Electrical Machines A generator may loose residual magnetism due to any of these. vibrations. heating. over excitation. any of these. vibrations. heating. over excitation. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 220 V dc machine has an armature resistance of 1Ω.If the full-load current is 20 A, the differenc in the induced voltages when the machine is running as a motor and as a generator is 40 V 20 V 50 V zero 40 V 20 V 50 V zero ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 4 pole DC shunt generator having a wave winding supplies 50 lamps, each of 60 W at 120 V. The armature and field resistance are 0.2 Ω and 60 Ω respectively. The current in each armature conductor is 13.5 A. 23 A. 11.5 A. 27 A. 13.5 A. 23 A. 11.5 A. 27 A. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Autotransformer makes effective saving on copper and copper losses, when its transformation ratio is equal to less than one. greater than one. very low approx to one. less than one. greater than one. very low approx to one. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If the air gap of IM is increased, ____________ will increase. power factor. speed. air gap flux. magnetizing current. power factor. speed. air gap flux. magnetizing current. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The efficiency of a transformer is mainly dependent on core losses. stray losses. copper losses. dielectric losses. core losses. stray losses. copper losses. dielectric losses. ANSWER DOWNLOAD EXAMIANS APP
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