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What is the formula for the total head produced?
c Explanation: The various coefficient of hydrodynamic resistance is calculated along with the volume of air passing per second. On substituting the various values and on addition gives the total head produced.
c
See lessExplanation: The various coefficient of hydrodynamic resistance is calculated along with
the volume of air passing per second. On substituting the various values and on addition
gives the total head produced.
What is the formula for the fundamental relationship for the design of the ventilation system?
a Explanation: First the hydrodynamic resistance is calculated along with the volume of air passing. On substitution in the formula gives the head of air inside the machine
a
See lessExplanation: First the hydrodynamic resistance is calculated along with the volume of air
passing. On substitution in the formula gives the head of air inside the machine
What is the value of permissible stress for steel wire for the diameter of branding wire of 0.5-1.2 mm?
b Explanation: The value of permissible stress for steel wire for the diameter of branding wire of 0.5-1.2 mm is 600 NM per m2 . The value of permissible stress for steel wire for the diameter of branding wire of 1.5-2 mm is 570 NM per m2
b
See lessExplanation: The value of permissible stress for steel wire for the diameter of branding
wire of 0.5-1.2 mm is 600 NM per m2
. The value of permissible stress for steel wire for
the diameter of branding wire of 1.5-2 mm is 570 NM per m2
What is the value of permissible stress for bronze wire for the diameter of branding wire of 1 mm?
a Explanation: The permissible stress for bronze wire for the diameter of branding wire of 1 mm is 350 NM per m2 . The permissible stress for bronze wire for the diameter of branding wire of 1.5 mm is 300 NM per m2 .
a
See lessExplanation: The permissible stress for bronze wire for the diameter of branding wire of
1 mm is 350 NM per m2
. The permissible stress for bronze wire for the diameter of
branding wire of 1.5 mm is 300 NM per m2
.
What is the formula of the mean diameter at the position of centre of gravity?
d Explanation: The inner diameter and the diameter of the stator wires is first calculated. Then on substitution gives the mean diameter at the position of centre of gravity
d
See lessExplanation: The inner diameter and the diameter of the stator wires is first calculated.
Then on substitution gives the mean diameter at the position of centre of gravity
What is the function of the bands when they are distributed along the axial length of armature?
d Explanation: The bands are distributed along the axial length of the armature and they withstand the centrifugal forces. The centrifugal forces are due to the weight of both the active and inactive parts of armature
d
See lessExplanation: The bands are distributed along the axial length of the armature and they
withstand the centrifugal forces. The centrifugal forces are due to the weight of both the
active and inactive parts of armature
What is the function of the bands when it is placed on overhang?
: d Explanation: The bands when placed on overhead only are used to withstand the centrifugal forces. The centrifugal forces are due to the weight of the overhang
: d
See lessExplanation: The bands when placed on overhead only are used to withstand the
centrifugal forces. The centrifugal forces are due to the weight of the overhang
What is the maximum width of the bands placed on the end windings of induction machines and high speed dc machines?
c Explanation: The maximum width are obtained for the bands placed on the end windings of induction machines and high speed dc machines. The maximum width is 40 mm.
c
See lessExplanation: The maximum width are obtained for the bands placed on the end windings
of induction machines and high speed dc machines. The maximum width is 40 mm.
What is the value of the constant used in the calculation of the breadth of the ring slot for the diameter of band wire < 1.5 mm?
a Explanation: The value of the constant used in the calculation of the breadth of the ring slot is 1 mm for the diameter of band wire < 1.5 mm. The value of the constant used in the calculation of the breadth of the ring slot is 1.5 mm for the diameter of band wire > 1.5 mm
a
See lessExplanation: The value of the constant used in the calculation of the breadth of the ring
slot is 1 mm for the diameter of band wire < 1.5 mm. The value of the constant used in
the calculation of the breadth of the ring slot is 1.5 mm for the diameter of band wire >
1.5 mm
What is the maximum value above which the total width of the bands should not exceed?
a Explanation: The total width should not exceed 25% of the axial length of the armature core. The total width should not exceed maximum of 35% of the axial length of the armature core.
a
See lessExplanation: The total width should not exceed 25% of the axial length of the armature
core. The total width should not exceed maximum of 35% of the axial length of the
armature core.