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Q. Characteristics of Transformer?
The characteristics of most interest to power engineers are voltage regulation and ef?ciency. The voltage regulation of a transformer is a measure of the change in the magnitude of the secondary voltage as the current changes from no load to full load while the primary voltage is held ?xed. This is de?ned as
in which the I2R loss is obviously load-dependent, whereas the core loss is considered to be constant and independent of the load. It can be shown that the core loss should be equal to the copper loss for maximum operating ef?ciency at a given load.
The rated core loss can be approximated by the power input in the open-circuit test in which one winding is open-circuited and rated voltage at rated frequency is applied to the other winding.
The rated copper loss (at full load) can be approximated by the power input in the short-circuit test, in which one winding is short-circuited and a reduced voltage at rated frequency is applied to the other winding such that the rated current results.
The energy ef?ciency generally taken over a 24-hour period, known as all-day ef?ciency,is also of interest. It is given by
Q. Show the Subtraction Method? For this procedure (method), start with a weighted position value greater that the number. If the number is greater than the weighted position f
Q. We have discussed three different color spaces: RGB, HSI and CMY(K). Specify the need for multiple color spaces. Why can we not use only one? Q. A telescope in an observatory
XOR gate BY using NAND gate Only
(a) Estimate the hysteresis loss at 60 Hz for a toroidal (doughnut-shaped) core of 300-mm mean diameter and a square cross section of 50mmby 50mm. The symmetrical hysteresis loop f
Q. The response y(t) of a linear system to a unit-step excitation is y(t) = (4 - 10e -t + 8e -2t )u(t). (a) Find the system function. (b) Find the frequency at which the fo
This assignment is intended to provide an easier analysis of how windows work. Begin by looking at individual spectrum bins as affected by off-bin-centred frequency components with
Installation of Meters and Verification of Connections Apart from testing and calibrating the meters they must be properly installed as per the links diagram. The points in wh
Draw the circuit of transistor in the common base configuration. Draw the Active, saturation and cut-off region. List the characteristics of Ideal Op-Amp. Sketch the pin diagram
How is bias compensation in transistor is done using thermistors and sensistor
design a single phase circuit from a supply point to a load
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