141. Test (A) No load and Blocked rotor test (B) Sumpner's test (C) Swinburn's test (P) Transformer (Q) Induction machine (R) Synchronous machine (S) DC machine
142. Higher synchronous reactance is preferred in the present day alternators, because one can have
143. A there phase alternator is wound with a 60 degree phase-spread armature windings and develops 300 kVA. If the armature is reconnected utilizing all the coils for single phase operation with a phase spread of 180 degrees, the new rating of the machine is
145. A single-phase, 2000 V alternator has armature resistance and reactance of 0.8 ohms and 4.94 ohms respectively. The voltage regulation ofthe alternator at 100A load at 0.8 leading power-factor is
146. Xd, X'd and X"d are steady state d-axis synchronous reactance, transient d-axis reactance and sub-transient d-axis reactance of a synchronous machine respectively. Which of the following statements is true?
147. A 75 MVA, 10 kV synchronous generator has Xd = 0.4 p.u. The Xd value (in p.u.) to a base of 100 MVA, 11 kV is
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