How are control devices wired in most HVACR circuits?
A) Controls may be wired either series or parallel to the load, depending upon the type of control that is needed
B) Controls are typically wired in parallel with the power supply so that they receive full voltage for proper operation
C) Controls are typically wired in series with the load they control
D) Controls are typically wired in parallel to the load they control
C
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A(n) ____________________ is a value that shows the number of equal parts taken of a whole quantity or unit.
Fill in the blank(s) with the appropriate word(s).
An open winding in an electric motor means that ____.
A. the winding is making contact with the motor frame B. one winding is making contact with another winding C. a wire in a winding is broken D. the centrifugal switch to the start winding is open
What controls the firing of a water boiler?
A) The auxiliary switch on the zone valve B) The boiler water temperature is normally maintained by the high limit and the low water cutout C) An aquastat that senses the temperature of the water in the boiler D) A wall thermostat that senses the temperature of the house
A continuous-time signal x (t) = 10 sinc (25t) is sampled at
