Why is 24 volts used for the control circuits in residential and light commercial heating and air-conditioning systems?
What will be an ideal response?
Safety and lighter duty controls are more accurate and installation cost is less.
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Pioneers in the development of early commercial synthetic plastics struggled with ____. ?
A. ?temperature control in making plastics B. ?finding raw material C. ?the purity of the chemicals in making plastics D. ?understanding chemical reactions
Nancy applied 48-52-45 units of fertilizer per acre to 220 acres in pasture. She used 46-0-0 urea at $499 per ton, 18-46-0 DAP at $704 per ton, and 0-0-60 muriate of potash at $567 per ton. What was the cost of the fertilizer?
What will be an ideal response?
wound rotor motor has been recently put back into service but is now rotating in the wrong direction. After examining the motor, you find that lead L1 is connected to T2, L2 to T3, and L3 to T1. To correct the rotation, you should
a. Connect L2 to T1, L3 to T2, and L1 to T3. b. Connect L1 to T1, L2 to T3, and L3 to T2. c. Connect L1 to T1, L2 to T2, and L3 to T3. d. Reverse phase connections between the wound rotor and the resistor bank.
Explain the primary purpose of the receiver.
What will be an ideal response?