Electrical Machines In a step down transformer which one of the following statements is true? Secondary power is less than primary power. Secondary current is less than primary current. Number of secondary turns is less than primary turns. Number of secondary turns is more than that of primary. Secondary power is less than primary power. Secondary current is less than primary current. Number of secondary turns is less than primary turns. Number of secondary turns is more than that of primary. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A DC shunt machine generates 250 V on open circuit at 1000 RPM. Armature resistance is 0.5 Ω, field resistance 250 Ω. When running as a motor takes 4 A at 250 V. Calculate the efficiency when running as a motor taking 40 A at 250 V. Armature reaction weakens the field by 4%. 78.5% 67.5% 72.5% 82.5% 78.5% 67.5% 72.5% 82.5% ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Eddy current loss will depends on Flux density Thickness All of these Frequency Flux density Thickness All of these Frequency ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If the armature electric current is increased to double its previous value, and the time of commutation is halved, how will the reactance voltage vary? It will be doubled. It will remain the same. It will be halved. It will becomes four times. It will be doubled. It will remain the same. It will be halved. It will becomes four times. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Two transformers with identical rating, are designed with flux densities of 1.2 and 1.4 Wb / m2 respectively. The weight of first transformer per kVA is less than that of second transformer. more than that of second transformer. equal to that of second transformer. none of these. less than that of second transformer. more than that of second transformer. equal to that of second transformer. none of these. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following DC motors has got maximum relieving property? Cummulative compound. Differentical compound. Series. Shunt. Cummulative compound. Differentical compound. Series. Shunt. ANSWER DOWNLOAD EXAMIANS APP
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