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Write a note on superconductors.
Superconductors- The resistivity of most metals rises with increase in temperature and vice-versa. Some metals and chemical compounds are there, whose resistivity becomes zero while their temperature is brought near 00Kelvin (-2730C). At that stage these metals or compounds are be have attained superconductivity. Illustration - mercury becomes superconducting at about 4.5 Kelvin (-268.50C). Superconductivity was discovered through Heike Kamerlingh Onnes. The transition make normal conductivity to superconductivity takes place almost rapidly; this occurs over a very narrow range of temperature regarding 0.050K. The temperature at that the transition takes place from the state of normal conductivity to that of superconductivity is termed as transition temperature. Superconductors are utilized for producing very magnetic fields of approximately 50 Tesla. Magnetic energy can be stored in huge superconductors and drawn as needed to counter the voltage fluctuations throughout peak loading. Superconductors can be utilized to perform logic and storage functions in computers. Since there is no, I2R losses in a superconductor, therefore power can be transmitted by the superconducting cables without any losses. Superconducting property can be vanished by applying external magnetic field as in figure (b). In figure (b) HC is critical magnetic field and TC critical temperature.
Is there an opto-coupler that has a blocking voltage, VRRM, of greater than 800 volts? Perhaps, 1200 or 1600 volts? The manufacturer?
Q. Explain, with the aid of diagrams, the following in relation to the construction of power transformers. Include the advantages and disadvantages in your description. a) Core
Add the Contents of Register This instruction is used to add the contents of register R with the contents of accumulator and result of operation is stored in the accumu
Q. Demonstrate how finite state machine model helps in designing a switching system and give a typical illustration. Ans: Switching systemessentially belongs to class of fi
Why armature core in a DC machine is constructed with laminated steel instead of solid steel sheets
Q. WEIGHTED-RESISTOR CONVERTER? Figure shows a 4-bit weighted-resistor D/A converter which includes a reference voltage source, a set of four electronically controlled switches
What is finger voltage in a scr?
ADC Instruction This instruction is used to add the contents of any register of any register memory location and carry flag with the contents of accumulator and result i
Semiconductor Diode: the semi conductor diode is formed by simply bringing n and p tripe material together (constructed from same base ge and si), at the instant the two mater
Q. The flux in a magnetic core is alternating sinusoidally at a frequency of 500 Hz. The maximum flux density is 1 T. The eddy-current loss then amounts to 15W. Compute the eddy-cu
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