Electronics
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1
Open loop vs closed loop control system
The output gives feedback to the input in a closed loop while that does not happen for open loop
2
What is Direct Current and its graph?
The direction of the current of the voltage is always constant
3
What is Alternating Current and its graph
The direction of the current is always switched periodically and the voltage is also switched
4
What types of devices can operate on AC
Home appliances such as refrigerators air conditioners etc
5
What are some devices that only operate on DC
Phones and digital clocks
6
What are the advantages of renewable power supplies
No harmful gases released into environment, resources are sustainable (will not be depleted) and are readily available
7
What are the disadvantages of renewable power supplies
Only works when source of energy is available, setup costs can be high and it isn’t suitable for all locations
8
What’s the circuit symbol for slide, rocker and toggle switches as well as their respective uses
Toys/ Torch; Lights/Electric kettle ; Control panels
9
What’s the circuit symbol for micro switch and push button and membrane panel switch as well as their respective uses
Limit switch/alarm sensor; door bell, energency stop button; computer keyboard/control panel button
10
What’s the difference between the switch on the left and the one on the right
Push to make vs push to break
11
What’s the circuit symbol for rotary switch and its use case
knobs for volume, fan speed etc
12
What’s the usecase of tilt switch
Robotics arm angle sensing, level sensing in forklift and changing of phone screen orientation
13
What is the usecase of reed switch
Burgalar alarm at door/window
14
What’s the classification of these 2 switches and their circuit symbols
With 2 and 3 pins respectively
15
What’s the circuit symbol for LED light
16
What’s the circuit symbol for buzzer
17
What’s the circuit symbol for motor
18
What’s the circuit symbol for solenoid
19
What’s the circuit symbol for relay
20
What’s the purpose of resistors
To control amount of current flow to protect component from being damaged from over-current
21
What’s the purpose of a multimeter
To measure resistance in a circuit
22
What’s the circuit symbol for fixed resistor
23
What’s the circuit symbol for variable resistor
24
What’s the circuit symbol for light dependent resistor
25
What’s the circuit symbol for thermistor
26
What is the circuit symbol for probe (moisture sensor)
27
Besides the circuit symbol, how else can you draw a probe (moisture sensor)
28
What is the layout of a basic sensing circuit?
29
What happens when current goes through say this circuit?
1. When LDR senses dark, Current cannot flow through the LDR (now LDR has HIGH resistance). 2. When LDR senses bright, LDR's resistance decreases. Current flows through LDR into base of transistor. 3. Transistor activates and acts like Closed Switch 4. Current can flow through light bulb (via the Collector & Emitter of Transistor) and light up light bulb.
30
Image occlusion: name the hidden labels
31
Image occlusion: name the hidden labels
32
Image occlusion: name the hidden labels
33
What is the layout of an adjustable sensing circuit
34
What is the layout of a reversed sensing circuit
35
How to make a sensing circuit where the output stays on even if the input only comes on momentarily?
Replace the transistor with a thyristor
36
What is the layout of a sensing circuit with a thyristor
37
What is method 1 of turning off a sensing circuit with a thyristor
38
What is method 2 of turning off a sensing circuit with a thyristor
39
What is the circuit symbol of a electrolytic capacitor
40
What is the circuit symbol of a non-electrolytic capacitor
41
What is the circuit symbol of a variable capacitor
42
What’s the layout of a timing and counting circuit
43
What’s the layout of a timing and counting circuit with a reset switch
44
What are the two operating modes of the 555 timer IC
Pulse generator (astable) & Time Delay (Monostable)