Para un número dado de polos, el/la _____ determina la velocidad de un motor de CA.
a. voltaje
b. corriente
c. frecuencia
d. tamaño de armazón
c. frecuencia
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____ is the removal of base and weld metal from the other side of a joint that has been groove welded.
A. Front gouging B. Back gouging C. Back filling D. Back notching
¿En qué tipo de aplicación industrial se utilizan los revestimientos laminados con plomo?
a. Control acústico b. Criogénica c. Sistemas subterráneos de tuberías d. Cortafuegos
Agriculture is not dying; it's changing
Indicate whether the statement is true or false
The major concern with ammonia refrigerant is:
A) It is much more expensive than halogenated refrigerants. B) Its normal operating pressures are extremely high. C) It is poisonous and flammable. D) It can only be used with copper, brass, and aluminum.