A. Closed windings
B. Open windings
C. Either of the above
D. None of the above
Related Mcqs:
- ____________are used for construction of core of electromagnets?
A. Soft magnetic materials
B. Hard magnetic materials
C. Either A. or B.
D. None of the above - For large power transformers, self oil cooled type or air blast type which of the following values of current density may be used?
A. 1.0 to 1.2 A/mm2
B. 1.5 to 2.0 A/mm2
C. 2.2 to 3.2 A/mm2
D. 3.2 to 4.2 A/mm2 - Multi-layer helical windings are commonly used in the transformers as high voltage windings_______________?
A. upto 20 kV
B. upto 50 kV
C. upto 80 kV
D. for 110 kV and above - Which of the following is the commonly used type of electromagnets ?
A. Flat-faced armature type
B. Horse shoe type
C. Flat-faced plunger type
D. All of the above - The high voltage winding is usually which of the following type ?
A. Cylindrical winding with circular conductors
B. Cross-over winding with either circular or small rectangular conductors
C. Continuous disc type winding with rectangular conductors
D. All of the above types - Which of the following is the major consideration to evolve a good design ?
A. Cost
B. Durability
C. Compliance with performance criteria as laid down in specifications
D. All of the above - The heated parts of an electrical machine dissipate heat into their surroundings by which of the following modes of heat dissipation ?
A. Conduction
B. Convection
C. Radiation
D. All of the above - In direct cooled system using hydrogen both stator and rotor conductors are made____________?
A. solid
B. hollow
C. perforated
D. any ofthe above - The distance between the starts of two consecutive coils measured in terms of coil sides is called_____________?
A. front pitch
B. winding pitch
C. commutator pitch
D. back pitch - The operation of a D.C. machine with large air gap lengths is comparatively_____________?
A. quiet
B. noisy
C. either of the above
D. none of the above
