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The weekly discharge of a typical hydroelectric plant is as under :
Day Sun Mon Tues Wed Thurs Fri Sat
Discharge(m3/sec) 500 520 850 800 875 900 546
The plant has an effective head of 15 m and an overall efficiency of 85%. If the plant operates on 40% load factor, estimate
(i) the average daily discharge
(ii) pondage required and
(iii) installed capacity of proposed plant.
An ideal PEM fuel cell with an cadency of 83% needs 30.35g of hydrogen to generate IkWh. For a real cell with half that efficiency, how much hydrogen per day woad be needed to power a house that uses 25kWh per day?
An electron is moving with a velocity of 2*10^6 cm/s. Determine the electron energy (in eV)), momentum, and de Broglie wavelength (in angstrom).
As more and more memory is squeezed onto a single chip, the numberof pins needed to address it also increases. It is often inconvenient to have large numbers of address pins on a chip. Devise a way to address 2^n words of memory using fewer than n..
A 24-volt automotive battery is connected to two headlights, such that the two loads are in parallel; each of the head lights isintended to be a 75-W load, however, a 100-W headlight is mistakenly installed.
A 3 phase fully controlled converter is feeding power into a dc load at constant current of 150 A .The RMS current through each thyristor of the converter is:-
Design a 7.5-V zener regulator circuit using a 7.5-V zener specified at 12mA. The zener has an incremental resistance r(z) = 30 ohms and a knee current of 0.5mA. The regulator operates from a 10-V supply and has a 1.2k-ohm load.
Two transformers, A and B, are both suitable. While both transformers have the same efficiency at peak load, most of the loss in A is due to core loss, and most of the loss in B is due to the resistances of the coils. From the standpoint of operat..
If the above electrode is used tomeasure the pH of arterial blood in vivo, and if the subject isbreathing at 0.5Hz, in the steady state how much will the true amplitude of the oscillation in pH be attenuated at the output of the pH electrode
A 0.51-kg block is hung from and stretches a spring that is attached to the ceiling. A second block is attached to the first one, and the amount that the spring stretches from its unstretched length triples.
The subatiomic research that can be conducted using particles and radiations from naturally radioactive substances is limited becuase the radioactive emissions:
Explain why the ionic contribution to the dielectric constant vanishes at frequencies greater than about 1GHz. 2. What is the relative permeability of a magnetic core material if the magnetizing field, H, saturates the core material?
The nameplate on a 50-MVA, 60-Hz single-phase transformer indicates that it has a voltage rating of 8.0-kV: 78-kV. An open-circuit test is conducted from the low-voltage side, and the corresponding instrument readings are 8.0kV, 62.1A, and 206kW.
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