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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.
As far as a direct compaison of mechanical switches vs. transistors used as switches, the transistor does have a measurable impedance when ON, and a mechanical switch does not.
Where f is a constant called the rolling resistance coefficient and W is the vehi- cle weight. For a vehicle weighing, W = 300 kN that is traveling at 100 km/h, calculate the power in kW required to overcome the vehicle rolling resistance for f ..
If Nand gates are used throughoutand a ripple-carry design is used, calculate the delay through the adder, assuming all inputs are presented at the same instant, and counting D seconds per gate. Which output signal suers the worst delay.
Suppose that we want to determine how many of the bits in a six-bit unsigned number are equal to 1. Design the simplest circuit that can accomplish this task.
The voltage V across a semi conductor in a computer is given by V= aI+BI^2, where I is the current (in A). If a 24 V battery is conducted across the semi conductor, find the current if a=4 ohms and B= 0.5 ohms/A.
An M-bit thermometer code for the number k consists of k 1s in theleast significant bit positions and M-k 0s in the more significant bit positions. A binary-to-thermometer code converter has N inputs and 2N-1 outputs.
Whatever degree is the announcement "The threat of the Cuban Miissile Crisis has been not kidding misrepresented" genuine?
Derive a rule to estimate the network resistance when one of the resistors has a much smaller resistance than the other two and derive a rule to estimate the network resistance when two of the resistors have much smaller values.
Consider the analog filter H(s)=30000/(s^2+400s+30000) , notice that the filter gain in the passband is unity or 0 dB. You can also use MATLAB command "roots" to check for the poles that are p_1=-100 rad/s, and p_2=-300 rad/s.
What are the tolerances associated with a standard lightning impulse waveform and, a standard switching impulse waveform and define Marx's principle and explain how it is used in the operation of a multi stage impulse generator.
when the remaining sources of e.m.f. are replaced by conductors, the resistances of which are equal to the internal resistances of the respective sources.
Express the sequence x(n)={1 n=0 , 2 n=1 , 3 n=2 , 0 else} 1- Express the signal as a sum of weighted and shifted unit impulse sequence. 2- Express the signal as a sum of weighted and shifted unit step sequence
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