Related Questions

Multilayer 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
The insulation between windings and grounded core and the insulation between the windings of the same phase is
A minor insulation
B major insulation
C either of the above
D none of the above
Compensating windings are used in D.C. generators
A Mainly to reduce the eddy currents by providing local short-circuits
B To provide path for the circulation of cooling air
C To neutralize the cross-magnetizing effect of the armature reaction
D None of the above
The cylindrical windings using circular conductors are used for current rating of
A upto 20 A
B upto 40 A
C upto 60 A
D upto 80 A
Disc windings are primarily used in
A short capacity transformers
B medium capacity transformers
C high capacity transformers
D any of the above
Is universally used for windings of electrical machines because it is easily workable without any possibility of
A fracture
B Silver
C Steel
D Aluminium
E Copper
A helical antenna is used for satellite tracking because of
A Circular polarization
B Maneuverability
C Beamwidth
D Gain
The cracks in helical springs used in railway carriages usually start on the inner side of the coil because of the fact that
A It is subjected to a higher cyclic loading than the outer side
B It is subjected to a higher stress than the outer side
C It is more stretched than the outer side during the manufacturing process
D It has a lower curvature than the outer side
Helical coils can be used on
A low voltage side of high kVA transformers
B high frequency transformers
C high voltage side of small capacity transformers
D high voltage side of high kVA rating transformers
In the calculation of induced shear stress in helical springs, the Wahl's stress factor is used to take care of
A Combined effect of transverse shear stress and bending stress in the wire
B Combined effect of bending stress and curvature of the wire
C Combined effect of transverse shear stress and curvature of wire
D Combined effect of torsional shear stress and transverse shear stress in the wire

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