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A shunt motor has the following ratings: 75 kW, 240 V, 1750 rpm, 300 A. The motor is supplied with 240 V source (constant) at its armature terminals. Its armature resistance is 0.0144 [O]. At rated current Ia = 300 A, the motor runs at rated speed of 1750 rpm.
(a) Compute the output power Pout, torque T, and speed sm of the motor at armature current of Ia = 0 [A].
(b) Repeat the solution for armature current Ia = 150 [A].Units: Find the speed sm in [rad/s], the ouput power Pout in [kW], and the torque T in [N m].Conversion factors: 1 rpm = 1 rev/min. 1 rev = 2p rad. 60 s = 1 min.
What functions must the communications stations perform? Repeat for ring and star.
A closed-loop system has a hold circuit and process as shown below. Determine G(z) when T = 1 and Gp(s) = 2 / (s + 2). A sampled-data system such as that presented in the above problem has a sampling period T = 0.05s
A pulse width modulation (PWM) circuit works by varying the duty cycle of the square wave while keeping the period fixed.
Find the complex impedance of the inductance. Find the phasor voltage and current, and construct a phasor diagram. Write the current as a function of time. Sketch the voltage and current to scale versus time. State the phase relationship between t..
Consider a network with a driving-impedance Z. (1) Find expression for P and Q. (2) Find p(t) in terms of P and Q. (3) Suppose that the network is a series RLC. Interpret the result in part (2).
a. Determine the current I(t) required to produce the B-field 2cos(wt)(T) in terms of other variables, for a sinusoidal field of 60 Hz, and N=100 turns. b. Now assume that you have the above B-field generated inside the solenoid.
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..
Derive the state space equation of a DC motor with: 1)supply voltage and load torque as inputs and 2)armature current, angular speed as outputs.
A) each charge is qual to q. Find the points in space at which the field intensity is zero. B) two charges are qual to q the third to 2q. show that the electric field intensity is zero only at infinity.
If the application program creates a message of 150 bytes and each layer (including the fifth and the first) adds a header of 20 bytes to the data unit, what is the efficiency (the ratio of application layer bytes to the number of bytes transmitte..
Consider the Norton equivalent circuit with respect to terminals 'a' and 'b' for the circuit shown below. Suppose that Ro is given as 10 . The Norton equivalent current must be zero because there are no independent sources.
A series circuit has the following components. For each, calculate the voltage across it and the current through it. Component voltage Current 9 V source 9V 9.1 Kohm resistor 1 Kohm resistor 2.2 kohm resistor.
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