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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?
A voltmeter is specified to have an accuracy error of ±0.1% of full-scale on a ±1V scale. If the meter produces a reading of 0.323VDC, what is the minimum and maximum DC levels that might have been present at the meter's input during this measurem..
A silicon NPN bipolar junction transistor is to be used as an amplifier. What are the required bias conditions for this to occur If the emitter voltage is -3V, pick an acceptable base voltage and an acceptable collector voltage for the transistor ..
A small buck converter has 24 V input and 12 V output. The transistor has Rds(on) - 0.1 Ohm. The diode is modelled as a 1.0 V drop. Each device has junction to ambient Rtheta(ja) = 40 K/W and Tjunction
ASSUME THE NSC HAS A NEW INSTRUCTION CALLED INC (OPCODE = "11") THAT INCRMENTS THE CONTENT OF THE OUT REGISTER; THE INC INSTRUCTION DATA FIELD IS UNUSED. ALSO ASSUME THAT THE LOC INPUT IINPUT IS TIED TO THE COMPLIMENT
Find the Thevenin and Norton equivalent circuits for the circuit. Take care that you orient the polarity of the voltage sourceand the direction of the current source correctly relative toterminals a and b.
A sinusoidal voltage with a peak-to-peak value of 15 v is applied to an RC high-pass filter. If the reactance at the input frquency is zero
A charge density of ohm Coulombs per square meter is uniformly distributed over a thin and very long cylindrical shell of radius a. You want to know the electric flux density field D and the electric field E generated by this charge at all points ..
Zener Diode and Series Resistance, In the zener diode circuit calculate the value of the current through the zener diode if the power supply is rated 24 volts at 500 milli amperes
a) What are the FIVE requirements for synchronizing the alternator tot he grid b) What should happen once the synchronous alternator is synchronized At that very instant, what should happen if the above five conditions are met
A 20-m3 tank contains nitrogen at 23 C and 600 kPa. Some nitrogen is allowed to escape until the pressure drops to 400 kPa and the temperature to 20 C. Determine the amount of nitrogen gas that has escaped in kg. How much in this in Kmoles
n RL series circuit is connected across a 100-v 1000-cycle source. The resistance and the inductance are so adjusted that the power absorbed is 1600 W. The current in the circuit is i= 28.28 sin6280t. Find R and L.
1. Point charges Q1 and Q2 are respectively, located at(4,0,-3) AND (2,0,1). If Q2=4nC, find Q1 such that a. E at (5,0,6) has no no z component b. The force on a test charge at (5,0,6) has no x component
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