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1. Name the three parts of a programmable logic controller (PLC) and explain why the PLC is preferred by designers over electromechanical relays.
2. Medium-voltage circuit breakers operating on system voltages between 600 volts and 15 kilovolts generally contain blow-out coils and a puffer. Describe a puffer.What is its funtion?
3. How is an electrical distribution system protected from lightning strikes? Name and describe the device used and describe its electrical connection to the distribution system it protects.
4. The first step in preparing a primary distribution cable for connection to a transformer, tap box, or other terminal equipment is to remove the semiconducting jacket. The next step is to crimp a flat lug onto the cable connector. List in any order any three of the next six steps in making the connection.
When sizing wire, one of the most difficult tasks is to calculate the electrical load that will be present on the conductors. How do you decide what size wire to use? What two fact
Consider an RLC series circuit excited by v (t) = 100√2 cos 10t V, with R = 20 , L = 1 H, and C = 0.1 F. Use the phasor method to find the steady-state response current in the cir
Q. Describe about transmission-line voltage regulation? The transmission-line voltage regulation (TLVR) is the ratio of the per-phase voltage drop between the sending-end and r
Classify the magnetic materials into diamagnetic, paramagnetic, ferromagnetic and ferrimagnetic materials. Also give examples of each. Classification of magnetic materials:-
Q. A two-winding system has its inductances given by where k 1 and k 2 are constants. Neglecting the winding resistances, derive an expression for the electric force when
Q A wire with n = 10 30 electrons/m 3 has an area of cross section A = 1mm 2 and carries a current i = 50 mA. Compute the number of electrons that pass a given point in 1 s, and
Q. Electronic Photo Flash? A simplified schematic diagram of the electric circuit of an electronic photo flash typically used on cameras is shown in Figure 7.7.1. By passing a
Q. Consider an infinitely long, straight wire (in free space) situated along the z-axis and carrying current of I A in the positive z-direction. Obtain an expression for ¯B everywh
The city and guild electrical systems design task A and 2365-305 Do you have these two assignments to sell ?
NAND Gate NAND means NOT AND it complements the output of an AND gate. The symbol of NAND by a NOT gate. Generally Not operation is represented by a bubble as shown
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