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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.
i) Calculate the eigenvalues of a 100 hp, 1150 rpm dc machine at rated flux with no extra load inertia. Use the "hot" value of the armature resistance. Calculate estimates of t
Write a control word for counter 1 of 8253 / 8254 that selects the following options: load least significant byte only, mode 5 of operation and binary counting. Then write an ins
When three resistors R1, R2 and R3 are connected in parallel as shown in the diagram. For these resistors the equivalent resistance is given by: a. Derive a rule to
Cross-subsidy: The policy gives clarity on determination of cross-subsidy and additional surcharges for open access to consumers and lays down a timeframe for rationalization
With a block diagram explain fiber optic communication system Ans: The block diagram of a fiber optic communication system is display below: The input signal is giv
A 3-phase, 16-pole synchronous machine is driven by a prime mover at a speed of 600-rpm with the stator open circuited. The rotor flux per pole is 0.025-Wb. Determine (a) the fr
What do you understand by DB assembler directive? DB (Define Byte): The DB directive explains by a byte-type variable (that is a variable that occupies one byte of memo
Binary Number Systems As mentioned earlier this number is used by digital systems like microprocessor and other digital circuits. This number systems use only two
Semiconductor Material: Semiconductor is a material that has a conductivity level somewhere between the extreme of an insulator and a conductor Resistivity of a material
Design two converters - boost-buck (Cuk) and flyback meeting the following criteria: Vin = 15 V ... 35 V Vout = 25 V Output voltage ripple 1% peak to peak Switching frequen
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