The current through the anode-cathode circuit of an SCR must drop below the ____ level before the device will turn off.
a. charging current
b. falloff current
c. saturation current
d. holding current
d. holding current
You might also like to view...
OSHA requires fall protection for personnel working at elevations of _____.
a. 6 feet or more b. 9 feet of more c. 12 feet or more d. 15 feet or more
Use a spreadsheet and a study period of 8 years to select alternative A or B in Problem 5.20.
Problem 5.20
Compare two alternatives, A and B, on the basis of a present worth evaluation using i = 10% per year and a study period of 8 years.
 FIGURE 1.png)
Which of the following metering devices responds to changes in the superheat of the refrigerant vapor leaving the evaporator?
a. Low-side float valve b. High-side float valve c. Automatic expansion valve d. Thermostatic expansion valve
How is placement of the evaporator line determined when drawing a PH diagram of an operating system?
A) The evaporator line is always drawn on the horizontal line representing 50 psia absolute pressure. B) Draw a horizontal line across the saturation curve on the constant pressure line equal to the system low side absolute pressure. C) The evaporator line can be drawn anywhere that crosses the saturation curve as long as it is a horizontal line. D) Draw a vertical line across the saturation curve on a constant enthalpy line equal to the system low side absolute temperature.