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A DC motor, fed trough a four-quadrant chopper, works as a motor in thethird quadrant (reverse motion). The main data are Vo =120V, Ra = 0.5-ohm, La = 2.5mH, rated currentIan = 20A; rated speed nn = 3000rpm; separate excitation.Calculatethe rated e.m.f, eg , and rated electromagnetic torque,Te.For n =-1200 rpm and rated average current (iav =-Ian) determine the average voltage Vav,tc/T = αon and maximum and minimum motor current Imax and Imin for 1kHz switching frequency.
The unused states have to be taken care of in such a way that Even numbered unused states will go to state 7 and Odd numbered states will go to state 3. The combinational logic portion of the circuit should use NAND and NOT gates only.
the z-axis carries a 10mA current in the +z direction. A second line of current parallel to the first is located at x= 0, y=3cm carrying a 10 mA current in the -z direction. A rod exists in the y-z-plave from y= 1cm to y= 2 cm. velocity u = 2m/s z..
A Y-connected load with an impedance of 12-j15 Ohms per phase is connected to a balanced Delta-connected 208V, 60Hz, three-phase, positive phase-sequence supply. Determine 1) the line and phase voltage, 2) the line and phase current
A BJT is being used as a switch and is triggered whenever thebase-emitter voltage v(t) rises above 0.15 volts. The voltage v(t)is sinusoidal and changes according to v(t )= 0.23cos( 100π t)+ 0.16sin(100π t + 0.4) . a) Express v(t) a sine function ..
A device for heating a cup of water in a car connects to the car's battery, which has an emf EMF = 10.0 V and an internal resistance r_int = 0.08 \Omega. The heating element that is immersed in the cup of water is a resistive coil with resistance ..
Assume that theelectron velocity is zero at the cathode, the E-field is directedfrom the anode to the cathode with a magnitude of E =24/0.4[kV/m], and there is no magnetic field.
What approximate minimum BER is required for voice signals, data signals and what is the approximate BER level for the optical fiber systems ?
One system has a cpu a tdp of 125w and one has a 67w tdp. 125W System has 10 times bigger copper heatsink and blows 3 times more volume of air than the system of 67w. The 125w system reads 55C max CPU core temperature.
find the fourier series coefficients of z(t) (use the results of a) and b) along with the multiplication property of continuous time fourier series coefficients). find the fourier series coefficients of z(t) through direct expansion of z(t) in tri..
For what range of values of a is the system stable?
All of us know that an automatic iron box set at "silk" will get heated upto a particular value, and if it is set at "wool"' iron box will get heated upto a higher value. Draw a block diagram representing the control system.
In a ternary number system there arethree digits : 0, 1, and 2. The figure shown below defines aternary half-adder. Design a circuit that implements thishalf-adder using binary-encoded signals, such that two bits areused for each ternary digit.
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