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State the main requirements of a protection CT and an instrument CT. A 400 A circuit is to be protected by a CT and relays. The relays present a 2.5 VA burden. If the setting is 20% and there is saturation of 50% at 20 x current setting, specify a suitable CT.
Calculate the length and the distance coved by the lightening arrestor to be installed above 20 feet height industrial building.
A 1cmx2cm rectangular wire loop carries a current of 2A. What is the magnetic field at the center of the rectangle
a. What is the expected amplification of a BJT transistor amplifier if the dc supply is set to zero volts. b. What will happen to the output ac signal if the dc level is insufficient.
Adding dopants to a sample of silicon is found to reduce the Hall coefficient by a factor of 10 and increase the conductivity by a factor of 5. What effect has this dopant addition had on the mean free path
a) What is the key difference between coherent and non-coherent demodulation b) Explain the concept of differential encoding for BPSK modulation.
Suppose that a public address system emits sound uniformly in all directions and that there are no reflections. The intensity at a location 26 m away from the sound source is 3.0 × 10-4 W/m2. What is the intensity at a spot that is 72 m away
A 65 kVA load with a lagging power factor is combined with a 25 kVA synchronous motor load which operates at pf = 0.60 leading. Find the power factor of the 65 kVA load, if the overall power factor is 0.85 lagging.
the energy crisis - what are your thoughts to this student. it is my opinion that we should begin to loosen our
use a third-order low pass filter with a -3dB frequency of 10 Hz to filter your signal. What sampling rate should you use to make sure any potentially aliasing frequencies are attenuated by at least -40 dB for a. A butterworth filter
An emitter-follower circuit is built using an npn transistor with ß=100 and with RE =1k-ohm. What is the input impedance of the open circuit. If a load of 100-ohm is connected to the output of the circuit, what is the input impedance
A 1.0000 V signal is converted to an 8-bit binary signal throughand ADC. The signal is then fed back into an 8-bit DAC. assummingthat both ADC and DAC range from 0 to 5.0 V, what would the outputvoltage of the DAC be
What is the minimum sampling rate that can be used to obtain samples that completely specify the following signalx(t) = 10cos(20*pi*t) - 5cos(100*pi*t) + 20cos(400*pi*t)
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