Para ser efectivo, un sistema de conexión a tierra debe limitar el voltaje en el sistema eléctrico y protegerlo de todos los casos siguientes EXCEPTO:
a. exposición a rayos.
b. sobretensión superior a aquélla para la que se ha diseñado el circuito.
c. incremento en el potencial MÁXIMO a tierra debido a voltajes anormales.
d. condiciones de infratensión
d. condiciones de infratensión
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Which type of circuit is uncommon in HVACR work?
a. Series circuit b. Resistive circuit c. Parallel circuit d. Transformer-powered circuit
Inspectors must monitor the quality of milk and dairy products to ensure that the products are:
a. affordable and correctly packaged c. safe and wholesome b. delivered in a timely manner d. nutrient rich and on schedule
Why is nitrate an issue for human health and the environment?
What will be an ideal response?
The Reynolds number is reduced if __________.
A. the diameter of the pipe is smaller B. the viscosity of the fluid is larger C. the velocity of the fluid reduces D. a fluid with a lower density is used E. all of the above