A separately excited dc generator operates at a voltage V and armature current la. The armature resistance is Ra and the generator has a constant loss of P(W). For the maximum efficiency of the generator (A) la = VR. (B) la = 4R a P. (D) la = 2P (C) la = VRa 2Ra

An 6-pole d.c. generator has 515 armature conductors, and a useful flux of 10 mWb per pole. What will be the e.m.f. generated if it is lap-connected and runs at 970 rpm? What must be the speed at which it is to be driven produce the same e.m.f. if it is wave-wound? Eg Speed

A 4 pole armature of a DC machine has 175 conductors and a flux per pole of 0.1 wb. Find the EMF generated when running at 600 rpm, when the armature is Lap wound.

the armature of a 12 pole wave wound dc shunt generator has 50 slots with 12 conductors per slot. the generatoris running at a speed of 625 rpm and supplies a resistive load of 15 ohm at a terminal voltage 350v. the armature and the field reisitance are0.5 ohm and 70 ohm respectively. find the armature current,generated emf and flux per pole

A 4-pole DC generator has 800 armature conductors and a flux per pole of 10 mWb running at 600 rpm. Calculate the EMF generated when the armature is connected as a simplex lap winding.

An 6-pole d.c generator has 300 armature conductors, and a useful flux of 14 mWb per pole. What will be the em.f. generated if it is lap-connected and runs at 1420 rpm? What must be the speed at which it is to be driven produce the same e.m.f. if it is wave-wound?

The armature of a d.c. generator consists of 40 coils and each coil has 20 turns. When the armature is rotated at 200 rad/s in a 4-pole field structure having a flux of 5 mWb/pole and there are four paths in the armature, calculate (i) number of armature conductors (ii) the voltage between brushes generated by the armature.