Automation System
A Hall effect switch is usually used to:

measure temperature
measure voltage
sense the presence of a magnetic object.
sense a vacuum
None of these

ANSWER DOWNLOAD EXAMIANS APP

Automation System
Time proportioning control:

cannot use a TM990 micro¬computer
is less efficient than normal PID control
a and b above.
can be used on a PM550 programmable process controller
None of these

ANSWER DOWNLOAD EXAMIANS APP