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A three-phase, 400-V, wye-connected induction motor takes the full-load current at 45 V with the rotor blocked. The full-load slip is 4%. Calculate the tappings k on a three-phase autotransformer to limit the starting current to 4 times the full- load current. For such a limitation, determine the ratio of starting torque to full-load torque.
Explain the Construction of Synchronous Machines? Basically all synchronous machines require a DC excited field winding in order to produce magnetic flux. For majority of machi
explain the properties and the application of high resistivity materials related with tunsten and carbon?
What is asynchronous data transfer? It is a data transfer method which is used when the speed of an I/O device does not match with the speed of the microprocessor. Asynchronous
what do you mean by band in communication? how it differs from bandwidth?
Two pure sine waves have similar amplitude "A" and frequency "f." They are out of phase through 180 degrees. If these two signals are added, the resulting waveform will be:
Q. A 230-Vdc shuntmotor delivers 30 hp at the shaft at 1120 r/min. If the motor has an efficiency of 87% at this load, find: (a) The total input power. (b) The line current.
Q. Given that V 0 = 10 V, determine IS in the circuit drawn in Figure.
What are Shift Register Counters? Two of the main common types of shift register counters are the Ring counter and the Johnson counter and They are basically shift registers wi
Q. Cause of sparking at the brushes of a DC Motor? Ans: Sparking at the brushes can be occur due to poor quality of carbon brushes, loose connection, poor armature of carbon
a) Write down a short note on compensators. b) Classify filter with relevant sketches. c) Illustrate the principle and working of Analog to Digital converter.
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