What values must be nearly equal before alternators can be paralleled?
What will be an ideal response?
Alternators cannot be paralleled until their voltages, frequencies, and instantaneous polarities are nearly equal.
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________: a measure of the economic rent or returns above costs accruing to businesses participating in a market during the current period.
Fill in the blank(s) with the appropriate word(s).
An existing Rankine heat engine has been operating with an overall efficiency of 15% for some months. The efficiency today is only 13%. Which of the following process upsets is NOT a possible explanation for the decrease in efficiency?
A. Operators allowing the controls to drift B. Calculation mistakes when designing C. Fouling (hard water minerals) buildup on the boiler D. Loss of lubrication on the turbine bearings E. Pump impeller wear
Torque is a force that accomplishes work by:
A. A grinding action B. A twisting action C. An explosive force D. A pushing action
Active soil acidity is a measure of the H+ ion activity in the soil solution
Indicate whether the statement is true or false