Hello Engineers. 1. In an alternator, voltage drops occurs in (A) armature resistance only (B) armature resistance and leakage reactance (C) armature resistance, leakage reactance and armature reaction (D) armature resistance, leakage reactance, armature reaction and earth connections. Ans : C 2. As the speed of an alternator increases (A) the frequency increases (B) the frequency decreases (C) the frequency remains constant but power factor decreases (D) none of the above. Ans : A 3. The armature reaction of an alternator influences (A) windage losses (B) operting speed (C) generated voltage per phase (D) waveform of voltage generated. Ans : C 4. The power output of an alternator is 40 kW and KVAR component is - 25. What will be the value of tanφ (φ being the power factor angle) ? (A) 0.625 lagging (B) 0.625 leading (C) 0.375 lagging (D) 0.375 leading. Ans: B 5. If the input to the prime mover of an alternator i...
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