A hardwired master control relay (MCR) is used with relay ladder logic to shut down all or a portion of the relay ladder logic by turning on the MCR with ________
A) Internal control logic B) Output relay logic
C) Input relay logic D) External control logic
C
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There are two types of datum feature simulators: ____________________ and physical.
What will be an ideal response?
Beams are primarily designed to resist ____ forces.
A. torsion B. tension C. bending D. shear
When water gets into a refrigeration system, chemical reactions inside the system often create:
A) Phosgene gas. B) Fluoride crystals. C) Acid. D) Combustible gas.
How is placement of the condenser line determined when drawing a PH diagram of an operating system?
A) The condenser line can be drawn anywhere that crosses the saturation curve as long as it is a horizontal line. B) Draw a vertical line across the saturation curve on a constant enthalpy line equal to the system high side absolute temperature. C) Draw a horizontal line across the saturation curve on the constant pressure line equal to the system high side absolute pressure. D) The condenser line is always drawn on the horizontal line representing 275 psia absolute pressure.