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Q. Frequency-controlled induction-motor drives ?
The converters employed for variable-frequency drives can be classified as:
• Voltage-source inverter (which is the only one considered here)
• Current-source inverters
• Cycloconverters, which allow a variable-frequency ac supply with voltage-source or current-source characteristics obtained from a fixed-frequency voltage source.
Acommon symbol for the self-commutated semiconductor switch is shown in Figure. The control signal (either voltage or current) is denoted by CS, and the diode gives the direction in which the switch can conduct current. GTOs, power transistors, and MOSFETs are classified as self-commutated semiconductor devices because they can be turned off by their respective control signals: GTOs by a gate pulse, a power transistor by a base drive, and a MOSFET by a gate-to-source voltage. A thyristor, on the other hand, is a naturally commutated device that cannot be turned off by its gate signal. A thyristor combined with a forced commutation circuit behaves like a self-commutated semiconductor device, however. The self-commutation capability makes its turnoff independent of the polarity of the source voltage, the load voltage, or the nature of load. Self-commutated semiconductor switches are suitable for applications for converters fed from a dc source, such as inverters and choppers.
if a resistor is present between 2 branches in such way that its polarities are different to compare with one another so how we choose polarity of that resistor
Q. What is a darlington pair? The Darlington circuit consists of two cascaded emitter followers with infinite emitter resistance in the first stage.
Question: a). For the circuit shown in figure state which operation is performed and draw the output waveform if measured between points A and B. The input signal is given in f
GIS APPLICATION IN THE POWER DISTRIBUTION ENVIRONMENT Previously, we have discussed the IT applications in the areas of Metering, Data Acquisition and Management, Asset Manage
Discuss the function of instruction queue in 8086? In 8086, a 6-byte instruction queue is presented at the Bus Interface Unit (BIU). It is used to pre fetch and store at the ma
Determine flux in the central limb: For the magnetic circuit shown in Figure the value of flux in the right limb is 0.48 m Wb and the number of turns wound on the central limb
Q Acharge of 0.1Cpasses through an electric source of 6 V from its negative to its positive terminals. Find the change in energy received by the charge. Comment onwhether the charg
Q. Sampling of digital communication systems? Sampling of an analog signal makes it discrete in time. A bandlimited signal can be recovered exactly from its samples, taken peri
What are the hardware elements in the embedded systems? Hardware Elements in the Embedded Systems are as follows: (i) Power Source (ii) Clock Oscillator Circuit and Clock
everything about function generator
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