Automation System
The refresh-vector CRT uses which of the following techniques?

The beam constantly travels across the screen to turn on/off a series of pixels.
Makes changes on the image by increasing the anode voltage.
Creates images on the screen by scanning straight-line vectors between selected points.
None of these
Uses an electron gun to continuously flood the surface of the tube.

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Automation System
An aneroid barometer

is very unreliable
None of these
can be used to measure gas or liquid flow rates
measures pressure by sensing deflection of an evacuated chambers.
can measure only atmospheric pressure

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Automation System
A venturi tube:

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

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Automation System
Time proportioning control:

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

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