Electrical Machines A dc shunt motor has external resistance Ra and Rf in the armature and field circuits respectively. Armature current at starting can be reduced by keeping Rf maximum and Ra minimum Ra minimum and Rf minimum Ra maximum and Rf maximum Ra maximum and Rf minimum Rf maximum and Ra minimum Ra minimum and Rf minimum Ra maximum and Rf maximum Ra maximum and Rf minimum ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A single phase, 2 KV alternator has an armature resistance of 0.8 ohms and 4.94 ohms respectively. The voltage regulation of the alternator at 100 a load 0.8 loading power factor is 14%. 7%. 0%. 8.9%. 14%. 7%. 0%. 8.9%. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In dc machines, the field-flux axis and armature-mmf axis are respectively along quadrature axis and direct axis direct axis and indirect axis direct axis and interpolar axis quadrature axis and interpolar axis quadrature axis and direct axis direct axis and indirect axis direct axis and interpolar axis quadrature axis and interpolar axis ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following DC motors has almost constant speed over their full load range? none of these. Series. Compound (cummolative). Shunt. none of these. Series. Compound (cummolative). Shunt. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Short circuiting is caused in the armature winding due to failure of insulation between two commutator bars. failure of insulation between two turns of coil. grounding of two or more turns of the same coil. any of above. failure of insulation between two commutator bars. failure of insulation between two turns of coil. grounding of two or more turns of the same coil. any of above. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines DC motors are stopped by opening line switches and not by forcing the handle of the motor starter back to OFF position. This is due to occurance of Both of above. Heavy sparking at the first stud of starting resistance steps. None of these. Heavy sparking at brushes. Both of above. Heavy sparking at the first stud of starting resistance steps. None of these. Heavy sparking at brushes. ANSWER DOWNLOAD EXAMIANS APP
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