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How are the radial loads caused?
c Explanation: The radial loads are caused by the dynamic unbalance of rotor. It can also be caused by the unbalanced magnetic pull of rotor.
c
See lessExplanation: The radial loads are caused by the dynamic unbalance of rotor. It can also
be caused by the unbalanced magnetic pull of rotor.
In vertical shaft machines, which load is taken up by the thrust bearings?
d Explanation: The thrust bearings are made use of for the vertical shaft machines. In vertical shaft machines, the axial load acting downwards is taken up by the thrust bearings.
d
See lessExplanation: The thrust bearings are made use of for the vertical shaft machines. In
vertical shaft machines, the axial load acting downwards is taken up by the thrust
bearings.
In horizontal shaft machines, the forces acting in which direction is prominent?
d Explanation: Plain bearings are made use of for the horizontal shaft machines. The forces acting in the radial direction are most prominent
d
See lessExplanation: Plain bearings are made use of for the horizontal shaft machines. The
forces acting in the radial direction are most prominent
What is the plain bearing used?
c Explanation: The plain bearing can be the sleeve bearings made use of. It can also be friction bearings used which is either ball or roller bearings.
c
See lessExplanation: The plain bearing can be the sleeve bearings made use of. It can also be
friction bearings used which is either ball or roller bearings.
What bearing is made use of in the horizontal shaft machines?
a Explanation: The plain bearing is made use of in the horizontal shaft machine. The thrust bearing are used for vertical shaft machine.
a
See lessExplanation: The plain bearing is made use of in the horizontal shaft machine. The thrust
bearing are used for vertical shaft machine.
What happens in the case of the small shafts?
b Explanation: The diameter of the shaft in the bearings is less than the diameter under the armature. The diameter in the bearing should be 2/3 of the maximum diameter
b
See lessExplanation: The diameter of the shaft in the bearings is less than the diameter under
the armature. The diameter in the bearing should be 2/3 of the maximum diameter
What happens when the diameter under armature is 150 mm or above?
d Explanation: The diameter of the shaft in the bearings is less than the diameter under the armature. The diameter of the shaft in bearing is 50 mm smaller than the maximum diameter.
d
See lessExplanation: The diameter of the shaft in the bearings is less than the diameter under
the armature. The diameter of the shaft in bearing is 50 mm smaller than the maximum
diameter.
What is the formula of the diameter of the shaft?
c Explanation: The output is first calculated from the operation of the machine. Next, the tachogenerator is used to calculate the speed of the machine and on the substitution of the values gives the diameter of the shaft.
c
See lessExplanation: The output is first calculated from the operation of the machine. Next, the
tachogenerator is used to calculate the speed of the machine and on the substitution of
the values gives the diameter of the shaft.
What is the second property of the shaft design?
a Explanation: The second property of the shaft design such that it should have high rigidity. The rigidity should be such that the deflection of shaft under operation of machine does not reach such a dangerous value as to cause the rotor to touch the stator.
a
See lessExplanation: The second property of the shaft design such that it should have high
rigidity. The rigidity should be such that the deflection of shaft under operation of
machine does not reach such a dangerous value as to cause the rotor to touch the
stator.
What should be the first property of the shaft design?
: b Explanation: The shaft design should be such that the shaft must have enough mechanical strength. The strength should be such that it should withstand all loads without causing much residual strain
: b
See lessExplanation: The shaft design should be such that the shaft must have enough
mechanical strength. The strength should be such that it should withstand all loads
without causing much residual strain