Electrical Machines Quadrature axis synchronous reactance is the ratio of Vmin to Imax. Vmax to Imin. Vmin to Imin. Vmax to Imax. Vmin to Imax. Vmax to Imin. Vmin to Imin. Vmax to Imax. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following factors improve commutation in a dc machine ? 1. High contact resistance of brushes 2. High inductance of the coils undergoing commutation 3. Shifting of brushes in the direction of rotation for a generator and in the opposite direction For a motor 4. Narrow width for the commutation bars Select the correct answer using the codes given below : Codes : 1 and 3 1, 2 and 4 2, 3 and 4 1, 2, and 3 1 and 3 1, 2 and 4 2, 3 and 4 1, 2, and 3 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The wound rotor type IM is used for____________ speed operation. variable. constant. minimum. maximum. variable. constant. minimum. maximum. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In DC generator, lap winding is used in high current and low voltage applications. where constant speed is required. where greater load is connected. high voltage and low current applications. high current and low voltage applications. where constant speed is required. where greater load is connected. high voltage and low current applications. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines R1 is the resistance of the primary winding of the transformer. The turn ratio in terms of primary to secondary is K. Then the equivalent resistance of the primary referred to secondary is K×R1 K²R1 R1 /K R1 /K² K×R1 K²R1 R1 /K R1 /K² ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The heat transfer by convection in a transformer least depends on temperature difference. color of the paint. air velocity. surface area. temperature difference. color of the paint. air velocity. surface area. ANSWER DOWNLOAD EXAMIANS APP
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