Related Questions

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
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 line insulation is the insulation level of the station equipment.
A less than
B same as
C more than
D proportional to
E not directly related with
Upto the critical radius of insulation, added insulation, will
A Increase the heat loss
B Decrease heat loss and will have no effect beyond that
C Decrease heat flux
D Reduce convection heat loss compared to conduction heat less
A ferrite core has less eddy current loss than an iron core because
A Ferrites have high resistance
B Ferrites are magnetic
C Ferrites have low permeability
D Ferrites have high hysteresis
দুটি সুসঙ্গত উৎস থেকে λ দৈর্ঘ্যের দুটি তরঙ্গ সমদশায় বের হয় । একটি বিন্দুতে যেখানে তরঙ্গ দুটি মিলিত হয় সেখানে তাদের দশা পার্থক্য 90° । তরঙ্গ দুটির অতিক্রান্ত পথ পার্থক্য তখন কত ? ( Two coherent sources emit waves of wavelength λ which are in phase. which are in phase. The two waves meet at a point where they have a phase difference of 90°. Which of the following could be the traversed path difference between the waves?)
A 2λ
B λ
C λ/2
D λ/4
Two waves of the same frequency have opposite phase when the phase angle between them is
A 360°
B 180°
C 90°
D 0°
In AC.S.R. Conductors, the insulation between aluminium and steel conductors is
A Insulin
B Bitumen
C Varnish
D No insulation is required
The weight of copper of both armature and field windings decreases with _____ in number of poles.
A increase
B decrease
C either of the above
D none of the above
By which of the following methods the temperature rise of windings and other parts may be determined ?
A Thermometer method
B Resistance method
C Embedded temperature detector method
D Any of the above

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