D.C. machines designed with a large value of air gap length have
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Electrical Engineering · all questionsElectrical Machine Design
Electrical Machine Design
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_________ electromagnets generally function as holding magnets.
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By which of the following methods motor rating for variable load drives can be determined ?
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In direct cooled system using hydrogen both stator and rotor conductors are made
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On which of the following variables heat convected depends ?
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An instrument transformer is used to extend the range of
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The value of exciting or magnetizing current depends upon which of the following factors ?
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The voltage control in electric supply networks in required on account of which of the following reasons ?
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The function of shunt in an ammeter is to
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A phase shifting transformer is used in conjunction with
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The weight of copper of both armature and field windings decreases with _____ in number of poles.
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Which of the following instruments indicate the instantaneous value of the electrical quantity being measured at the time at which it is being measured ?
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In Weston synchronoscope the moving coil is connected across
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The winding where dummy coils are used is sometimes called
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By which of the following methods the temperature rise of windings and other parts may be determined ?
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In a dynamometer 3-phase power factor meter, the planes of the two moving coils are at
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With conventional hydrogen cooling it is possible to increase the rating of a single unit to
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Which of the following is the commonly used type of electromagnets ?
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The noise produced by a ______ cooled machine is less as the rotor moves in a medium of smaller density.
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If the current in a capacitor leads the voltage by 80°, the loss angle of the capacitor is
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