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 remain the same. It will be halved. It will be doubled. It will becomes four times. It will remain the same. It will be halved. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In which of the following speed control of DC motor the speed obtained is below than the rated speed? Field resistance control. Any of above. Armature circuit resistance control. Armature voltage control. Field resistance control. Any of above. Armature circuit resistance control. Armature voltage control. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A shunt generator is running at 1000 rpm. If flux is reduced by half, then what is the new speed? 2000. 0. 500. 1000. 2000. 0. 500. 1000. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Unbalanced supply voltage given to a 3 - φ, delta connected induction motor will cause less heating of the rotor. less heating of the rotor. negative sequence current. all of these. less heating of the rotor. less heating of the rotor. negative sequence current. all of these. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If an induction machine is run at above the synchronous speed it acts as an induction generator a synchronous motor an induction motor None of these an induction generator a synchronous motor an induction motor None of these ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The rotor of a three phase induction motor has an impedance of 0.4 + j4 ohm per phase at standstill the maximum torque occurs at a slip of _____________. 50 %. 10 %. 25 %. 15 %. 50 %. 10 %. 25 %. 15 %. ANSWER DOWNLOAD EXAMIANS APP
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