A Hall effect switch is usually used to:

A. measure voltage

B. measure temperature

C. sense a vacuum

D. sense the presence of a magnetic object.

E. None of the above

Answer: Option D

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Related Questions on Automation System

A program language:

A. defines the form of the instruction

B. is always machine dependent

C. is never machine dependent

D. All of the above

E. None of the above

Computer-based controllers:

A. should be built in a modular fashion wherever possible

B. are very difficult to change

C. are very flexible

D. (a) and (c) above

E. None of the above