CCEA A-Level Technology and Design AS 1 Electronic and Microelectronic Systems overview quiz quiz
14questions. Pick an answer and you'll see why right away.
In the systems approach, which subsystem converts a physical quantity such as light into an electrical signal?
What does negative feedback do in a temperature-control system?
A potential divider has output Vout across R2. Which formula is correct?
As the temperature rises, the resistance of an NTC thermistor:
A bipolar transistor has hFE = 200 and needs a collector current of 40 mA. What is the minimum base current?
A flyback (freewheeling) diode is fitted across a relay coil to:
Used as a comparator, an op-amp drives its output high when:
An inverting amplifier has Rf = 100 kilohm and Rin = 20 kilohm. Its voltage gain is:
Which logic gate gives an output of 1 only when all its inputs are 1?
Why are NAND and NOR called universal gates?
A 555 timer in monostable mode produces:
A 555 monostable has R = 200 kilohm and C = 10 microfarad. The output pulse length is about:
An LED has a forward voltage of 2.0 V and a recommended current of 20 mA, run from a 5 V supply. The series resistor needed is:
Why is a relay often used to switch a mains load from a low-voltage circuit?