Electrical Machines In synchronous generator a synchronous dead load (lamp, furnaces etc) has no ____________ hence it has no natural frequency of oscillation. restoring torque. synchronizing power co efficient. mechanical rotatory system. damping torque. restoring torque. synchronizing power co efficient. mechanical rotatory system. damping torque. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 3-φ alternator has negligible stator resistance. A short circuit test is conducted on this alternator. At a particular speed, a field current of If1 is required to drive the rated armature current. If the speed of the alternator is reduced to half, the field current required to maintain rated armature current Would be equal to If1/2. Cannot be predicted due to insufficient data. Would be equal to If1. Woud be equal to 2If1. Would be equal to If1/2. Cannot be predicted due to insufficient data. Would be equal to If1. Woud be equal to 2If1. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The change in speed of a DC generator due to increased load is corrected by increasing terminal voltage. increasing armature cooling. increasing armature resistance. increasing input power of the prime mover. increasing terminal voltage. increasing armature cooling. increasing armature resistance. increasing input power of the prime mover. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a transformer maximum flux density is not constant, the eddy current loss varies as f V² V f² f V² V f² ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines For small value armature current Ia the torque developed by a DC series motor is proportional to 1/Ia. Ia2. √Ia. Ia. 1/Ia. Ia2. √Ia. Ia. 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 DC Shunt Motor Separately Excited DC Motor Compound Wound DC Motor DC Series Motor DC Shunt Motor Separately Excited DC Motor Compound Wound DC Motor ANSWER DOWNLOAD EXAMIANS APP
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