Electrical Machines In a synchronous motor hunting can be reduced to minimum possible by using a flywheel. any of above methods. designing the motor for adequate synchronizing power. providing damper winding in the rotor pole faces. using a flywheel. any of above methods. designing the motor for adequate synchronizing power. providing damper winding in the rotor pole faces. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a synchronous generator with constant steam input supplies power to an infinite bus at a lagging power factor. If the excitation is increased power angle increase and power factor decrease both power angle and power factor increase power angle decrease and power factor increase both power angle and power factor decrease power angle increase and power factor decrease both power angle and power factor increase power angle decrease and power factor increase both power angle and power factor decrease ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following pairs is/are correct? semi closed slot-----leakage flux is moderate open slot----- leakage flux is less closed slot----- leakage flux is high All of these semi closed slot-----leakage flux is moderate open slot----- leakage flux is less closed slot----- leakage flux is high All of these 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 : 2, 3 and 4 1, 2 and 4 1 and 3 1, 2, and 3 2, 3 and 4 1, 2 and 4 1 and 3 1, 2, and 3 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Breather is provided in a transformer to absorb moisture of air during breathing. absorb moisture from air entering in transformer. provide cold air in transformer. filter the transformer oil. absorb moisture of air during breathing. absorb moisture from air entering in transformer. provide cold air in transformer. filter the transformer oil. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The field divertor resistance for a DC series motor is of order of 50 Ω 10 Ω 0.1 Ω 100 Ω 50 Ω 10 Ω 0.1 Ω 100 Ω ANSWER DOWNLOAD EXAMIANS APP
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