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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.
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Registers A resister is a group of flip flops or binary cells which holds the binary information. Since a binary cell stores one bit of information an n bit regis
write down the debroglie equation
Q. What is meant by armature reaction. Explain briefly the bad effects of armature reactions. Sol. By armature reaction is meant the effect of magnetic field set up
Direct Addressing In this addressing mode one of the operands is the data stored in the memory. The memory address of the operand is directly given in the instruction
Q. How does a MOSFET amplify electrical signals? While a minimum requirement for amplification of electrical signals is power gain, one finds that a device with both voltage an
Q. What do you mean by Frequency response? Now let us examine the response of a circuit to a sinusoidal source, called an oscillator, whose frequency can be varied.Known as the
A DT LTI system has the following impulse response: h(n)=[cos(pi/+delta(n)] u(n-3)u(n-2) (a) Find the system’s frequency response h(e^jw ). (b) Sketch the magnitude and phase respo
Q. Let v(t) = V max cos ωt be applied to (a) a pure resistor, (b) a pure capacitor (with zero initial capacitor voltage, and (c) a pure inductor (with zero initial inductor curren
Q. A four-pole, lap-wound armature has 144 slots with two coil sides per slot, each coil having two turns. If the flux per pole is 20 mWb and the armature rotates at 720 r/min, cal
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