A. reduce the bulk
B. provide the bulk
C. insulate the core
D. reduce eddy current loss
✅ The correct answer is option D.
D.C. Generators MCQs
The field coils of D.C. generator are usually made of_____________?
A. mica
B. copper
C. cast iron
D. carbon
✅ The correct answer is option B.
The commutator segments are connected to the armature conductors by means of___________?
A. copper lugs
B. resistance wires
C. insulation pads
D. brazing
✅ The correct answer is option A.
In a commutator_____________?
A. copper is harder than mica
B. mica and copper are equally hard
C. mica is harder than copper
D. none of the above
✅ The correct answer is option C.
While applying Fleming’s right-hand rule to And the direction of induced e.m.f., the thumb points towards___________?
A. direction of induced e.m.f.
B. direction of flux
C. direction of motion of the conductor if forefinger points in the direction of generated e.m.f.
D. direction of motion of conductor, if forefinger points along the lines of flux
✅ The correct answer is option D.
The resistance of armature winding depends on
A. length of conductor
B. cross-sectional area of the conductor
C. number of conductors
D. all of the above
✅ The correct answer is option D.
Laminations of core are generally made of________________?
A. case iron
B. carbon
C. silicon steel
D. stainless steel
✅ The correct answer is option C.
A D.C. generator works on the principle of____________?
A. Lenz’s law
B. Ohm’s law
C. Faraday’s law of electromagnetic induction
D. none of the above
✅ The correct answer is option C.
Iron losses in a D.C. machine are independent of variations in_____________?
A. speed
B. load
C. voltage
D. speed and voltage
✅ The correct answer is option B.
A series generator can self-excite:______________?
A. only if the load current is zero
B. only if the load current is not zero
C. irrespective of the value of load current
D. none of the above
✅ The correct answer is option B.