Module 4 Round 2 Flashcards
What is the name transistor short for
Transfer resistor
What are the two main categories of transistors
Bipolar and field effect
What 3 parts make up a transistor
The emitter
The base (the middle layer)
The collector (last layer)
What is the purpose of the first layer (the emitter) in a transistor
It Emmitts charge carriers
What is the purpose of the middle layer (the base) of the transistor
To regulate the charge carriers
What is the purpose of the last layer (the collector) in a transistor
The collector collects the charges
What is the principle function of a transistor
The current flowing out of a transistor must be equal to the currents flowing in
What are integrated circuits (IRS)
Arrangements of several electronic components in a common housing
What is the biggest advantage of IRS
The very high density of the components and the arrangements making them very compact
What components normally make up an IR
- Semiconductors
- Resistors
- Capacitors
Why can’t inductances be integrated in IR’s
Due to their large space requirements
Can IR’s be found in analogue or digital devices
Both
What do operational amplifiers normally consist of
Several different stages
What is the input stage of an operational amplifier
A differential amplifier
What is the output stage of an operational amplifier normally
A push pull power amplifier
What sort of current can operational amplifiers amplify
AC and DC
What are operational amplifiers also known as
Op Amps
What is open loop gain
Infinite
What are the benefits of PCBs
- robust physical strength
- cheap
- easy to manufacture
What is the most common types of base materials of PCBs
Laminated paper
What happens during the subtractive process
Boards laminated with copper on one or both sides
What is the biggest disadvantage of the subtractive manufacturing process
Only a small area of the board remains protected. Much of the copper is removed and it’s a waste of material
What are the two main types of servomechanisms
Synchros and resolvers
What are synchros and resolvers mainly used for
Electromechanical servo systems
What are synchros similar in construction to
AC generators
What are the main things in construction of synchros
A laminated stator core which carries 3 coils staggered by 120 degrees apart
Synchros are manufactured with a diameter between
0.5 and 3.7 inches
What type of voltages are synchros built for
Excitation voltages 26v or 115v 400hz
Where does the accuracy level lie for a synchro
Between plus or minus 4 and plus or minus 10 arc minutes
What is achieved with pancake synchros
Higher levels of accuracy
