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1. Why is it desirable to short circuit the dc field when a synchronous motor is started?
2. Briefly describe the phenomenon of "hunting" in a synchronous motor. How is it rectified?
3. Explain briefly the process of synchronizing a synchronous motor to the bus-bars. What conditions determine the instant of synchronization?
Research power plant systems
A full-wave rectifier is to be designed using the bridge circuit configuration. The peak output voltage is to be 9 V, the nominal load current is to be 100 mA, and the ripple voltage is to be limitedto Vr= 0.2 V.Assume Vγ= 0.8 V and let vI= 120√2s..
The manufacturer's data sheet for a 26-kV, 750-MVA 60-Hz three-phase synchronous generator indicates that it has a synchronous reactance Xs = 2.04 and a leakage reactance Xal = 0.18, both in per unit on the generator base. Calculate
Zener diode, Can You show me how to solve the following: If a 5k resitor is connected between the cathode of a 6.2V ZENER diode and a 12V power supply.
Consider a person with a skin/fat layer of thicknessL= 3 mm and effective
A conducting sphere of radius R is spinning at an angular speed ! in presence of an uniform magnetic field ˆzBo. Find the emf induced between north pole N and any point on the equator E. Hint- what is the emf induced between two end points
What percentage change in the voltage gain with feedback would be produced by a 50 per cent change in the voltage gain of the basic amplifier due to a change in the load? The loading effect of the feedback network can be neglected.
Use the upstream wind power relation to calculate the power in a 5-mph wind if the circular wind swept area has a diameter of 2 meters, and the elevation (altitude) is that of Logan, Utah. [Reference: Google: Images for air density vs. altitude]
Write an equation to help determine P-type body doping concentration Na for a required threshold voltage V (sub TN) for an N-channel Al-Sio(sub 2) -Si MOSFET.
Determine the turns ratio of each transformer and the line current at the 120 kV side.
On the z-axis is an infinite line of charge density ρL =2(C/m) . For ρ
calculate the force at the same point as (b)on the test charge of +1.00 coulombs due to the positive charge +Q
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