La denominación "masas de agua artificiales" hace referencia a estanques de aireación, _____, estanques de contención para inundaciones, estanques para tratamiento de agua y canales de irrigación.
a. arroyos
b. lagos
c. estanques de granjas piscícolas
d. ríos
d. ríos
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Tanto los motores de inducción como los sincrónicos funcionan con el principio de un campo ______ giratorio.
a. de impedancia b. magnético c. de capacitancia d. de reactancia
A black box with a circuit in it is connected to a variable resistor. An ideal ammeter (with zero resistance) and an ideal voltmeter (with infinite resistance) are used to measure current and voltage as shown in Fig. 4.143. The results are shown in the table below.
 FIGURE 1.png)
What is the difference between a viscous impingement filter and a standard filter?
A) Viscous filters are treated with a sticky substance to trap and hold dirt. B) Viscous filters are tested for viscosity. C) Viscous filters are specifically for filtering oil. D) Viscous filters use an electrical charging system.
The best tool for defrosting an evaporator coil is a sharp knife.
Answer the following statement true (T) or false (F)