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1) A 40-hp, 500 V, 1200-rpm DC shunt motor has rotationallosses of 2000 W at rated speed. The armature resistance is 0.46Ω and the field resistance is300Ω. A) Calculate the armature current when the motor is delivering rated load at rated voltage andrated RPM. B) Determine theelectromagnetic torque, shaft-output torque, and efficiency ofthe shunt wound motor.
2) A 15 hp, 440 V, 1250 rpm separately excited dc motor drawsan armature current of 30 A at rated load. The no-load armature current is 5.0 A. Thearmature resistance is 0.75 Ω. Consider that the rotational losses (core + mechanical) areproportional to the speed. Neglect the field winding losses. The field current is kept constant and themachine is not saturated. For a 360 V armature voltage, the recorded shaft speed is 1000 rpm. Find:A) The value of the armature current and type of operation of the machine(motor/generator); B) The electromagnetic(induced/converted) power and torque; C) The shaft power andtorque; D) The efficiency of the machine; E) What would be the shaft speed and torque requiredfor the machine to supply (generator mode) 15 hp to a 440 V dc bus? Any problems withthis operating condition?
An AB latch operates as follows: If A = 0 and B = 0, the latch state is Q = 0; if either A = 1 or B = 1 (but not both), the latch output does not change; and when both A = 1 and B = 1, the latch state is Q = 1.
a) Determine C that will lead to a resonant frequency of w0=10^8 rad/s. b) Determine the resistance R that will lead to a resonant Q of 100. c) Determine the resistance R that will lead to a resonant Q of 1. d) For parts b) and c), what is the fra..
A power supply, when connected to a radio, provides 5V to the radio. When connected to a lamp, it provides 4V to the lamp. Assume the radio can be modeled as 6ohm resistor and the lamp can be modeled as a 0.7ohm resistor.
A 22KVA, 2300/230 VAC, 60HZ transformer is tested with a short circuit test. The measured data are as follows: Psc=280W, Vsc=80VAC and Isc=9.5 A 1. Find the transformer turns ratio of the transformer
Design a high-pass op amp filter with a high-frequency gain of -100 and a cutoff frequency of 1kHz. Resistors with values of 1kohm, 10khom, and 100kohm are available. Determine the capacitance and resistance values of the filter.
A series motor runs at 600 rpm when taking 110 amps from a 230 V supply. The resistance of the armature circuit is 0.12 ohms and that of the series winding is 0.03 ohms. Calculate the speed when the current has fallen to 50 amps
A 30kVA, 50 Hz, 4 pole alternator connected to an infinite bus at rated voltage has Xd = 1.00pu and Xq = 0.6 pu. For zero excitation find the output interms of rated power that the machine can deliver without loss of synchronism.
Write an asm HCS12 program to flash LEDs on a dragon+ board three times when SW5 is pressed with a 5 kHz frequency, and 50% duty cycle clock signal. Generate a clock signal with 5 kHz frequency, and 50% duty cycle.
Give three advantages of a three-phase system over a single-phase system There are two basic three-phase connections, the wye connection and the delta connection. Draw a labelled diagram showing the wye connection
Design a square wave oscillator using the op-amp that provides the output signal with amplitude of 4V to 6.5V and a frequency of 1kHz.
An amplifier represented with an input resistance of 10k ohm, an output resistance of 1k ohm, and the open circuit voltage gain of 1000 V/V is connected to a signal source of 10 mV peak amplitude with an internal resistance of 100k ohm.
A DC motor is driving a load given by TL = 3 + 0.02ωLNm , where ωL is the speed in rad/sec. The armature resistance of the motor, Ra = 2Ω . The machine constants at rated flux density, kE=kT=0.4 (inSIunits).
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