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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
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
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
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
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