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 s2. sf / 2. f / s. sf. s2. sf / 2. f / s. sf. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The demagnetising component of armature reaction in a DC generator reduces generator emf. increases armature speed. results in sparking trouble. reduces inter poles flux density. reduces generator emf. increases armature speed. results in sparking trouble. reduces inter poles flux density. 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 Two transformers operating in parallel will share the load depending on their efficiency ratings per unit impedance leakage reactance efficiency ratings per unit impedance leakage reactance ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Neglecting all losses, the developed torque (T) of DC separately excited motor, operating under constant terminal voltage is reduced to its output power (P) as T ∝ √P. T ∝ P. T2 ∝ P3. T is independent of P. T ∝ √P. T ∝ P. T2 ∝ P3. T is independent of P. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If the mechanical angle α between the stator and rotor poles increases, then the stator current None of above. Increases. Decreases. Remains unchanged. None of above. Increases. Decreases. Remains unchanged. ANSWER DOWNLOAD EXAMIANS APP
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