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A 150-MVA 15/200-kV single-phase power transformer has a 0.018ohm resistance and a 0.075ohm reactance. The magnetizing impedance is j80 per unit.
a.) Find the equivalent circuit referred to the low-voltage side of this transformer.
b.) Calculate the voltage regulation of this transformer for a full-load current at power factor of 0.8 lagging.
c.) Calculate the copper and core losses in transformer at the conditions in (b).
d.) Calculate efficiency.
Describe the steps in the keypad polling routine. Draw a flow chart for the keypad LCD software code. Discuss challenges experienced in developing the keypad LCD software code.
An LVDT is used in an accelerometer to measure seismic-mass displacement. The LVDT and signal-conditioning output is 0.31mV/mm with +/-2cm maximum core displacement.
Frequently, the output of transducers are much smaller than what an A/D converter expects on its input. That would require an amplifier to match it. Sometimes the output does not start at 0V. Usually the minimum reference input voltage of an A/D
A calibrated RTD with ALPHA = 0.0041/°C, R = 306.5 Ohms at 20°C, and PD = 30 mW/°C will be used to measure a critical reaction temperature. Temperature must be measured between 50° and 100°C with a resolution of at least 0.1°C.
Discuss the steps required in calculating the collector-emitter voltage in a VDB circuit. Why does this circuit have a very stable Q point Discuss whether transistors being used as switching circuits should be biased in the active region.
a. Convert all the per unit values to a common kVA of 100 and transmission side voltage base of 2500V b. To maintain one per unit voltage at rated load, find the per unit generator voltage needed.
The output power of the digital transmitter is 0 dBm and the link has a constant attenuation of 50.0 dB. At the input to the receiver, the equivalent AWGN noise power is – 70 dBm. Assume implementation margin is 0 dB when calculating BER in ..
Three-phase inverter has Y-connected load of 10 ohm and 23mH inductance. The inverter frequency is 60Hz and the dc input voltage is 200v. Calculate line voltage rms? , Phase voltage, rms?
A temperature transducer has the relationship R=200 + 10T where R is in ohms and T is in Celsius. The problem specifications are: Range is 30=T=50°C Resolution is 0.01°C Frequencies of interest are 0 to 100Hz Transducer dissipation constant is 20 mW..
A batch process which involves filling a tank with liquid, mixing the liquid and draining the tank, is automated with a PLC. The specific sequence of events is as follows
If the concentration of free electrons is 10^29 electrons per cubic meter and if they are uniformly dispersed throught the wire, then what is the average velocity of an electron ?
50 kg of a certain gas is contained within a piston-cylinder assembly. the gas undergoes a processwhich the pressure volume relationship is PV = constant. (n=1.5) the given conditions as follows : p1= 6 bars, v1=0.2 cubic meters ,and v2= 0.4 cubic..
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