The advantage of the backward-curved centrifugal fan over the forward-curved centrifugal fan is that:
A) Backward-curved fans are normally quieter in operation.
B) Backward-curved fans operate at lower RPM.
C) Backward-curved centrifugal fans are well suited for small airflow quantities.
D) Backward-curved fans are non-overloading.
D
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A. smallest B. farthest from the viewer C. closest to the viewer D. largest
Reactive power is always _____.
a. equal to true power b. 90° out of phase with true power c. measured in ohms d. responsible for performing most of the work in a circuit
Which of the following protect the motor and control devices against overheating?
a. Solid-state overload relays b. Solid-state relays c. Timing relays d. Thyristors
La finalidad principal de los dinamómetros es:
a. trazar los conductores. b. monitorizar la tensión del halado. c. monitorizar la longitud de los tramos de cable. d. verificar el aislamiento del cable.