What is a VFD and what is it used for?

What will be an ideal response?


Variable frequency drive which is used for controlling the rotational speed of an electric motor by controlling the frequency of the electrical power supplied to it.

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Southerners feared the Tariff of 1828 because

A. it would hurt their growing manufacturing sector. B. this same use of the power of the federal government could be used to suppress slavery. C. it might hurt Andrew Jackson's political career. D. they were convinced that it would destroy the American woolen industry. E. it could damage the chances of the American System's success.

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Which of the following symbols is normally used to indicate a separate pilot light?

a. A diamond with a large R and small P b. A diamond with a large P and small L c. A diamond with a large S and small P d. A diamond with a large R

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In RC and RL integrators and differentiators, transient time is equal to the:

A) pulse width times five. B) time constant times five. C) time constant. D) pulse width.

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The marked measurement in the figure above indicates _____



A) 9-11/16 centimeters
B) 9-11/16 inches
C) 9-13/16 inches
D) 9-13/16 centimeters

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