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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.
what is the time of short circuit ?
A permanent magnet DC motor is being considered for use as a drive motor for a vehicle. The motor is known to have the following properties No load speed @ 100 V = 2000 rpm torq
Shunt Capacitors Line losses owing to poor PF can be decreased through improving the PF. Overall improvement in the operating condition can be brought about through reducing t
what is couple circuit ?
1. Pattern recognition A synchronous sequential machine is to generate 1 on output z after the next clock pulse whenever the bit sequence on input x has exactly two 0’s in the last
Q. Can you explain twos Complement Division? 2's complement division is repeated 2's complement subtraction. The 2's complement of the divisor is calculated, and then added to
#I want to get lecture notes on Electronic device.and circuits .
Give the alternate functions for the port pins of port3? RD - Read data control output. WR - Write data control output. T1 - Timer / Counter1 external input or test pin.
I have made a wind turbine with vertical blades. I want to rotate magnets on the rotor with the coils being stationary.How do I wind the coils and must the magnets be N/S opposite
Magnetic circuits To see how this is used in practice, consider a coil of N turns wound onto a closed ring shaped former with a very high (note: r (steel) = 200
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