Which of the following is a benefit derived from using a pulsewidth-modulated (PWM) variable frequency
drive (VFD) versus an analog SCR VFD?
a. Controlled starting
b. Reduced problems with harmonics
c. Adjustable torque limiting
d. Adjustable operating speed
b
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A solenoid valve is a(n) ____ operated valve.
a. electrically b. manually c. mechanically d. digitally
The tricuspid valve is located
A) in the opening of the aorta. B) in the opening of the pulmonary trunk. C) where the vena cavae join the right atrium. D) between the right atrium and right ventricle. E) between the left atrium and left ventricle.
A variable displacement engine changes effective displacement by ________
A) Changing piston stroke B) Blocking the intake manifold C) Deactivating cylinders D) Changing manifold length
It is a good practice to connect the fan motor and compressor motor for an air conditioner in series so that when one quits the other will stop
Indicate whether the statement is true or false