The length of air gap to be provided in ______ is primarily determined by power factor consideration.
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Electrical Machine Design
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Most common form of A.C. meters met with in every day domestic and industrial installations are
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Hot rolled sheets have ______ value of permeability
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An ammeter is a
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An ohmmeter is a
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In a Weston synchronoscope, the fixed coils are connected across
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The time taken by the machine to attain 0.632 of its final steady temperature rise is called
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With direct water cooling it is possible to have ratings of about
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In induction motors, the length of air gap in kept as small as mechanically possible is order to have
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Which of the following methods does not take into account the maximum temperature rise under variable loadconditions ?
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The switch board instruments
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The heat dissipating capability of transformers of ratings higher than 30 kVA in increased by providing which of the following?
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The distance between the starts of two consecutive coils measured in terms of coil sides is called
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In a 3-phase power measurement by two wattmeter method, both the watt meters had identical readings. The power factor of the load was
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E.m.f. of a Weston cell is accurately measured by
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D.C. windings are
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The design of electromagnets is based upon which of the following fundamental equations ?
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The disc of an instrument using eddy current damping should be of
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For 275 kV transformers, using cold rolled grain oriented steel, which of the following values of flux density may be used?
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________ cooling is the process of dissipating the armature and field winding losses to a cooling medium circulating within the winding insulation wall
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