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30. In the circuit of Figure P28.30, determine (a) the cur- W rent in each resistor and (b) the potential difference across the 200-2 resistor. + 40.0 V 360 V 80.0 V + 200 Ω 80.0 Ω 20.02. Figure P28.30 70.02. +

Sketch a single-phase voltage sag event and explain its characteristics. List three potential causes of voltage sags.

The Chocolate Crumb Mystery Explosions ignited by electrostatic discharges (sparks) constitute a serious danger in facilities handling grain or powder. Such an explosion occurred in chocolate crumb powder at a biscuit factory in the 1970s. Workers usually emptied newly delivered sacks of the powder into a loading bin, from which it was blown through electrically grounded plastic pipes to a silo for storage. Somewhere along this route, two conditions for an explosion were met: 1. The magnitude of an electric field became 3.0 x 106 N/C or greater, so that electrical breakdown and thus sparking could occur. 2. The energy of a spark was 150 mJ or greater so that it could ignite the powder explosively. Let us check for the first condition in the powder flow through the plastic pipes. Suppose a stream of negatively charged powder was blown through a cylindrical pipe of radius R = 5.0 cm. Assume that the powder and its charge were spread uniformly through the pipe with a volume charge density…

B) A 60-Hz generator is supply ing 60% of P max to an infinite bus through a reactive network. A fault occurs which increases the reactance of the network between the generator internal voltage and the infinite bus by 400%. When the fault is cleared, the maximum power that can be delivered is 80% of the original maximum value. Determine the critical clearing angle for the condition described.

E-06, PC-05. Why are the iron cores of most induction coils laminated? To increase the core permeability. To reduce the core reluctance. To reduce the effects of eddy currents. Click Save and Submit to save and submit. Click Save All Answers to save all answers. MacBook Air 吕0 F2 F3 F4 F5 $4 & 4 5 O 6 7 7 W .. E R .... S » D S F G # 3

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Describe the operation of a synchronous condenser and its applications in power systems. How does it provide reactive power support and voltage stability?

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