Which of the following factors determine the synchronous speed of an AC motor?

A. inductance of the rotor windings
B. the frequency of the applied voltage
C. the number of field poles per phase
D. the physical load driven by the motor
E. both b and c


Answer: E

Trades & Technology

You might also like to view...

Which of the following would ensure that the breathing efficiency of a pair of intake valves on one diesel engine cylinder was identical?

A. air to air cooler B. crossflow valve configuration C. tuned intake manifold D. parallel port valve configuration

Trades & Technology

The ____ of the knurl gives the number of teeth per linear inch.

A. rise B. pitch C. run D. depth

Trades & Technology

Gypsum is the most widely used chemical for the reclamation of sodic soils. What characteristic likely accounts for this popularity?

A) Gypsum reacts with Na+ ions to form insoluble Na2SO4. B) Gypsum is abundant and low priced. C) Gypsum provides sulfates that attract Na+ from the exchange complex. D) Gypsum forms sulfuric acid that helps reduce the soil pH. E) Gypsum is quite insoluble so it remains in the soil for long periods of time.

Trades & Technology

A perfect 30"Hg vacuum is, in reality, unobtainable. So when reference is made to a 30"Hg vacuum, we are actually referring to a vacuum of __________.

A. 25.4"Hg B. 28.9"Hg C. 29.29"Hg D. 29.92"Hg

Trades & Technology