Automation System
A venturi tube:

can be used to measure gas or liquid flow rates
measures the presence of a liquid
is made only of metal
None of these
is extremely difficult to use

ANSWER DOWNLOAD EXAMIANS APP

Automation System
Time proportioning control:

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

ANSWER DOWNLOAD EXAMIANS APP