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What is the range of the width of each band that should not be exceeded?
b Explanation: Bands placed along the active length of windings are housed in the ring slots. The width of each band should not exceed 15 to 20 mm.
b
See lessExplanation: Bands placed along the active length of windings are housed in the ring
slots. The width of each band should not exceed 15 to 20 mm.
What are the factors on which the sizes of bands placed on depend?
c Explanation: The sizes of bands placed on the active portions of the conductors depend upon the length of air gap. They also depend upon the method of cooling of armatures.
c
See lessExplanation: The sizes of bands placed on the active portions of the conductors depend
upon the length of air gap. They also depend upon the method of cooling of armatures.
What is the use of the wire bands of rotor?
a Explanation: Bands used on the rotors of electrical machines are intended for bracing the rotor windings. This is done against their shift in the radial direction under action of centrifugal forces.
a
See lessExplanation: Bands used on the rotors of electrical machines are intended for bracing
the rotor windings. This is done against their shift in the radial direction under action of
centrifugal forces.
What is the formula of the centrifugal force?
a Explanation: The weight of revolving body, speed, radius of circular path is calculated. On substitution the centrifugal force is obtained.
a
See lessExplanation: The weight of revolving body, speed, radius of circular path is calculated.
On substitution the centrifugal force is obtained.
What is the formula for the radius at the centre of gravity?
c Explanation: The outer diameter of stator core is first calculated. On substituting the values the radius at the centre of gravity is obtained.
c
See lessExplanation: The outer diameter of stator core is first calculated. On substituting the
values the radius at the centre of gravity is obtained.
What is the formula for the checking of rigidity of induction machines?
d) moment of inertia ≤ radius / length of stator core * 90
d) moment of inertia ≤ radius / length of stator core * 90
See lessWhat is the formula for the breadth of the ac machine?
a Explanation: The breadth of the ac machines also depends upon the inner diameter of the frame. On substituting the values the breadth is calculated.
a
See lessExplanation: The breadth of the ac machines also depends upon the inner diameter of
the frame. On substituting the values the breadth is calculated.
What is the formula for the thickness of the ac machines?
a Explanation: The thickness of the ac machines depend upon the inner diameter of the frame. On obtaining the inner diameter of frame and on substitution gives the thickness of ac machines
a
See lessExplanation: The thickness of the ac machines depend upon the inner diameter of the
frame. On obtaining the inner diameter of frame and on substitution gives the thickness
of ac machines
What is the formula in order to check the rigidity?
a Explanation: The moment of inertia, the weight of magnetic frame and the radius is calculated first. The machine is highly rigid if the moment of inertia is greater than or equal to the product of weight of magnetic frame and square of radius divided by 225
a
See lessExplanation: The moment of inertia, the weight of magnetic frame and the radius is
calculated first. The machine is highly rigid if the moment of inertia is greater than or
equal to the product of weight of magnetic frame and square of radius divided by 225
What is the formula for the depth of the yoke?
b Explanation: The depth of yoke is equal to the thickness of the yoke. It is calculated to give the required cross-section for the magnetic circuit
b
See lessExplanation: The depth of yoke is equal to the thickness of the yoke. It is calculated to
give the required cross-section for the magnetic circuit