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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
The contents of compressed gas cylinders can range from highly flammable substances, such as hydrogen, propane and ethane (acetylene), to toxic gases, such as chlorine, sulphur dio
Q A12-V, 115-Ah automobile storage battery is used to light a 6-W bulb. Assuming the battery to be a constant-voltage source, find how long the bulb can be lighted before the batte
Q. Show Process of Speed Control of DC Motors? Equation showed that the speed of a dc motor can be varied by control of the field flux, the armature resistance, and the armatur
Crossovers are generally used with loudspeakers having multiple drivers. Loudspeakers with single drivers are unable to cover the entire frequency range i.e from low to high freque
Ginny Jones currently works as the VP-Product Strategy for a well-established enterprise software company. She and her friend, Tom Robinson, currently CFO at a competing firm (and
Q. Explain Internal Data Bus? Internal Data Bus: A bus which operates only within internal circuitry of the CPU, communicating among internal caches of memory which are part of
subranging ADC is a modification
i v characteristics of practical current source
Power Supply and Clock Frequency there are following pins for power supply and clock frequency signals. V CC + 5 V power supply. V SS Ground reference X 1
Q. Explain working of Single-Phase Induction Motors? For reasons of simplicity and cost, a single-phase power supply is universally preferred for fractional-horsepower motors.
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