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A transformer of rating 20 kVA, 2000/200 V has the following parameters:
Core loss at rated voltage = 95 W
(a) Calculate transformer efficiency when delivering 20 kVA at 200 V at 0.8 pf lagging
(b) What voltage must be applied on the HV side for load as in part (a).
(c) Find the percentage voltage regulation.
A charged particle (charge q, mass m) is moving under the influence of a magnetic field B = B0 az. If the velocity vector of the particle is v = v a ax +- vy ay + vx az Show that the acceleration of this particle lies in the x-y plane.
What will be the minimum ground plane impedance at 600 MHz?
A line of charge with line charge density PI C/m is placed at the center of the inner shell. Calculate the magnitude and direction of the polarization vector inside the two dielectrics.
A pacemaker is programmed to deliver pulses a certain times every minute for a patient with heart block. A 0.5µF capacitor controls the pulse discharges through a 2M resistor. One pulse is delivered every time the fully charged capacitor loses 50%
The noise signal is measured to be 1.35 V. The output difference signal is 3.95 V and the common-mode output signal is0.95 mV. Determine the common-mode gain, the differential mode gain, the CMRR, and the CMR (in dB) for the amplifier.
What is the de Broglie wavelength of an electron at 150eV. what is the wavelength for electrons at 10keV, which istypical of electron microscopes. Comparing this to visiblel light,comment on the advantages of electron microscopes.
in the bottom of the 9th inning, the bases are loaded and the braves are down by three runs. chipper johns steps to the plate. twice he swings and misses. The crowd heads for the exits. the next pitch is a fast ball down the middle.
For a BJT common Emitter Amplifier, the AC base voltage = 1,2Vrms, Av=50, Bdc=150, Bac=200, alpha dc =0.98 and an RE of 500 ohm. What is the AC P-P voltage
1.A liquid has an enthalpy of vaporization of 30.8 kJ/mol. At 275 K it has a vapor pressure of 117 mmHg. What is the normal boiling point of this liquid 2. In a certain mountain range, water boils at 94°C. What is the atmospheric pressure under the..
A coil of wire contains 50 square turns, each one 5 cm long and 3 cm wide, and has a current of 30 A running through it. it is placed inside a magnetic field of 0.55 T at a 60 degree angle. what is the torque on the loop from the magnetic field
what are the advantages of using wind for power and how does wind actually generate powerthe mechanical side of
The electromagnetic wave that delivers a cellular phone call to acar has a magnetic field with an rms value of 1.38E-10 T. The wavepasses perpendicularly through an open window, the area of which is0.244 m2.
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