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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.
There are two practical ways of improving commutation i.e. of making current reversal in the short - circuited coil as sparkless as possible. These methods are known as (i) resista
Q. Draw and explain a monostable multivibrator ? The monostable configuration consists of two amplifier stages interconnected in such a manner as to possess one stable state. T
Various compensation techniques
3 Phase 4 Wire Meters 3-phase 4 wire meters (10/20, 20/50 A) are used for agricultural and industrial consumers. For loads up to 50 A, the meters are directly linked to the su
Q. Describe about Boltzmann constant? The constant η in Figure (b) stands for the noise power spectral density, expressed in terms of power per unit frequency (W/Hz). Statistic
emf equation
UJT as a relaxation oscillator The UJT is a highly efficient switch it is used as trigger a device for SCR. No sinusoidal oscillators saw tooth generators phase contro
1. Write a MATLAB program to generate and plot the signal x1(n) = [3 2 -2 0 7], n = 0,1,2,3,4.
Q. Explain a common emitter configuration without a feedback. A simple common emitter transistor amplifier--having no negative feedback--is not an ideal amplifier. This is beca
define the physical significance of damping coefficient
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