Electrical Machines A 4-pole DC generator runs at 1500 rpm. The frequency of current in the armature winding is: 25 Hz. Zero Hz. 100 Hz. 50 Hz. 25 Hz. Zero Hz. 100 Hz. 50 Hz. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The low voltage winding of a 400/230 V single phase 50 Hz transformer is to be connected to keep the magnetization current at the same level in both the cases the voltage at 25 Hz should be 65 V 230 V 460 V 115 V 65 V 230 V 460 V 115 V ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A transformer core is made up of a silicon steel laminations which has maximum flux density 1 Tesla. If it was cold rolled grain oriented its flux density increases to 1.6 Tesla. What is the saving in core size or area due to cold rolled grain oriented process? 60% 38% 40% 68% 60% 38% 40% 68% ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines What type of connection is made in between the inter-pole and the field winding? Parallel. Series. None of the options. Compound. Parallel. Series. None of the options. Compound. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In synchronous generator a synchronous dead load (lamp, furnaces etc) has no ____________ hence it has no natural frequency of oscillation. mechanical rotatory system. restoring torque. damping torque. synchronizing power co efficient. mechanical rotatory system. restoring torque. damping torque. synchronizing power co efficient. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines For a DC machine having P no of pair of pole pairs, Z no of conductors having length L of resistivity ρ and cross section S are arranged. what is the armature resistance? PZL/ 4Sa PZL/4Sp² PZL/4Sa² PZL/4S PZL/ 4Sa PZL/4Sp² PZL/4Sa² PZL/4S ANSWER DOWNLOAD EXAMIANS APP
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