Variable-frequency drives (VFD) reduce the speed of AC motors by:
A) Applying an adjustable magnetic brake to the motor.
B) Controlling the voltage available to the motor, like a light dimmer.
C) Limiting the current to the motor.
D) Controlling the frequency (Hz) of the power to the motor.
D
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______ is a piece of flat metal that will not rust or deteriorate that covers the point at which the chimney and roof meet.
A. Flashing B. Corbeling C. Capping D. Coping
What is heat energy that causes a change in state—solid to liquid or liquid to vapor?
a. kinetic energy b. latent heat c. latent heat of fusion d. sensible heat
Summarize why shielding gas is needed in GMAW welding.
What will be an ideal response?
The two standard projection methods for creating multiviews are first- and third-angle projection.
Answer the following statement true (T) or false (F)