What are some requirements for a two-pump motor circuit?
What will be an ideal response?
The requirements for a two-pump motor circuit include:
1. The pump motors are operated by a 480 volt three-phase system, but the control circuit must operate on a 120-volt supply.
2. Each pump motor contains a separate overload protector. If one pump overloads, it must not prevent operation of the second pump.
3. A manual ON-OFF switch can be used to control power to the circuit.
4. A pressure switch mounted on the tank controls the operation of the pump motors. When the pressure of the tank drops to a certain level, one of the pumps will be started. When the tank has been filled with water, the pressure switch will turn the pump off. When the pressure of the tank drops low enough again, the other pump will be started and run until the pressure switch is satisfied. Each time the pressure drops to a low enough level, the alternate pump motor will be used.
5. An override switch can be used to select the operation of a particular pump, or to permit the circuit to operate automatically.
You might also like to view...
In the event that a definite indicator is recognized, the corresponding ____ must be activated immediately.
A. alarm B. IR plan C. rootkit D. IDPS
In order to make CDs look more attractive as an investment than they really are, some banks advertise that their rates are higher than their competitors’ rates; however, the fine print says that the rate is based on simple interest. If you were to deposit $10,000 at 10% per year simple interest in a CD, what compound interest rate would yield the same amount of money in 3 years? Solve by formula and write the spreadsheet function to display the i value.
What will be an ideal response?
____ materials are synthetic compounds that are sprayed onto a surface and that then produce an insulating foam by a chemical reaction.
A. Foamed-unset B. Foamed-in-place C. Poly-foamed D. Refoamed
A small chip between the collars on a mill arbor will:
A) Make the arbor harder to drive B) Both C and D C) Damage the cutter hub and collar faces D) Cause cutter axial runout