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A 3-phase ring main ABCD fed at A at 11 kV supplies balanced loads of 50 A at 0.8 p.f. lagging at B, 120 A at unity p.f. at C and 70 A at 0.866 lagging at D, the load currents being referred to the supply voltage at A. The impedances of the various sections are :
Section AB = (1 + j 0.6) Ω ; Section BC = (1.2 + j 0.9) Ω
Section CD = (0.8 + j 0.5) Ω ; Section DA = (3 + j 2)Ω
Calculate the currents in various sections and station bus-bar voltages at B, C and D.
The cast steel torroid shown below has a rectangular cross-section. If the flux in the core is known to be 7.75mWb and the coil has 200 turns, determine the current in the coil. dimensions on the torrid. 300mm id; 400mm od; 100mm tall
what is transmission velocity and how it is different from drit velocity. Drift velocity the actual (physical) velocity of electrons along the wire.
Discuss which display technologies would be most appropriate for viewing DVD movies in the following situations. (i) A home entertainment system in a living room (ii) A personal seat-mounted display on an aircraft
What are the transfer function and the impulse response of the system?
A plane circular disk of radius 0.25m rotates at a speed of 200 rad/s about an axis through the center of the disk perpendicular to the plane of the disk. There is a uniform magnetic flux B = 1 Tesla parallel to the axis of rotation.
Draw a schematic of the set up and calculate the force on the bar.
In a MOS cascode amplifier, the cascode transistor is required to raise the output resistance by a factor of 40. (1) If the transistor is operated at Vov=0.2V, what must its VA be
A series-connected circuit has a 240-V voltage source, a 10- resistance, a 5- resistance, and an unknown resistance Rx. The voltage across the 5-? resistance is 30 V. Determine the value of the unknown resistance.
Calculate the received power and the path loss. Assuming this is the maximum acceptable path loss for the system, how does the maximum system range change at 1 GHz and 10 GHz, assuming all other parameters remain constant
Given 100-MHz clock signal, derive a circuit using D flip-flops to generate 50-MHz and 25-MHz clock signals. Draw a timing diagram for all three clock signals, assuming the flip-flops introduce no delay.
A 150 MVA, 24 kV, 123% three-phase synchronous generator operates with an induced voltage that is twice the rated line-to-neutral voltage. Calculate the three-phase steady-state short circuit current.
A 40-hp, 500 V, 1200-rpm DC shunt motor has rotationallosses of 2000 W at rated speed. The armature resistance is 0.46Ω and the field resistance is300Ω. A) Calculate the armature current when the motor is delivering rated load at rated voltage and..
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