A 200 MVA alternator operated at no load at frequency of 50 Hz, it has inertia constant of 5 MWsec/MVA and governing system has a time delay of 0.6 sec. If the load of 50 MW is suddenly applied then find the frequency deviation during this time?

• A.  0.76 Hz
• B.  0.85 Hz
• C.  -0.76 Hz
• D.  -0.85 Hz

Answer: (C)