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PE4505 Flash Cards > Dylins random exam Q's > Flashcards

Dylins random exam Q's Flashcards

Possible/most likely exam questions

1
Q

Where is a RC Filter used

A

Can be added where ripple must be held to a minumum

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2
Q

What is the impedance and gain of a Power Amplifier Output

A

Low Impedance, High Current/Gain
3.4.2

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3
Q

Most used/ simple transformer for phase splitting

A

Centre Tap transformer

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4
Q

What does A-Stable mean

A

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

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5
Q

A logarithm of 0.6 gives what unit?

A

4

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6
Q

dBW measurement is compared to a reference level of ?

A

1 Watt

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7
Q

Whats the application of a comparitor?

A

Controls the temp of a heater in a circuit

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8
Q

Use for a transformer?

A

To step up or step down voltage

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9
Q

4 units of a power supply?

A

Transformer, Recitifier, filter, regulator

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10
Q

Purpose of a filter in a power supply

A

Eliminate the Ripple

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11
Q

Op Amp stages

A

Differential Amplifier
High Gain Amplifier
Power Amplifier

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12
Q

What are the requirements of barkhausen criteria ?

A

The feedback must be exactly one

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12
Q

What is slew rate?

A

The amount the output changed compared to the

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13
Q

Ideal op amp characteristics

A

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

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14
Q

What is open loop gain?

A

Gain with no feedback

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15
Q

Input resistance is generally between?

A

1MΩ to over 100 MΩ

16
Q

Schmitt trigger is a method of?

A

Creating a squared wave from an analogue

17
Q

Main advantage of a Transformer Coupling ?

A

Impedance matching
Phase splitting

18
Q

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

A

DC or AC input

19
Q

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

A

A zener Diode in series

20
Q

Purpose of a transformer core?

A

To provide low reluctance for the magnetic flux

21
Q

Purpose of a rectifier in a power supply

A

AC TO DC CONVERSION

22
Q

Purpose of a PWM?

A

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

23
Q

Why is a two stage amplifier used for phase splitting?

A

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

24
Q

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

A

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

25
Q

How many states does an A-Stable multivibrator have?

A

Zero

26
Q

Does the complementary symmetry require phase split input?

A

NO

27
Q

In a Class A amplifier current flows for?

A

all 360 degrees of the input

28
Q

Requirements of an Oscillator output

A

Constant Frequency
Constant Amplitude
Waveform purity

29
Q

Does a Colpitts oscillator use split capacitance?

A

Yes

PE4505 Flash Cards (6 decks)

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