Select the correct input logic contact for the following situation. Field device is NC, the rung output should be off or not active when the field device is not activated
A) Examine on B) Examine off C) Insufficient information
B
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Answer the following statement(s) true (T) or false (F)
1. Even though the electromechanical relay has served well for many generations, the ever-increasing sophistication and complexity of modern processing equipment requires faster acting, more reliable control functions than electromechanical relays and/or timing devices can offer. 2. PLCs are designed to be operated by plant engineers and maintenance personnel with limited knowledge of computers. 3. A typical PLC can be divided into three components consisting of the processor unit, the power supply, and the programming device. 4. The number of input and output modules necessary is dictated by the requirements of the equipment that is to be controlled by a PLC. 5. Analog I/O devices are either ON or OFF, open or closed.
A moist soil has a moisture content of 12.5 percent, weighs 43.2 lb, and occupies a volume of 0.35 ft3. The specific gravity of the soil particles is 2.6. Find: (a) bulk density, (b) dry density, (c) void ratio, (d) porosity, (e) degree of saturation, and (f) volume occupied by water (ft3).
What will be an ideal response?
This symbol in a wiring diagram indicates ________
A) A fuse B) A female terminal C) A male terminal D) A splice
How long will it take a 0.047 ?F capacitor to completely discharge through a 10 k? resistor?
A) 0.47 ms B) 2.35 ms C) 0.18 ms D) 5 s