# Electrical Engineering Objective Questions { Alternators }

134. Salient pole type rotors as compared to cylindrical pole type are

135. Which of the following relays come into operation in the event of the failure of prime-mover connected to the generator?

136. The per unlit vuaages of two synchronous machines connected through a lossless line are 0.95 L10? and 1.0 LO?. Match the two sides in the following

137. A 100 MVA, 11 kV, 3-phase, 50 Hz, 8-pole synchronous generator has an inertia constant H equal to 4 seconds. The stored energy in the rotor of the generator at synchronous speed will be H= ?

138. A synchronous generator connected to an infinite bus is overexcited. Considering only the reactive powe, from the point of view of the system, the machine acts as

139.  The neutral of 10 MVA, 11 KV alternator is earthed through a resistance of 5 ohms. The earth =fault relay is set to loperate at 0.75 A. The CT's have a ratio of 1000/5. What percentage of the alternator winding is protected?

140. A power station consists of two sychronous generators A and B of ratings 250 MVA and 500 MVA with inertia 1.6 p.u. and 1 p.u., respectively on their own base MVA ratings. The equivalaent p.u. inertia constant for the system on 100 MVA common base is

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