to_________.

Back 22

Convert DC energy to square wave energy.

Front 23

A monostable multivibrator has_________ stable state(s).

Back 23

1.

Front 24

The frequency of a monostable multivibrator is determined by__________.

Back 24

The input trigger frequency.

Front 25

Bistable multivibrators have_________ stable states.

Back 25

2.

Front 26

The frequency of a bistable multivibrator is determined by_____________.

Back 26

The input trigger frequency.

Front 27

Most faults in multivibrators result in____________.

Back 27

Either no output or a VCC level on the output.

Front 28

In an A-stable multivibrator, what determines which transistor turns on when power is first applied?

Back 28

The transistor that conducts first.

Front 29

What type of operation does a monostable multivibrator use?

Back 29

Triggered.

Front 30

The purpose of a Schmitt trigger is to_____________.

Back 30

Convert any input to constant amplitude pulses.

Front 31

The upper threshold level of a Schmitt trigger is determined by the_________.

Back 31

Circuit design.

Front 32

A Schmitt trigger produces a high output only when_________.

Back 32

The upper threshold level is exceeded.

Front 33

Schmitt triggers are also called________.

Back 33

Squaring amplifiers.

Front 34

Schmitt triggers produce an output pulse any time the input_____________.

Back 34

Exceeds the input threshold level.

Front 35

The purpose of an AM receiver is to____________.

Back 35

Receive radio waves.

Front 36

The frequency range of AM receivers is__________.

Back 36

535 to 1605 kHz.

(Note: KHz, not Hz. Both options are provided on test)

Front 37

The term AM stands for_________.

Back 37

Amplitude Modulation.

Front 38

The purpose of amplitude Modulation (AM) is to_____________.

Back 38

Transmit intelligence over long distances.

Front 39

Information in the form of music, voice, data, or video is called__________.

Back 39

Intelligence.

Front 40

If receiver is tuned to 1500 KHz, local oscillator frequency should be_____________.

Back 40

1955 KHz.

Front 41

When identifying a faulty function, what location should be the first measurement taken?

Back 41

The mid point between all functional blocks of the circuit.

Front 42

Sound waves cannot travel through a__________.

Back 42

Vacuum.

Front 43

The fundamental or first harmonic is the________ frequency that a string can make.

Back 43

Lowest.

Front 44

The normal range of frequencies that a human can hear is__________.

Back 44

20 to 20, 000 Hz.

Front 45

The unit of measurement for sound is________.

Back 45

Decibels.

Front 46

Which alarm has a continuous tone for the entire time in which the alarm is sounded?

Back 46

Chemical.

Front 47

What is the lowest priority alarm?

A: General

B: Collision

C: Chemical

D: Flight crash

Back 47

C: Chemical.