Electrical Machines For small value armature current Ia the torque developed by a DC series motor is proportional to 1/Ia. √Ia. Ia. Ia2. 1/Ia. √Ia. Ia. Ia2. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Hysteresis loss is proportional to f2. f. f3. f1.5. f2. f. f3. f1.5. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In dc machine armature windings are placed on rotor because of the necessity for commutation. electromechanical energy conversion. generation of voltage. development of torque. commutation. electromechanical energy conversion. generation of voltage. development of torque. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The armature shaft must be able to withstand any unbalanced magnetic pull on the armature core. bending moment due to weight of the armature. All of these twisting strains due to transmission of torque. any unbalanced magnetic pull on the armature core. bending moment due to weight of the armature. All of these twisting strains due to transmission of torque. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The condition for maximum running torque is unity 0.707 lagging 0.5 lagging R = S.X zero unity 0.707 lagging 0.5 lagging R = S.X zero 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 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. Would be equal to If1/2. Cannot be predicted due to insufficient data. Would be equal to If1. ANSWER DOWNLOAD EXAMIANS APP
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