Electrical Machines In a DC generator if field winding attains the critical resistance machine will generate maximum voltage. field winding will burn. the voltage generated will be zero. machine will generate maximum power. machine will generate maximum voltage. field winding will burn. the voltage generated will be zero. machine will generate maximum power. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Consider the following statements : Interpoles in dc machines 1. reducearmature reaction effects in the interpolar region 2. have the same dimension as main polls 3. have their windings connected in series with the armature 4. have same number of turns as the armature 5. have the polarity same as that of the main pole ahead in a motor From these, the correct statements are 1, 2, 3 and 5 1, 3 and 5 1, 2 and 3 1 and 3 1, 2, 3 and 5 1, 3 and 5 1, 2 and 3 1 and 3 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Eb/Vt ratio of a DC motor is an indication of speed regulation. starting torque. efficiency. running torque. speed regulation. starting torque. efficiency. running torque. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Magnetic field of a DC generator is produced by what? Permanent magnets. Electromagnets. Both B and C. None of the options. Permanent magnets. Electromagnets. Both B and C. None of the options. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The magnetic field which initially induces emf in the armature in a self excited DC generator is because of permanent magnets. armature reaction. residual magnetism. None of these permanent magnets. armature reaction. residual magnetism. None of these ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In DC generators, electric current to the external circuit from armature is given through commutator. none of above. solid connection. slip rings. commutator. none of above. solid connection. slip rings. ANSWER DOWNLOAD EXAMIANS APP
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