Electrical Machines In a loaded DC motor, if the brushes are given a shift from the interpolar axis in the direction of rotation, then the commutation will deteriorate and the speed rises. improve and the speed falls. deteriorate and the speed falls. improve and the speed rises. deteriorate and the speed rises. improve and the speed falls. deteriorate and the speed falls. improve and the speed rises. 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 residual magnetism. permanent magnets. None of these armature reaction. residual magnetism. permanent magnets. None of these armature reaction. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If s is the slip and f is the supply frequency of an induction motor, the frequency of rotor current is given by f / s. s2. sf / 2. sf. f / s. s2. sf / 2. sf. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which machine is used for battery charging? Compounded DC generator. DC shunt generator. None of these. DC series generator. Compounded DC generator. DC shunt generator. None of these. DC series generator. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The armature resistance of the dc motor is generally of the range 100 ohm. 0.1 ohm. 0.5 ohm. 50 ohm. 100 ohm. 0.1 ohm. 0.5 ohm. 50 ohm. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If the mechanical angle α between the stator and rotor poles increases, then the stator current Increases. None of above. Remains unchanged. Decreases. Increases. None of above. Remains unchanged. Decreases. ANSWER DOWNLOAD EXAMIANS APP
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