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What is the formula for the active power in the cylindrical rotor synchronous machine? (Eb represents armature emf, Vt represents terminal voltage, δ represents rotor angle, X represents reactance)(a) Eb×Vt×sinδ÷X(b) Eb×Vt^2×sinδ÷X(c) Eb^2×Vt×sinδ÷X(d) Eb×Vt×sinδ÷X2This question was posed to me at a job interview.This intriguing question originated from Dynamics topic in chapter Dynamics of Electrical Drives of Electric Drives

Answer»

Right option is (a) Eb×Vt×sinδ÷X

For EXPLANATION: The real POWER in the cylindrical rotor MACHINE is Eb×Vt×sinδ÷X. It is inversely PROPORTIONAL to the reactance. The stability of the machine is decided by the maximum power transfer capability.



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