Compared to reciprocating compressors, centrifugal compressors
A) Can move a larger volume of refrigerant B) Can operate at higher compression ratios
C) Can work effectively on smaller systems D) Can operate against higher head pressures
A
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_________ backflow is a reversal of normal flow in a system because downstream pressure is greater than the supply pressure.
a. Back-pressure b. Gravity c. Back-siphonage d. Suction
Which of the following are often used in conjunction with time clocks to turn off lighting when it is no longer needed?
a. Sound sensors b. Occupancy sensors c. Photosensors d. Ultrasonic sensors
A series circuit has three resistances: 12, 3, and 6 ohms. Circuit voltage is 14.3 volts. What is the total current flow in this circuit?
Fill in the blank(s) with the appropriate word(s).
In parallel line development, how is the pattern developed if the object is cylindrical and it is cut by a plane at an angle?
What will be an ideal response?