Electrical Machines Commutators in DC machines have a role of which converts Both AC to DC and DC to AC. high voltage DC to low voltage DC. none of these. AC to DC. Both AC to DC and DC to AC. high voltage DC to low voltage DC. none of these. AC to DC. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Speed of DC motor can be controlled by varying resistance of armature culture. all of these. applied voltage. its flux oer pole. resistance of armature culture. all of these. applied voltage. its flux oer pole. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The no load and full load speed of DC motor are 1400 rpm and 1200 rpm respectively. What is the percentage speed regulation of the motor ? 15.30%. 18.25%. 14.28%. 16.67%. 15.30%. 18.25%. 14.28%. 16.67%. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines For a fault at the terminal of a synchronous generator, the fault current is maximum for a 3 - phase to ground fault. line to line fault. 3 - phase fault. line to ground fault. 3 - phase to ground fault. line to line fault. 3 - phase fault. line to ground fault. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following is/are the advantages of carbon brush over the copper brush? They are not hard as copper brush They are self lubricating in nature All of these In case of any sparking they will be less damaged than copper brushes They are not hard as copper brush They are self lubricating in nature All of these In case of any sparking they will be less damaged than copper brushes ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which DC motor will have least percentage increase of input current, for the same percentage increase in the torque DC Series Motor Separately Excited DC Motor Compound Wound DC Motor DC Shunt Motor DC Series Motor Separately Excited DC Motor Compound Wound DC Motor DC Shunt Motor ANSWER DOWNLOAD EXAMIANS APP
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