Electrical Engineering MCQs

Page No. 285

The resistance of armature winding depends on


alength of conductor


b cross-sectional area of the conductor


cnumber of conductors


dall of the above


View Answer all of the above

The field coils of D.C. generator are usually made of_____________?


a mica


b copper


c cast iron


d carbon


View Answer copper

In a commutator_____________?


a copper is harder than mica


bmica and copper are equally hard


cmica is harder than copper


d none of the above



According to Fleming’s right-hand rule for finding the direction of induced e.m.f., when middle finger points in the direction of induced e.m.f., forefinger will point in the direction of____________?


amotion of conductor


b lines of force


ceither of the above


dnone of the above


View Answer lines of force

While applying Fleming’s right-hand rule to And the direction of induced e.m.f., the thumb points towards___________?


adirection of induced e.m.f.


bdirection of flux


cdirection of motion of the conductor if forefinger points in the direction of generated e.m.f


ddirection of motion of conductor, if forefinger points along the lines of flux



In D.C. generators the pole shoes are fastened to the pole core by_____________?


arivets


bcounter sunk screws


cbrazing


d welding


View Answer counter sunk screws

Fleming’s right-hand rule regarding direction of induced e.m.f., correlates__________?


a magnetic flux, direction of current flow and resultant force


bmagnetic flux, direction of motion and the direction of e.m.f. induced


cmagnetic field strength, induced voltage and current


d magnetic flux, direction of force and direction of motion of conductor



In case of D.C. machines, mechanical losses are primary function of____________?


acurrent


b voltage


c speed


dnone of above


View Answer speed

Copper brushes in D.C. machine are used_____________?


a where low voltage and high currents are involved


b. where high voltage and small cur-rents are involved


c in both of the above cases


d in none of the above cases



For a D.C. generator when the number of poles and the number of armature conductors is fixed, then which winding will give the higher e.m.f___________ ?


aLap winding


bWave winding


cEither of A. and B. above


dDepends on other features of design


View Answer Wave winding

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