Generalized Machine TheoryAttempt ALL Questions.Q1. (a) Explain and illustrate the object of the performance analysis of any type ofmachine by unified theory.[8M]

The objective of performance analysis for any machine, as outlined by unified theory, is to…

Answered: Generalized Machine Theory Attempt ALL…

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter27: Single-phase Transformers

Section: Chapter Questions

Problem 6RQ: What is a disadvantage of an autotransformer?

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A machine having class B insulation attains a temperature of 208°C (by resistance) in a torrid ambient temperature of 180°C. a. What is the temperature rise? b. Is the machine running too hot and, if so, by how much?
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• A DC shunt machine while running as generator develops a voltage of 250 V at 1000 r.p.m. on no-load. It has armature resistance of 0.5 ohm and field resistance of 250 ohm. When the machine runs as motor, input to it at no-load is 4 A at 250 V. Calculate the speed and efficiency of the machine when it runs as a motor taking 40 A at 250 V. Armature reaction weakens the field by 4 %
a) A six-pole, lap-wound, 220 V, shunt-excited d.c. machine takes an armature current of 2.5 A when unloaded at 950 r/min. When loaded, it takes an armature current of 54 A from the supply and runs at 950 r/min. The resistance of the armature circuit is 0.18 S2 and there are 1044 armature conductors. For the loaded condition, calculate: the induced e.m.f. CS Scanned with CamScanner i. ii. the useful flux per pole. iii. the torque developed by the machine in Nm.
The following information is given for a 300kW, 600V, long shunt compound DC generat or, shunt field resistance is 75 ohms, armature resistance 0.01, brush resistance is 0.011 ohrms, series field resistance is 0.012 ohms and the divert or resistance of 0.036 ohms.When the machine is delivering full load; a. Draw the circuit diagrarn b. Calculate the voltage and C Power generated by the armat ure.
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2gen. A and B operate in parallel. The station capacity of A is 50MW and that of B is 25MW. The full load speed regulation of station A is 3% and of B is 3.5%. Find the load sharing of 50MW between both the machine and the no load frequency is 50Hz.
A d.c. shunt machine generates 250-V on open circuit at 1000 r.p.m. Effective armature resistance is 0.5 ohm, field resistance is 250 ohm, input to machine running as a motor on no load is 4 A at 250 V. Calculate speed of machine as a motor taking 40 A at 250 V. Armature reaction weakens field by 4%
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Solve and show illustration A 20-kW 127.4 -V separately excited dc machine is operated at a constant speed of 2702 rpm with a constant field current such that the open-circuit armature voltage is 127.4 V. the armature resistance is 0.03 ohm. Compute the armature current when the terminal voltage is 133. a. 186.67 A b.-186.67 A c. 8680.00 A d. 0 A

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Generalized Machine Theory Attempt ALL Questions. Q1. (a) Explain and illustrate the object of the performance analysis of any type of machine by unified theory. [8M]