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A thin electrical heater is inserted between a long circular rod and a concentric tube with inner and outer radii of 20 and 40 mm. The rod (A) has a thermal conductivity of k A = 0.15 W/m. K, while the tube (B) has a thermal conductivity of k B = 1.5 W/m. K and its outer surface is subjected to convection with a fluid of temperature T8 = -15°C and heat transfer coefficient 50 W/m2 · K. The thermal contact resistance between the cylinder surfaces and the heater is negligible.
(a) Determine the electrical power per unit length of the cylinders (W/m) that is required to maintain the outer surface of cylinder B at 5°C.
(b) What is the temperature at the center of cylinder A?
Calculating a DC Current through the telephone handset, A telephone handset has a resistance of 600 ohm. It is connected to the local telephone exchange at a distance of 5 km by a twisted pair that has a loop resistance of 200 ohm per km
Let the filter length be 7 or 8. Design four different filters: Type I, Type II, Type III, and Type IV. Derive the equations for the ideal impulse response for these filters. Then multiply the ideal impulse response by the appropriate window funct..
What is Corona effect on transmission Line?And states some sources of Corona loss.
The state machine has two inputsignals, LEFT and RIGHT, that carry the driver's request fora left turn or a right turn. It also has anemergency flasher input, HAZ, that requires the tail lights to beoperating in hazard mode - all six lights flashi..
Three single-phase two-winding transformers, each rated 25 MVA, 34.5/13.8 kV, are connected to form a three-phase bank. Balance positive-sequence voltages are applied the high voltage terminals, and a balanced, resistive Y load connected
A linear circuit has a capacitance of 1.0 mF and an inductor of 1.0 µH. If the frequency response of the voltage gain should stay the same and the capacitor is scaled to 70 µF, what should the value of the inductor be
An opamp based integrator is measured at 1KHz to have a voltage gain of -100 V/V. At what frequency is its gain reduced to -1V/V. And, what is the integrator time constant
A 415V 50 Hz three phase supply has been divided into three balanced loads, as follows: LOAD 1 (STAR): 15 kVA at a power factor of 0.60 lagging; LOAD 2 (DELTA): 24 kW at a power factor of 0.55 lagging;
Although this forms PNP and NPN transistors, the bias of the regions is designed so the junctions are reverse biased and the electric field effects on the channel are supposed to control the MOS-FET transistor soperations.
by using the laplace transform compute the convolution xtvt of the two signals where xte-tut and vtsin
Measurments taken of a square-wave signal using a frequency-selective voltmeter(called a spectrum analyzer) show its spectrum to contain adjacent components(spectral lines) at 98KHz and 126 KHz of amplitudes 63 mV and 49 mV
Design a series resonant circuit to have a bandwidth of 400 Hz using a coil with a Ql of 20 and a resistance of 2-ohm. Find the values of L and C and the cutoff frequencies
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