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 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. It will be doubled. It will becomes four times. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines An 8 pole DC generator has 500 armature conductors and useful flux per pole of 0.065 Wb. What will be the emf generated if it is lap connected and runs at 1000 rpm. What must be the speed at which it is driven to produce the same emf if it is wave wound? 541.67V, 200 rpm. 2166.67V, 270 rpm. 2166.67V, 230 rpm. 541.67V, 250 rpm. 541.67V, 200 rpm. 2166.67V, 270 rpm. 2166.67V, 230 rpm. 541.67V, 250 rpm. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The power developed by salient pole synchronous machine is/are excitation power only both 1 and 2 None of these power due to saliency or reluctance only excitation power only both 1 and 2 None of these power due to saliency or reluctance only ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The 3 - Φ induction motors are, by a very considerable margin, the most widely used AC motors as these are cheaper in cost, simple and rugged in construction. they have very good speed regulation. they have maximum efficiency and maximum starting torque. they are capable of operation under range of leading and lagging pf. these are cheaper in cost, simple and rugged in construction. they have very good speed regulation. they have maximum efficiency and maximum starting torque. they are capable of operation under range of leading and lagging pf. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following windings are necessary in case of all dc machines? lap winding wave winding open type winding closed winding lap winding wave winding open type winding closed winding ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The type of DC generator used for arc welding purpose is a shunt generator differentially compounded generator cumulatively compounded generator series generator shunt generator differentially compounded generator cumulatively compounded generator series generator ANSWER DOWNLOAD EXAMIANS APP
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