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Question -
(i) A star-connected, three-phase synchronous induction motor takes a current of 10 amps from a 415 volt supply at unity power factor when supplying a steady load. If the synchronous reactance is 5 ohms/phase and the resistance is negligible, draw the phasor diagram and calculate the value of the generated emf and the load angle.
(ii) If the excitation is reduced by 10% and, as a consequence the generated e.m.f. is reduced by 10%, calculate the new value of the generated e.m.f E, the stator current, the power factor and the load angle, assuming that the load does not change.
(iii) Comment very briefly on the effect that reducing the excitation has on the power factor, stator current and the load angle.
Determine the equivalent resistance Req between the terminals a and b in the following circuit.
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A 40 kHz sinusoidal voltage has zero phase angle and a maximum amplitude of 2.5 mV. When this voltage is applied across the terminals of a capacitor, the resulting steady-state current has a maximum amplitude of 125.67
Determine V for the current source of given figure(a) with an internal resistance of 10 kΩ.- Determine the resulting voltage V for figure(b), and compare it to that obtained in part (a).
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Find the image frequency for the following receiver. The RF frequency we are tuning is assumed to be 10 MHz. The local oscillator frequency is assumed to be equal to 11 MHz. These give us the intermediate frequency of 1 MHz. Give the image frequen..
A random variable X is normally distributed with mean u = 10 and standard deviation sigma = 1.5. Find the following probabilities: A. P(8 or equal 8.5).
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