If the pH of the solution varies widely, a(n) __________ controller is used to apply the acid or base.
A. on-off
B. proportional
Answer: B
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Main sewers are installed with ____________________ to define the alignment and slope.
Fill in the blank(s) with the appropriate word(s).
When drywall nail heads work up from under the finished surface after installation is complete, the job is said to have _____.
a. dimples b. nail pops c. nail bumps d. ripples
Which one of the following statements is not true for the PLC 5 and SLC 500 counters?
A) Counters store negative values in the in 2's complement format. B) The PRE is 16 bit integer memory register that stores the count value or set point for the number of counts to trigger an output. C) The ACC stores the count value by incrementing one count for every true to false change in the counter ladder rung. D) A reset instruction (RES) is used to return the ACC to zero.
The relationship for the impedance matching ratio (RL/Rpri) in a transformer is:
A) opposite to the turns ratio (Nsec/Npri) squared. B) opposite to the turns ratio (Nsec/Npri). C) equal to the turns ratio (Nsec/Npri). D) equal to the turns ratio (Nsec/Npri) squared.