Electrical Machines In DC machines internal characteristics are plotted between Vt vs load current Eg vs Ia Vt vs Ia Eg vs load current Vt vs load current Eg vs Ia Vt vs Ia Eg vs load current ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If the load current and flux of a DC motor are held constant and voltage applied across it armature is increased by 5%, the speed of the motor will Remain unchanged. Reduce by 5%. Depends on other factor. Increase by 5%. Remain unchanged. Reduce by 5%. Depends on other factor. Increase by 5%. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If starting current of a 3 - Φ induction motor is 5 times the rated current, while rated slip is 4 %, then ratio of starting torque to full load torque is 0.8. 0.4. 1. 0.6. 0.8. 0.4. 1. 0.6. 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 None of these residual magnetism. permanent magnets. armature reaction. None of these residual magnetism. permanent magnets. armature reaction. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Generator works on the principle of production None of these static induced emf. dynamically induced emf. both A and B. None of these static induced emf. dynamically induced emf. both A and B. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The introduction of interpoles in between the main poles improves the performance of a dc machine, because a counter-emf is induced in the coil undergoing commutation the flux waveform is improved with reduction in harmonics the interpoles produce additional flux to augment the developed torque the inequality of air-gap flux on the top and bottom halves of the armature is removed a counter-emf is induced in the coil undergoing commutation the flux waveform is improved with reduction in harmonics the interpoles produce additional flux to augment the developed torque the inequality of air-gap flux on the top and bottom halves of the armature is removed ANSWER DOWNLOAD EXAMIANS APP
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