Related Questions

Helical windings are used in
A distribution transformers
B power transformers
C shell type transformers
D none of the above
Two transformers are connected in parallel. These transformers do not have equal percentage impedance. This is likely to result in
A short-circuiting of the secondaries
B power factor of one of the transformers is leading while that of the other lagging
C transformers having higher copper losses will have negligible core losses
D loading of the transformers not in proportion to their kVA ratings
A practical formula for determining the thickness of insulation between low voltage and high voltage windings is
A 1 + 0.2 kV mm
B 2 + 0.5 kV mm
C 4 + 0.7 kV mm
D 5 + 0.9 kV mm
Cylindrical windings using circular conductors, employed in transformers, are
A single layered
B double layered
C multi-layered
D none of the 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
Why transformers connected in parallel should have same voltage ratio?
A To avoid full load circulating current
B To avoid no-load circulating current
C To avoid other losses
D To avoid all type of currents
The material commonly used for insulation in high voltage cables is
A Lead
B Paper
C Rubber
D None of the above
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

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