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A Bakelite coating is to be used with a 10-mm-diameter conducting rod, whose surface is maintained at 200°C by passage of an electrical current. The rod is in a fluid at 25°C, and the convection coefficient is 140 W/m2 · K. What is the critical radius associated with the coating? What is the heat transfer rate per unit length for the bare rod and for the rod with a coating of Bakelite that corresponds to the critical radius? How much Bakelite should be added to reduce the heat transfer associated with the bare rod by 25%?
Design a 4-bit "adder/subtractor/comparator" circuit with inputsand outputs. it will have as inputs a control input SUB/ADD' amdtwo four-bit two's complement numbers, A4-A1 and B4-B1. It will have as outputs a four-bit two's complement number S4 -..
A 5-MVA, 66:13.2kV, three-phase transformer supplies a three-phase resistive load of 4,500kW at 13.2kV. What is the load resistance in ohms as measured from the line-to-neutral on the high-voltage side of the transformer, if it is connected in Y
Calculate the inductive reactance per meter of a single-phase, 50-Hz, two-wire transmission line. Assume each conductor's radius is 3cm and the distance between the two conductors is 2m .
A 15μF capacitor is connected to a 50 V battery andbecomes fully charged. The battery is removed and a slab ofdielectric that completely fills the space between the plates isinserted. If the dielectric has a dielectric constant of 5.0,
Design a series controller (a PD, PI or PID) so that the following performance specifications are satisfied. Steady-state error due to a step input = 0
An RLC series circuit has an inductance L = 0.02H, a resistance 40 ohms, and a capacitance of 5(10)^-5 farads, and a constant voltage E(t) = 40 volts. Find the current I(t) if I(0) = 0 and Q(0) = 0 and what is the maximum current
You are evaluating the feasibility of adding an injection molder to fabricate plastic sporks (everybody’s favorite harmless utensil) for the US Facility for the Criminally Insane. An injection molder will cost $1,200,000 installed.
For a given lithium ion battery, it can supply 0.85 ampere-hours, or 850 (mAh) with a constant output voltage of 3.6 (V). How much energy is stored in this lithium ion battery. How much energy is imparted to an electron that flows
Using a 3-V power supply, design a version of the circuit of fig 6.62 from the book. to provide a dc emitter current of 0.5 mA and to allow a +-1-V signal swing at the collector. The BJT has a nominal B=100. Use standard 5 % resistor values
150 kVA, 2400/240 V single-phase transformer has the parameters. (a) Determine the equivalent circuit referred to the high-voltage side. (b) Find the primary voltage and voltage regulation when transformer is operating
draw ray inside the core by using matlab draw 3 circles or four circles with different angles so every circle has
Four equal point charges Q form a square of side length a. Calculate the assembly energy for this configuration.
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