### DC Generators Objectives Part 06

**101 .** A generator may lose residual due to** heating.**

**102 . ** **Level compound generator with interpoles** is not a cross field machine.

**103 .** In case of cross field machine, the amplification ration may be of the order of **10,000.**

**104 . ** The major application of cross field machines is in **control system.**

**105 .** Compensating winding in amplidyne is provided t**o reduce magnetizing effect of armature reaction on the control winding flux.**

**106 . ** For a 6-pole wave wound dc generator the number of brushes will be** 2.**

**107 . ** Dummy coil in a dc generator is provided to** reduce mechanical unbalance.**

**108 . ** Drop in speed of a dc generator due to** increase in load can be compensated by increasing input to the prime mover.**

**109 . ** When P is the number of poles in a lap wound dc generator, the number of brushes will **be P.**

**110 .** In case of a 4-pole lap wound 32 coils dc generator the pole pitch will be** 16.**

**111 . ** Two dc shunt generators are operating in parallel. The easiest way to shift load from one generator to the other is by **adjusting field rheostats.**

**112 . ** For a generator if constant losses are equal to variable losses, the efficiency of the generator will** be maximum.**

**113 .** Electromagnetic torque and speed are in opposite directions in case of **shunt generators.**

**114 . ** The generated emf and current are in the same direction in case of** dc generators.**

**115 . ** Hysteresis losses in a dc machine are given by 𝐵1.6fV. where V stands for **volume of iron part.**