Electrical Engineering MCQs

Page No. 282

Which of the following statement about D.C. generators is false ?


aCompensating winding in a D.C. machine helps in commutation


bIn a D. C. generator interpoles winding is connected in series with the armature winding


cBack pitch and front pitch are both odd and approximately equal to the pole pitch


dEquilizing bus bars are used with parallel running of D.C. shunt gen¬erators



To achieve sparkless commutation brushes of a D.C. generator are rockedm ahead so as to bring them?


ajust ahead of magnetic neutral axis


b in magnetic neutral axis


c just behind the magnetic neutral axis


d none



A D.C. welding generator has____________?


alap winding


bwave moving


cduplex winding


d any of the above


View Answer lap winding

In a D.C. generator the critical resistance refers to the resistance of_____________?


a brushes


b field


carmature


dload


View Answer field

The e.m.f. induced in the armature of a shunt generator is 600 V. The armature resistance is 0.1 ohm. If the armature current is 200 A, the terminal voltage will be_____________?


a640 V


b620 V


c600 V


d580 V


View Answer 580 V

In the case of lap winding resultant pitch is____________?


amultiplication of front and back pitches


bdivision of front pitch by back pitch


c sum of front and back pitches


d difference of front and back pitches



The function of pole shoes in the case of D.C. machine is______________?


a to reduce the reluctance of the mag¬netic path


bto spread out the flux to achieve uniform flux density


cto support the field coil


dto discharge all the above functions



Flashing the field of D.C. generator means:______________?


aneutralising residual magnetism


bcreating residual magnetism by a D.C. source


cmaking the magnetic losses of forces parallel


d increasing flux density by adding extra turns of windings on poles



For a D.C. machines laboratory following type of D.C. supply will be suitable___________?


a rotary converter


b mercury are rectifier


c induction motor D.C. generator set


dsynchronous motor D.C. generator set



In case of D.C. machine winding, number of commutator segments is equal to______________?


anumber of armature coils


bnumber of armature coil sides


cnumber of armature conductors


dnumber of armature turns



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