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A 3-phase, 440 V, 4-pole 50 Hz induction motor has a star-connected stator and rotor. The rotor resistance and standstill reactance/ phase are 0.22 Ω and 1.2 Ω respectively; the stator to rotor turn ratio being 1.3. The fullload slip is 4%. Calculate the full-load torque and power developed. Find also the maximum torque and the corresponding speed
A causal discrete LTI system is described by y(n)-3/4 y(n-1)+1/8 y(n-2)=x(n) where x(n) is the input and y(n) is the output Find the response of the system if x(n) =u(n)
A battery is charged. The relationship between the charging current, i amperes and the time, t hours passed, is given by the formula:
a) Using a table of the Gaussian distribution, determine an exact value for P[|X-n|>=2.5sigma] b) What is the upper bound on P[|X-n|>=2.5signma] given by the Chebyshev inequality
looking for a brief theory on touch voltage, step voltage and ground potential rise (GPR). Should include graphical representation and relevant equations to help in understanding.
A square-law modulator for generating an AM wave relies on the useof a nonlinear device. The given figure depicts the simplest form of such amodulator. Ignoring the higher order terms, the input-output characteristics of thediode-load resistor
When disconnected and fully charged, the voltage across the battery terminals is measured to be 13.8 V. When connected to a load that dissipates 18 W of power, the terminal voltage of the battery decreases to 12 V.
What is the major difference between a bipolar and a unipolar device Which of the transistor currents is always the largest Which is always the smallest? Which two currents are relatively close in magnitude
Three point charges are positioned in the x-y plane as follows: 5 nC at y = 5 cm, -10 nC at y = -5 cm, and 15 nC at x = -5 cm. Find the required x-y coordinates of a 20-nC fourth charge that will produce a zero electric field at the origin.
Determine the respective lengths l1 and l2 of the two inner and outer pieces of timber that will yield the same factor of safety as the original design.
What is the fractional change in total mass? (c) If one were to form 10 grams of water by this reaction, what would be the total change in mass?
Determine the impulse response y(n) if the input x(n) = δ(n);
IN a 2-pole, 208 V (line-to-line, rms), 60-Hz, motor, Rs= 0.5Ω and R'r = 0.45Ω, Xls= 0.6Ω, and X'tr = 0.83Ω. The magnetizing reactance Xm = 28.5Ω. This motor is supplied by its rated voltages. The rated torque is developed at teh slip s = 0.04.
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