Electrical Machines In case of a dc motor the ratio Eb / E is indicative of efficiency. ratio of input to output voltage. ratio of starting to running torque. ratio of starting to running current. efficiency. ratio of input to output voltage. ratio of starting to running torque. ratio of starting to running current. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In dc machines, the armature windings are placed on the rotor because of the necessity for commutation generation of voltage electromechanical energy conversion development of torque commutation generation of voltage electromechanical energy conversion development of torque ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A DC shunt generator builds up to a voltage of 220 V at no load while running at its rated speed. If the speed of the generator is raised by 25% kepping the circuit conditions unaltered, then the Voltage to which the machine would build up will not change and remain at 220 V increase to 1.25 times 220 V increase to value lying between 220 V and 1.25 times 220 V increase to a value greater than 1.25 times 220 V not change and remain at 220 V increase to 1.25 times 220 V increase to value lying between 220 V and 1.25 times 220 V increase to a value greater than 1.25 times 220 V ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The direction of rotation of a 3 - Φ induction motor can be reversed by transposing any two leads from slip rings. transposing any two leads from supply. transposing all the three leads from the supply. disconnecting any one phase. transposing any two leads from slip rings. transposing any two leads from supply. transposing all the three leads from the supply. disconnecting any one phase. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In which of the following, voltage regulation may be zero or negative unity power factor All of these leading power factor lagging power factor unity power factor All of these leading power factor lagging power factor ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a DC generator sparking between brushes and commutator surface may be due to too rapid reversal of current. any of the above. under commutation. over commutation. too rapid reversal of current. any of the above. under commutation. over commutation. ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS