Electrical Machines The residual magnetism of a self-excited dc generator is lost. To build up its emf again the field winding connection must be reversed the armature connection must be reversed field winding must be excited by low voltage dc supply the field winding must be replaced the field winding connection must be reversed the armature connection must be reversed field winding must be excited by low voltage dc supply the field winding must be replaced ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines For a DC Motor for constant load torque, what will happen to the armature current if armature resistance increases? None of above. Remain unchanged Decreases. Increases. None of above. Remain unchanged Decreases. Increases. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Number of slip rings in 3-phase synchronous motor will be 1 0 2 3 or 4 1 0 2 3 or 4 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A dc shunt generator, when commissioned after a major repair of the field system, failed to build Up voltage. It was because there was a break in the armature circuit field winding was wrongly connected field resistance was higher than critical resistance field system lost residual magnetism there was a break in the armature circuit field winding was wrongly connected field resistance was higher than critical resistance field system lost residual magnetism ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines When applied rated voltage per phase is reduce to one half, the starting torque of three phase squirrel cage induction motor becomes 1/4 of the intial value 1/2 of the initial value 4 time the initial value twice the initial value 1/4 of the intial value 1/2 of the initial value 4 time the initial value twice the initial value ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Induction motor operation depends on either of these. None of these stationary magnetic field. rotating magnetic field. either of these. None of these stationary magnetic field. rotating magnetic field. ANSWER DOWNLOAD EXAMIANS APP
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