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A synchronous motor is rated as 250 hp, 4.8 kV connected 60 Hz 12 poles with Xs=0.6 pu and Rs=0.01 pu. The motor rotational losses are 1.5 kW and the excitation power is 6 kW. The motor is supplied by rated voltage at the stator. The motor delivers 2.5 kNm of torque to the mechanical load and maintains a unity power factor at the stator. Calculate the internally generated voltage, the stator current, and the motor power efficiency.
A differential amplifier stage has collector resistors of 5.1 Kohms each. If Ic1 = 1.35 mA and Ic2 = 1.29 mA, what is the differential output voltage.
Consider a permanent-magnet dc-motor with the following parameters: Ra=0.35Ohms, La=1.5mH, Ke=0.5V/(rad/s), Kt=0.5Nm/A, and Jm=0.02kgm^2. The rated torque is 4Nm. This motor is supplies by a switch-mode dc-dc converter
The solution to Power Factor, Two single-phase loads are connected in parallel across a 415 V, 50 Hz supply. One load is rated 130 kW at a power factor of 0.75
1- Draw a circuit whose output goes to + V sat . When the input signal is below -4V. the output should be -V sat, when the input is above - 4V 2- Design a - 90 phase shift circuit at 1590 Hz , Then for your design calculate 0 at 15 Hz, & 15 KHz
What effect do internal capacitances in the transistor model have on practical performance of a real system? How would you use these model values to predict system performance?
Assume that a receiver has a first amplifier stage with a 5KW input resistance, a gain of 300, an input audio signal of 20 mV, and an operating temperature of 27oC. When the amplifier is operating with a bandwidth first of 10 MHz,
a. What is the range of the sensor voltage outputs initially and finally? b. What range of voltages would be expected to be measured 2 sec after the step change is applied?
Why then do we even use JFETs as amplifiers What is it that make them attractive even though they are non-linear? How do we minimize the effect of their non-linearity
Calculate the de Broglie wavelength, for: (a) An electron with kinetic energy of (a) 1.0 eV, and (ii) 100 eV. (b) A proton with kinetic energy of 1.0 eV. (c) A singly ionized tungsten atom with k in.
Problem Feeder - Transformer, A single-phase load is supplied through a 35 kV feeder whose impedance is 115 + j380 Ohms and a 35 kV, 2400 V transformer whose equivalent impedance is 0.26 + j1.21 Ohms referred to its low voltage side.
Point charge 1.5{\rm \mu C} is located at x = 0, y = 0.30 {\rm m}, point charge -1.5{\rm \mu C} is located at x = 0 y = -0.30 {\rm m}. What are (a)the magnitude and (b)direction of the total electric force that these charges exert on a third point..
a) If the internal resistance of a voltmeter is 100x bigger than the output impedance of a circuit, what is the loading error b) If the internal resistance of an ammeter is 10x smaller than the output impedance of a circuit
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