What is typically used to house source circuit OCPDs in a roof-mount PV array and where is it located?
What will be an ideal response?
Typically, roof mounted arrays have the PV source circuit OCPDs located in a combiner box that is located on the roof with the array.
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What is the length of the line?
A line dimensioned at 6?11?? is shown on a drawing with a 1?4 scale.
A 150 V, dc. separately excited motor is used to lift material. The motor has an armature resistance of 1 ?, and K? = 3 Vs. The load torque is 9 Nm. The armature voltage of the motor is controlled by a single-phase, full-wave, ac/dc solid-state converter employing SCRs. The voltage on the ac side of the converter is 120 V (rms). The triggering angle of the SCRs is 30o when the motor is lifting up the load. Calculate the motor speed. Also calculate the triggering angle required to lower the same load at the same speed.
What will be an ideal response?
The temperature of the ground stays nearly constant at any depth below:
A) 4 feet. B) 28 feet. C) 6 feet. D) The frost line.
Technician A says that aluminum on the thread of a bolt indicates that the threads in the case are damaged. Technician B says that all bolts should be checked for damage before they are reused. Who is correct?
A. A only B. B only C. Both A and B D. Neither A nor B