What is an oil lift?
A) An oil lift helps return oil up a vertical riser using an integral orifice tube, which creates a Bernoulli effect, forcing oil up the line.
B) An oil lift is an electric oil pump that moves collected refrigerant oil up against gravity.
C) An oil lift is a trap at the bottom of a vertical suction riser.
D) An oil lift is the increase in pressure created in the suction line due to the presence of refrigerant oil.
C
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You need to prepare to perform a First Law analysis on a device. The device contains 2 inlets and one outlet. The device is very large, with the two inlets located ~30 m above the outlet. There is a mechanical shaft entering the system, which the operator informs you is to aid in the mixing of the two fluids. The operators informs you that the flow rates used in this system are low, despite the large size of the system. The operator informs you that the device operates in a steady manner. Beginning with the general equation for the First Law of Thermodynamics, develop a simplified expression that should be suitable for use with this device.
What will be an ideal response?
The country that generates the most electrical power from wind energy is _____
a. the United States b. China c. Canada d. Norway
How does a building end up with a positive or negative e pressure?
What will be an ideal response?
When the emitter-base junction is reverse biased, the transistor is operating
A) at saturation B) in its active region C) at cutoff D) as a voltage-controlled device