Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

electronics > exam questions > Flashcards

exam questions Flashcards

1
Q

If an LED has a 2v drop in a 4.5v circuit. How much voltage?

A

2.5v

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

why are IC sockets useful

A
  1. stops component from being damaged by soldering.
  2. the IC is easily removable to swap or change if in the wrong orientation.
  3. easier to replace a faulty chip
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

what is bistable

A

a latching device with 2 stable states (high or low, on or off)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

in a decade counter where is the enable pin connected

A

connected low

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Uses of CAD

A
  1. testing the idea to see if the components are connected correctly and have the right values.
  2. Designing the circuit in circuit wizard.
  3. Lets a person visualise their design and or circuit idea that can be sent direct to a printer, cnc or cad.
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

what does a potentiometer do?

A

adjust voltage and resistance to set light/heat level for sensors.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

3 legs of an FET

A

gate, drain, source

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

3 legs of a transistor

A

base, collector, emmiter

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

3 legs of a thyristor

A

gate, anode, cathode

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

advantages of rapid prototyping

A
  1. complex 3 d shapes made, they can be amended if needed.
  2. made from a 3d drawing
  3. complex components are produced quickly.
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

How does vacuum forming work

A 
Material clamped into place
Heat applied
Former raised into material
Vacuum pump switched on
Pump off / table lowered
Formed shape removed
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

voltage for a microconrtoller

A

5v

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

voltage regulator purpose

A

to stabilise the voltage for a circuit so it doesn’t damage any components

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

purpose of a darlington pair

A

to go from a low current device to a high current output like a speaker from a microcontroller.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

uses for standards in manufacture

A
  1. upholds reputation so sell more.

2. to make sure there is no fault which will need to be compensated.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

advantages of pick and place component machines

A

much faster than humans

need for less employees so save money

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

what a thyristor

A

a latching component which stays on even once currents stop being applied.

18
Q

why is a diode used?

A

protect from back emf

protect components

19
Q

what is a pull down resistor

A

connects input low, so prevents accidental triggering

20
Q

what is switch bounce?

A

Several pulses produced from each press of the switch

21
Q

how to stop switch bounce

A

using a debouncer circuit/ monostable to create a clean signal

22
Q

advantages of injection moulding for high production

A

low skilled workers needed
mould can be re used
low cost for each component

23
Q

3 things that improve a vacuum forming mould

A

rounded corners, vent holes and filleted joints

24
Q

monostable works by

A

pin 2 connecting low, circuit triggered.
pin 3 high then low until pin 6 is measuring how full capcitor
pin 7 discharges
output turn on for this time delay

25
Q

astable

A

same as mono but pin 2 is triggered by discharge of pin 6

26
Q

capacitor polarised sides are shown by

A

long and short lead

minus sign

27
Q

how can voltage drop be measured

A

by a multi meter

28
Q

how to use a multi meter

A

select v range
attach a lead to anode and cathode
connect probes either side of the componet
take a reading

29
Q

prototypes are

A

working models made in development stages

30
Q

resistors

A

used for pulling high and low and to protect componets from too much current

31
Q

benifits of packaging a darlington pair in 1 component

A

fewer components so reliable

smaller circuit board

32
Q

function of an astable

A

to create a flashing output bby being a pulse generator

33
Q

digital signal

A

2 states on or off

34
Q

anologue signal

A

varying signal

35
Q

advantages of a microcontroller

A

wide range of features
programmable
adaptive inputs and outputs

36
Q

one off product

A

specialised, complex
made for 1 client
only 1 made
expensive to produce

37
Q

high volume production

A

tooling required to be set up once.
skilled workforce isnt needed
made in big quantities

38
Q

advantages to seven segment display to an led

A

looks better
easier solder cos less legs
Single component so not many components

39
Q

what is a one of product

A

a singular product complex ans specialised. requires a skilled workforce and time and money

40
Q

high volume productions

A

many products are made. low skilled workforce

41
Q

what is a prototype

A

working model consisting of the correct measurements used as a real world testing

electronics (1 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions