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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.
(a) Show the equivalent NOR realizations of the basic NOT, OR, and AND gates. (b) Show the equivalent NAND realization of the basic NOT, AND, and OR gates.
Case 1 (B>A) Suppose XX = 01H ( stored in a) and YY = 03H (stored in B).then carry flag will set by CMP instruction since B>A in this case JNC will not transfer the e
Memory map of tpa in a personal computer and explain such of the areas in brief
A three-phase, wye-connected, four-pole, 400- V, 60-Hz, 15-hp synchronous motor has a synchronous reactance of 3 per phase and negligible armature resistance. The data for its no
Q. Write short note on Common vs. associated channel signalling. Associated vs. Common channel signalling: Out band signalling suffers from very limited bandwidth. Both a
Design a DC motor control system to run the 48V DC motor at 40rpm up to max load of the motor. You are responsible for designing the control of a 24V supply along with the speed s
Q. A depletion MOSFET is given to have large V A , V P = 2.8V, I DSS = 4.3 mA, v DS = 4.5V,and v GS = 1.2V. (a) Is theMOSFEToperating in the active region? (b) Find iD.
Q. Two coupled synchronous machines are used as a motor-generator set to link a 25-Hz system to a 60-Hz system. Find the three highest speeds at which this linkage would be possibl
1. Introduction : Theory: Frequency is the number of occurrences of a repeating event per unit time. It can also be defined as the number of repetitions (cycles) of a w
A microstrip antenna system operating at 915MHz must be designed using Rogers RO3010 substrate with the thickness of 0.635mm.
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