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A 3000 pF power capacitor has maximum power and voltage ratings of 200 kV A and 15 kV respectively. Its dissipation factor can be assumed to be constant at 0.001. Under particular ambient conditions, and operating at 5 kV (r.m.s.) and 100 kHz, its temperature is 10 °C above the 30 °C of the surroundings. Assuming the same ambient conditions, estimate the temperature of the unit when it is operating at
(i) 5 kV (r.m.s.) and 300 kHz and
(ii) 10 kV (r.m.s.) and 150 kHz. Calculate the reactive current carried by the capacitor, the e.s.r. and the dissipated power under each of the two operating conditions
Two rolled-steel channels are to be welded back to back and used to support the loading shown. Knowing that the allowable normal stress for the steel used is 30 ksi, determine the most economical channels that can be used.
A case study analysis of a health and safety accident in the New Zealand workplace. The workplace should be related to your chosen discipline.
The dissociation energy of a carbon-bromine bond is typically about 210 kJ/mol. What is the maximum wavelength of photons that can cause C-Br bond dissociation?
An engineer working in asatellite station complex has received the program by an earthstation and routed the signal through a rectangular waveguide ofdimensions (axb=2.4x1.2) to control room 12.2m away fromthe station feed horn.
By now, you should have been up in the PLC lab getting familiar with the HMI and how to program it; how to define new screens, label them, and access them from the F# tabs below; and how to design Icons/Images from the Library that links HMI image..
Two transistors have EBJ areas as follows: AE1 = AE1 = 400μm x 400μm and AE2 = 0.4μm x 0.2μm. If the two transistors are operated in the active mode and conduct equal collector currents
In a DSB-SC amplitude modulation system, the message signal is m(t)=e^-3t*u(t-2) and the carrier signal is cos(2000pi*t). Find and sketch the Fourier transform of the modulated signal.
Find the change in resistance of an electrical resistance strain gauge with a gauge factor of 2.0 and a resistance of 100 Ω when subject to a strain of 0.001.
The instantaneous power p into a one port containing resistors and inductors has maximum value 100(1+sqrt2) W and minimum value 100(1-sqrt2)W. (note that instantaneous power is measured in W, and it contains various contributions
a series rlc circuit has a 4ohm resistor an inductor with an xl of 19.5 ohms and a capacitor with an xc of 12 ohms.
You are repairing a guided transmission system made up oftransmitter module, coaxial link and a receiver. The receiver'serror rate has jumped dramatically recently after an electrical storm when several repairs were made to the system.
A MOSFET is used in a boost-buck converter. The on-state loss is 4.2 W, and the switching loss is 2.8 W. The device is in TO-220 heat-sink package. it is desired to avoid a heat sink, and a parallel connection has been suggested.
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