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1. A 240 dc motor takes an armature current of 20A when running at 960 r/min. The armature resistance is 0.2ohm. Determine the no load speed, assuming negligible losses.
2. A 220 dc shunt motor has a srmature resistance of 0.3ohm. Calculate
a) resistance required in series with the armature to limit the armature current to 80A at starting
b) the value of counter EMF when the armature current has decreased to 30A with the resistor still in the circuit.
Consider the LTI described by the following input-output relation: y[n] = 3/4y[n-1]-1/8y[n-2]+x[n] a)Find system function H(z) and check is system is stable. b)Determine impluse response h[n] of system
What is the minimum sampling rate that can be used to obtain samples that completely specify the following signalx(t) = 10cos(20*pi*t) - 5cos(100*pi*t) + 20cos(400*pi*t)
Design and implement an algorithm that determines whether or not a given array of elements, list1, is completely contained within another given array of elements, list2. Consider two different scenarios: 1) both arrays are sorted; 2) both arrays a..
An ideal reheat Rankine cycle operates between the pressure limits of 10 kPa and 8 MPa, with reheat occurring at 4 MPa. The temperature of steam at the inlets of both turbines is 500°C, and the enthalpy of steam is 3185 kJ/kg at the exit
Assume that the channels between the transmit antenna and the receive antennas are statistically independent Rayleigh fading channels and the MRC combination is used at the receiver. Given that the system BER is 10^-2 when the mean SNR is 3dB.
Find the input torque to the generator.If armature current and field current are kept constant, find the new value of the terminal voltage if the power factor is changed to 0.7 lagging.
A desktop computer uses 60-250 W of power when active and 1-6 W of power when hibernating, depending on the model. An LCD monitor uses about 20-30 W of power, depending on the screen size.
If a constant voltage drop of 16 V is maintained across an inductance of 140 mH that was initially carrying 1.6 A of current, how much time elapses before the inductor's stored energy reaches 590 mJ?
A) What is the rms current in the circuit B) The primary side of the transformer has 20 times as many turns as the secondary side. What is the rms voltage across the primary side of the transformers
In the plane z=5 there is a ring with a 3cm radius with its center on the z axis. The ring has a uniformly distributed charge Q. The origin 0,0,0 is at a small sphere with a mass of 0.5kg and a charge of -Q.
Design a static CMOS inverter with long channel transistors and a. switching voltage VM of 0.6 VDD. What is the resulting ratio of WP/WN b. switching voltage VM of 0.45 VDD. What is the resulting ratio of WP/WN
A turnstile antenna consists of two crossed dipole antennas. in this case, located in the x-y plane - the dipoles are also identical and lie on the x and y axes respectively and are both fed at the origin assume the equal currents are supplied
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