Related Questions

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
Even minute presence of impurities in copper impairs its electrical conductivity seriously. Electrolytic refinning of blister copper is resorted to, when
A Cheap electricity is available
B The precious metal content of copper is high
C There is a demand for ultrapure (99.99%) electrolytic copper
D All of the above
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
If 2 kg of metal, of which 1/3 is zine and the rest is copper , be mixed with 3 kg of metal, of which 1/4 is zinc and the rest is copper , then what will be the ratio of zinc to copper in the mixture?
A 17 : 43
B 13 : 42
C 19 : 43
D 15 : 42
If 2 kg of metal, of which 1/3 is zinc and the rest is copper s, be mixed with 3 kg of metal , of which 1/4 is zinc and the rest is copper , then what will be the ratio of zinc to copper in the mixture?
A 13 : 42
B 19 : 43
C 15 : 42
D 17 : 43
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
The synchronous modems are more costly than the asynchronous modems because
A they produce large volume of data
B they contain clock recovery circuits
C they transmit the data with stop and start bits.
D they operate with a larger bandwidth
E None of the above
Silicon steel is used in electrical machines because it has
A Low coercivity
B Low retentivity
C Low hysteresis loss
D High coercivity
Which of the following alloy steels has the energy saving properties making it suitable for use in electrical machines?
A Silicon steel
B Chromium steel
C Molybdenum steel
D None of these

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