Structural sheathing is applied to a shear wall to keep it from _____.
a. bowing
b. racking
c. tilting
d. collapsing
Answer: B
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When an oil sample analysis indicates elevated levels of silicon, which of the following should be inspected first?
A. oil pump B. main bearings C. turbocharger D. low pressure intake circuit for leaks
The ____ are used to change the vapor to a liquid and the liquid form back into a vapor, the refrigeration cycle.
A. condenser and compressor B. compressor and expansion device C. expansion device and evaporator D. condenser and evaporator
Solar ___________ is a measure of how much solar power is striking a specific location.
a. insolation b. irradiance c. power d. sunlight
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.