Automation System – Section 1

21. Semiconductor devices:

A. are less reliable than electro¬mechanical components
B. usually have a very short MTBF (mean time between failure)
C. have a very short infant mortality period
D. All of the above
E. None of the above

Correct Answer: C. have a very short infant mortality period

22. A drum timer is a good example of:

A. an output actuator
B. an input sensor
C. a position sensor
D. a sequence controller
E. None of the above

Correct Answer: D. a sequence controller

23. The formula for memory capacity is:

A. MC = N/2
B. MC = 2/N
C. MC = N squared.
D. MC -2 to the Nth power
E. None of the above

Correct Answer: D. MC -2 to the Nth power

24. How is the integral mode implemented using analog methods?

A. Op amp and resistors
B. Op amp and a capacitor
C. Op amp and an RC network to place the error voltage across the capacitor
D. All of the above
E. None of the above

Correct Answer: B. Op amp and a capacitor

25. The general type of process found in industry is:

A. discrete parts
B. continuous
C. batch
D. All of the above
E. None of the above

Correct Answer: D. All of the above

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