Dylins random exam Q's

Question 1

Where is a RC Filter used

Answer 1

Can be added where ripple must be held to a minumum

Question 2

What is the impedance and gain of a Power Amplifier Output

Answer 2

Low Impedance, High Current/Gain
3.4.2

Question 3

Most used/ simple transformer for phase splitting

Answer 3

Centre Tap transformer

Question 4

What does A-Stable mean

Answer 4

Cant stay in any stay, off wants to go on, on wants to go off

Question 5

A logarithm of 0.6 gives what unit?

Answer 5

4

Question 6

dBW measurement is compared to a reference level of ?

Answer 6

1 Watt

Question 7

Whats the application of a comparitor?

Answer 7

Controls the temp of a heater in a circuit

Question 8

Use for a transformer?

Answer 8

To step up or step down voltage

Question 9

4 units of a power supply?

Answer 9

Transformer, Recitifier, filter, regulator

Question 10

Purpose of a filter in a power supply

Answer 10

Eliminate the Ripple

Question 11

Op Amp stages

Answer 11

Differential Amplifier
High Gain Amplifier
Power Amplifier

Question 12

What are the requirements of barkhausen criteria ?

Answer 12

The feedback must be exactly one

Question 12

What is slew rate?

Answer 12

The amount the output changed compared to the

Question 13

Ideal op amp characteristics

Answer 13

Voltage Gain - Infinite
Bandwidth - Infinite
Input Impedance - Infinite
Output impedance - ZERO

Question 14

What is open loop gain?

Answer 14

Gain with no feedback

Question 15

Input resistance is generally between?

Answer 15

1MΩ to over 100 MΩ

Question 16

Schmitt trigger is a method of?

Answer 16

Creating a squared wave from an analogue

Question 17

Main advantage of a Transformer Coupling ?

Answer 17

Impedance matching
Phase splitting

Question 18

What is the power source/ input in a switch mode , switch regulator?

Answer 18

DC or AC input

Question 19

The fixed reference potential is supplied by what in a EMITTER-FOLLOWER REGULATOR

Answer 19

A zener Diode in series

Question 20

Purpose of a transformer core?

Answer 20

To provide low reluctance for the magnetic flux

Question 21

Purpose of a rectifier in a power supply

Answer 21

AC TO DC CONVERSION

Question 22

Purpose of a PWM?

Answer 22

To regulate and controls the value of average current/voltage to control an output

Question 23

Why is a two stage amplifier used for phase splitting?

Answer 23

As it can create two output signals that are 180 degrees out of phase

Question 24

How does a Bi-stable Multivibrator complete a full cycle ?

Answer 24

It must be triggered On & Off to produce a full output cycle

Question 25

How many states does an A-Stable multivibrator have?

Answer 25

Zero

Question 26

Does the complementary symmetry require phase split input?

Answer 26

NO

Question 27

In a Class A amplifier current flows for?

Answer 27

all 360 degrees of the input

Question 28

Requirements of an Oscillator output

Answer 28

Constant Frequency
Constant Amplitude
Waveform purity

Question 29

Does a Colpitts oscillator use split capacitance?

Answer 29

Yes