Question

97. A 50 Hz, four-pole turboalternator rated at 20 MVA, 13.2 kV has an inertia constant
H = 4 kW sec/kVA. The K.E. stored in the rotor at synchronous speed is:
(a) 80 kilojoules
(6) 80 megajoules
(c) 40 megajoules
(d) 20 megajoules.
98. The breakdown strength of air at STP is 21 kV/cm. Its breakdown strength at 30°C and
72 cm of Hg will be:
(a) 21.25 kV/cm
(6) 20.2 kV/cm
(c) 23 kV
(d) 19.5 kV/cm.​

Answer 1

Answer:

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97.