Types of DC Machines Starter Quiz

In DC machine, the commutator is made of-

The wave winding in DC machine is designed for-

The generated emf in armature coil of a DC machine.

A 8 pole generator with 64 coil has a two layer LAP winding. The pole pitch is-

The flux density in the pole of a DC generator is 0.5 T and area 80 cm². The leakage coefficient is 1.3. If there are 800 conductors in the lap wounded armature, calculate the emf generated when generator is rotating at a speed of 1200 rpm, ____________ in volts.

For a Shunt DC machine, consider supply voltage as 240 V, armature resistance to be 0.15 Ω and field resistance is 120 Ω.If line current when machine runs as a generator and as motor is 75A in each case. Then ratio of speed of machine as a generator to speed of machine as a motor is _______