Most modern PLCs can connect to building networks using _____
A) RS-422 B) serial protocols C) Ethernet D) RS-485
C
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Al ensamblar secciones de una pluma reticulada, los colgantes deben estar _____.
a. en frente de las secciones que se conectarán b. detrás de las secciones de la pluma que se conectarán c. en el suelo directamente debajo de la pluma d. acoplados al mástil hasta que se hayan conectado todas las secciones de la pluma
The compounds A and B form non-ideal solutions in the liquid phase. At 50 ?C, a mixture of A and B has an EXCESS molar enthalpy as given below:
The heat capacities of the liquids are modeled as constant. Both are equal to CP=50 J/mol-K.
In a steady-state, constant pressure process, 1000 mol/min of pure A at 25 ?C is mixed with 500 mol/min of pure B at 35 ?C. The mixture then enters a heat exchanger in which the mixture is heated to 50 ?C.
A. Determine the rate at which heat is added to the heat exchanger.
B. If we are using a reference state in which the molar enthalpy, ?H, of pure A and pure B are both 0 at a temperature of 25 ?C, then what is the partial molal enthalpy, ¯H, of compound A in the mixture that is leaving the heat exchanger?
Technician A says that you only have to pay for a test one time; if you fail you can take it again for free. Technician B says that a photo ID is needed to enter the test center. Which technician is correct?
A) Technician A B) Technician B C) Both technicians D) Neither technician
A hydraulic press is being used to separate a bearing from a shaft. What should be used to cover the bearing during the pressing operation?
A) A fender cover B) A paper towel C) A shop cloth D) A brake drum