Electrical Machines Objective Questions
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In Dc generators, electric current to the external circuit from armature is given through
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Poles of DC machine are often laminated to
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In DC generators, the brushes remain in contact with conductors which
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If field current is decreased in shunt dc motor, the speed of the motor
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The ventilating ducts in most of DC machine are
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Armature of DC machine is made of
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The emf induced in a conductor rotating in a bipolar field is
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07․ The polarity of a DC generator can be reversed by
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Lamination of core are generally made of
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What are slot wedges in a DC machine made of?
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The purpose of providing dummy coils in a generator is
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The number of brushes in a commutator depends on
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If B is flux density, l the length of the conductor and v the velocity of the conductor, then emf is given by
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The armature of DC generator is laminated to
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In a DC generator if field winding attains the critical resistance
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The brushes of a DC machine should be placed on the
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Copper brushes in DC machine are used
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The resistance of armature winding depends on
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The armature of DC machine is made of silicon steel lamination to
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The insulating material used between the commutator segments is normally
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In an ideal DC generator the regulation is
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In Dc machine, the armature windings are placed on the rotor because of necessity for
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Width of a carbon brush should be equal to
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A DC generator beyond critical resistance will generate
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In a DC machine
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The teeth in the armature of a DC machines are sometimes skewed. This is done to reduce
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When Flemings right hand rule to find the direction of induced emf, the thumb points towards
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The bearings used to support the rotor shafts are generally
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In a DC generator, if P be the number of poles and N be the rpm of the rotor, then frequency of magnetic reversals will be
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In a commutator
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Electrical Machines - 18
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