Electrical Machines A 500 V, 55 kVA single phase alternator has an effective resistance of 0.5 Ω. An excitation current of 10 A produces 200 A armature current on short circuit and an emf of 450 V on per circuit. The synchronous reactance will be 2.74 Ω. 2.241 Ω. 25.564 Ω. 2.781 Ω. 2.74 Ω. 2.241 Ω. 25.564 Ω. 2.781 Ω. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines When the rotor of a 3 phase induction motor is blocked then the slip is 0.54. 1. 0.3. 0.7. 0.54. 1. 0.3. 0.7. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The application that need frequent starting and stopping is lifts and hoists. blowers. paper mills. jaw crushers. lifts and hoists. blowers. paper mills. jaw crushers. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If Kh is hysteresis constant, f is supply frequency, Bm maximum flux density in core of transformer, the expression of hysteresis loss in transformer, is given by KhfBm3. Khf2Bm1.6. KhfBm1.6. KhfBm. KhfBm3. Khf2Bm1.6. KhfBm1.6. KhfBm. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The speed of a DC series motor is Inversely proportional to the armature current. Proportional to field current. Proportional to the armature current. Proportional to the square of the armature current. Inversely proportional to the armature current. Proportional to field current. Proportional to the armature current. Proportional to the square of the armature current. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Consider the following statements : For a level compounded dc generator to run at constant voltage, the series field mmf must effectively compensate 1. armature reaction mmf 2.armature resistance drop 3. brush contact voltage drop Which of these statements is/are correct ? 1 and 3 1 and 2 1, 2 and 3 2 alone 1 and 3 1 and 2 1, 2 and 3 2 alone ANSWER DOWNLOAD EXAMIANS APP
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