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Consider a three-phase induction motor with a normal torque-speed characteristic. Neglecting the effects of stator resistance and leakage reactance, discuss the approximate effect on the characteristic, if:
(a) The applied voltage and frequency are halved.
(b) Only the applied voltage is halved, but the frequency is at its normal value.
The field resistance of a dc machine is 50 ohm at 20 o C. The resistance increases to 55 ohm at 50 o C. Find the temperature coefficient of the resistance material. Ans: Sol
Q. A current i(t) = 20 cos(2π × 60)t A flows through a wire. Find the charge flowing, and the number of electrons per second that are passing some point in the wire.
Tri State Devices Tri State devices have three states logic 1 logic 0 and high impedance. A tri state device ( Buffer/ Inverter) has three lines output enable as shown
Normal 0 false false false EN-IN X-NONE X-NONE
what is the reason for reduction in low frequency and high frequency regions in the frequency response of an Rc coupled amplifier?
Explain kinds of strain gauge bridge circuits and resistance strain gauges.
circuit used in window air conditioning
How to calculate Electrical losses by transformation
Stator Current Control Methods The torque and speed of an induction motor can be controlled by the stator current the motor behaviour is different from that with VS
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