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A 50-hp, 230-volt shunt motor has a field resistance of 17.7 Ω and operates at full load when the line current is 181 A at 1,350 rev/min. To increase the speed of the motor to 1,600 rev/min, a resistance of 5.3 Ω is "cut in" via the field rheostat; the line current then increases to 190 A. Calculate:
a. The power loss in the field and its percentage of the total power input for the 1,350 rev/min speed.
b. The power losses in the field and the field rheostat for the 1,600 rev/min speed.
c. The percent losses in the field and in the field rheostat at 1,600 rev/min.
A 10 MHz crystal has a negative temperature coefficient of 4.1Hz/MHz/Co. Determine the crystal frequency if the temperature decreases by 41 degrees.
a tank is initially filled with 1000 litres of brine containing 0.15kg of salt per litre. fresh brine containing
explian why a single phase IM is not self starting.descibe two ways that can make a single phase IM self starting compare tha air gap mag filed produced bt 1 phase IM and 3 pahse IM
Show how you would build a 128 X 8 RAM memory using 32 X 4 RAM chips. Give a play-by-play account of how -36 (decimal) would be stored in location 80. (using block diagrams for the 32 X 4s, but showing all other details)
For the function G(x) = x + 32 / x^2 A) Determine the relative minimum of G B) Describe the concavity for all values of x except zero
Consider a classical model of a hydrogen atom, with nucleus of charge -e orbited by an electron of charge +e, where e = -1.6×10-19 C. If these may be modeled as point charges separated by 0.053 nm, determine the electrostatic force acting on the e..
If the resultant core flux is 0.0683 Wb (max), determine (a) the number of turns of wire in the secondary coil; (b) the new core flux if the driving voltage is increased by 20 percent and the frequency is decreased by 5 percent.
When the bit rate of a message signal from the message sequence generator and the bit rate of a PN code from the multiple sequence generators are compared, which is higher
Derive the relation between the liquid and gas concentration at any level in the tower, as at point P.- and prove the equation below;
A FM radio station transmits signals with circular polarization at 100 MHz center frequency. A vertical quaterwave monopole antenna is used in a radio set to receive this signal. If the average power density of the signal is 0.265pW/cm^2
Suppose the field to be imaged contains 3 parallel bars of width W mm, spread nonuniformly, with the darkness profile. Determine the darkness profile of the bars after imaging. Can you still tell all the bars apart
F = B'D' + A'B'C + ABC + CD' Draw a circuit for this function using only AND , OR, and NOT gates. The function calls for two 3-input AND gates and one 4-input OR gate. All you have available, however, are 2-input AND and OR gates
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