Sensors and actuators: ADC and DAC

Which phrase best describes the process applied to the OUTPUT of the processor before it reaches the actuator in a monitoring & control system?

• converted to digital (via an ADC)

• converted to analogue (via a DAC)

• converted to analogue (via an ADC)

• converted to digital (via a DAC)

Which of these components in a monitoring and control system would typically utilise DIGITAL signals? Tick all that apply

• the sensor

• the cpu

• the memory

• the actuator

• the secondary storage (if present)

Complete the missing word:

The sensor takes a reading and the signal is converted to _______ before being sent to the processor.

DAC stands for... d______ t_ a_______ c________

Which of these terms incorporates more than just a processor?

• CPU

• microprocessor

• microcontroller

A smoke alarm is an example of a

• monitoring system

• control system

• monitoring and control system

The temperature of your room is an example of

• analogue data

• digital data

Which of these are good reasons why computers only process digital data (select two)

• Computers use switches (transistors) which are either on or off.

• Computers can only count zero and one

• Computers are designed to only recognise two states of voltage... low (0v) and high (approx 5v).

• Because our number system is base 10 and this number uses a 1 and a 0

Inputs to a monitoring and control system, prior to processing, can come from

• sensors

• actuators

• both sensors and actuators

A digitally controlled door lock would be most likely to use which actuator?

• a dc motor

• a servo

• a solenoid