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Suppose that a shunt-connected machine operates at 800 rpm on the linear portion of its magnetization characteristic. The motor drives a load that requires constant torque. Assume that RA = 0. The resistances in the field circuit are RF = 50Ω and Radj = 25Ω. Find a new value for Radj so that the speed becomes 1200 rpm. What is the slowest speed that can be achieved by varying Radj?
A long, thin, nonconducting plastic rod is bent into a circular loop that has a radius a. Between the ends of the rod a short gap of length l, where l
You need to design a 1 to 8 demux with 4 bit inputs and output. design the architecture in gate level
when the load is removed from the generatorthe magnitude of the terminal voltage is 34500V. the generator feeds a delta-connected load through a transmission line with an impedence of 0.8+j6.4. the per-phase impedence of the load is2877-j864.
A computerrepresents information in groups of 32 bits. How many different integers can be represented in (a) binary, (b) BCD, and (c) 8-bit ASCII, all using 32bits
a three-phase,four pole,480 V,60 Hz,Y-connection slip-ring induction motor has the following parameters: R1=R'2=0.5 ohm ; X1+X'2=5 ohm. compute the starting torque and inserted rotor resistance that increases the starting torque by factor of 4.
A large brass washer has a 2 cm inside diameter, a 5 cm outside diameter, and is 0.5 cm thick. Its conductivity is s=1.5 X 107 S/m. The washer is cut in half along a diameter, and a voltage is applied between the two rectangular faces of one part.
Draw a block diagram of cellular radio network and draw a timing diagram illustrating how a call to a mobile user is initiated by a landline subscriber.
If L=0.0053nH, C=15µF find the operating frequency of series LC circuit. What factors decides capacitance? Explain using diagram.
1.xyz corporation is a manufacturer of widgets. over the past several months it has been selling its widgets for 100
The maximum radius a falling liquid drop can have without breaking apart is given by the equation: R = sqrt((sigma/gp)) where sigma is the liquid surface tension, g is the acceleration due to gravity, and p is the density of the liquid.
Calculate the current in the output of the source before and after the installation of the new device and The temperature sensor output is a voltage which is equal to the temperature sensed by the sensor. Design an electric circuit which can get th..
An opera glass uses an objective and eyepiece with focal lengths of +12 cm and -4.0, respectively. Determine the length (lens separation) of the instrument and its magnifying power for a viewer whose eyes are focused (a) for infinity and (b) for a..
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