Profibus-PA is a bus that ________
A) Is used for communication between distribution systems and PLCs
B) Is used for process-level instrumentation
C) Supports both analog and discrete signals
D) Supplies automation controls
B
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When you are asked to repair weld an aluminum diesel fuel tank, which of the following is recommended?
A. fill with fuel before welding B. fill with water before welding C. steam and fill with nitrogen D. steam and fill with oxygen
____ is the elapsed time between the instant a deviation of the controlled variable occurs, and the corrective action begins.
A. Time lag B. Dynamic response C. Dead time D. Pure lag
Solutions with a high conductivity require a sensor with a cell constant __________ than 1.
A. less B. greater
In an open delta with a center-tapped transformer, label the two ends of the center-tapped transformer as L2 and L3 and label the high leg as L1. The current flow in the neutral (center tap) is equal to _____.
A. AN = A1- (A2 + A3) B. AN = A1 + (A2- A3) C. AN = A1- (A2- A3) D. AN = A1 + (A2 + A3)