Top 250+ Solved Electrical and Electronics Engineering MCQ Questions Answer
Q. The Ta/Ia graph of a dc series motor is a
a. parabola from no load to overload
b. straight line throughout
c. parabola throughout
d. parabola upto full load and a straight line at overloads
Q. When load is removed, .......motor will run at the highest speed.
a. shunt
b. cumulative - compound
c. differential compound
d. series
Q. In Fleming's right-hand rule, the thumb point towards
a. direction of flux
b. direction of induced e.m.f.
c. direction of motion of conductor, if fore finger points along the lines of flux
d. direction of motion of the conductor\ if fore finger point in the direction of generated e.m.f.
Q. . The armature of a dc machine is made of____.
a. silicon steel
b. wrought iron
c. cast steel
d. soft iron
Q. The yoke of a d.c. machine is made of ____.
a. silicon steel
b. soft iron
c. aluminum
d. cast steel
Q. . The coupling field electrical and mechanical systems of dc machine is____.
a. electric field
b. magnetic field
c. both electric and magnetic fields
d. mechanical field
Q. The real working part of a dc machine is the ___.
a. commutator
b. field winding
c. armature winding
d. none of the above
Q. The armature winding of a dc machine is place on rotor to_____.
a. save iron
b. reduce losses
c. improve commutation
d. reduce armature reaction
Q. The yoke of a dc machine carries ____pole flux.
a. the
b. one-half of
c. two times the
d. none of the above
Q. The field structure of a dc machine uses ____.
a. salient pole arrangement
b. non-salient pole arrangement
c. both a and b
d. none of the above
Q. ____ together are called stray losses
a. copper and iron losses
b. iron and mechnical losses
c. field copper and iron losses
d. frictional and copper losses
Q. The armature conductors of 6 pole, lap wound D.C. generator are divided into
a. 2 parallel paths
b. 4 parallel paths
c. 3 parallel paths
d. 6 parallel paths
Q. The commutator of D.C. geenrator acts as ___
a. an amplifier
b. a rectifier
c. a load
d. none of the above