Electrical Machines For 250 volt DC Shunt Motor the armature and field resistance are 0.5 ohm and 250 ohm respectively. What will be the back e.m.f. produced when it takes a load current of 21A. 150 V. 240 V. 280 V. 220 V. 150 V. 240 V. 280 V. 220 V. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In shunt dc motor the direction of rotation of the motor will reversed. When only field terminals are changed. only armature terminals are reversed. either field terminals are reversed or armature terminals are reversed. none of above. only field terminals are changed. only armature terminals are reversed. either field terminals are reversed or armature terminals are reversed. none of above. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If the excitation is critical, the power factor of the alternator is lagging power factor. unity power factor. leading power factor. None of these lagging power factor. unity power factor. leading power factor. None of these ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If the armature electric current is increased to double its previous value, and the time of commutation is halved, how will the reactance voltage vary? It will be doubled. It will becomes four times. It will be halved. It will remain the same. It will be doubled. It will becomes four times. It will be halved. It will remain the same. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines When maximum flux density is constant, the eddy current losses are proportional to V2 V f f2 V2 V f f2 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a step down transformer which one of the following statements is true? Number of secondary turns is less than primary turns. Secondary power is less than primary power. Secondary current is less than primary current. Number of secondary turns is more than that of primary. Number of secondary turns is less than primary turns. Secondary power is less than primary power. Secondary current is less than primary current. Number of secondary turns is more than that of primary. ANSWER DOWNLOAD EXAMIANS APP
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