Electrical Machines In a DC generator the emf generated by the armature is maximum when induced voltage is high. shaft rotation is high. rate of change of flux is minimum. rate of change of flux is maximum. induced voltage is high. shaft rotation is high. rate of change of flux is minimum. rate of change of flux is maximum. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Consider the following statements regarding the magnetization characteristics of a dc generator : 1. It represents the variation of field flux with field current. 2. Variation of open-circuit terminal voltage with field current is independent of speed 3. It is non-linear from zero to rated field current 4. It helps to determine the critical field resistance at a given speed 5. It always starts from the origin Which of these statements are correct ? 1, 2 and 5 1 and 4 3 and 5 2, 3 and 4 1, 2 and 5 1 and 4 3 and 5 2, 3 and 4 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines What is/are the necessary conditions for parallel operation of alternators? Both 1and 2 Frequency should be same Terminal voltage is same Speed of alternators should be same Both 1and 2 Frequency should be same Terminal voltage is same Speed of alternators should be same ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Diverters are used only in shunt motors series motors either of these None of these shunt motors series motors either of these None of these ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The factors that are responsible for decrease in terminal voltage of a shunt generator are reduction in field current, effect of armature reaction, armature. armature resistance, effect of armature reaction. armature resistance, inter poles, armature. armature resistance, effect of armature reaction. reduction in field current, effect of armature reaction, armature. armature resistance, effect of armature reaction. armature resistance, inter poles, armature. armature resistance, effect of armature reaction. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In DC machine yoke offers both A and B flux path completion produce working flux mechanical protection to the machine both A and B flux path completion produce working flux mechanical protection to the machine ANSWER DOWNLOAD EXAMIANS APP
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