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What happens in the shaded pole starting method according to the displacement?
c Explanation: The shaded pole starting method is that the part of the pole is shaded by short circuited copper ring. The displacement between shaded and unshaded portion varies between 200-300.
c
See lessExplanation: The shaded pole starting method is that the part of the pole is shaded by
short circuited copper ring. The displacement between shaded and unshaded portion
varies between 200-300.
What is the shaded pole starting method?
b Explanation: One of the starting methods of the single phase induction motor is the shaded pole starting method. Here the part of the pole is shaded by the short circuited copper ring
b
See lessExplanation: One of the starting methods of the single phase induction motor is the
shaded pole starting method. Here the part of the pole is shaded by the short circuited
copper ring
When is the starting winding cut out of the circuit in the split phase motor?
b Explanation: The single phase induction motor is not a self starting machine and hence starting windings are connected in series with the running winding. The starting windings are cut out when the motor speed reaches 75 % of the full load speed
b
See lessExplanation: The single phase induction motor is not a self starting machine and hence
starting windings are connected in series with the running winding. The starting windings
are cut out when the motor speed reaches 75 % of the full load speed
How is the required phase displacement between the current in the running and starting windings obtained?
d Explanation: The running winding displaces the starting winding by 90°. The required phase displacement is obtained by connecting a suitable impedance in series with any of the windings.
d
See lessExplanation: The running winding displaces the starting winding by 90°. The required
phase displacement is obtained by connecting a suitable impedance in series with any
of the windings.
What is the displacement of the running and the starting windings used?
: b Explanation: The split phase starting makes use of the starting windings along with the running windings. The running winding displaces the starting windings by 900.
: b
See lessExplanation: The split phase starting makes use of the starting windings along with the
running windings. The running winding displaces the starting windings by 900.
What are the names of the windings used in the split phase starting?
c Explanation: The single phase induction motor is not self starting. The starting or auxiliary windings are used along with the running or main windings.
c
See lessExplanation: The single phase induction motor is not self starting. The starting or
auxiliary windings are used along with the running or main windings.
How many methods are present in the self starting of the single phase induction motor?
c Explanation: There are 3 methods involved in the self starting of the single phase induction motor. They are split phase starting, shaded pole starting, repulsion motor starting
c
See lessExplanation: There are 3 methods involved in the self starting of the single phase
induction motor. They are split phase starting, shaded pole starting, repulsion motor
starting
What is the special feature of single phase induction motor?
d Explanation: The single phase induction motor has no inherent starting torque. Thus special means should be used to make it self starting
d
See lessExplanation: The single phase induction motor has no inherent starting torque. Thus
special means should be used to make it self starting
What is the formula for the maximum air passing per second at maximum efficiency?
a Explanation: The volume of air passing per second is first calculated and multiplying it by 2 gives the maximum air passing per second. The maximum air passing per second is used in the calculation of the area of the outlet opening
a
See lessExplanation: The volume of air passing per second is first calculated and multiplying it by
2 gives the maximum air passing per second. The maximum air passing per second is
used in the calculation of the area of the outlet opening
What is the formula for the number of blades?
c Explanation: The outside diameter and the width of fan is first calculated. Then the range is fixed according to the diameter and on substitution gives the number of blades.
c
See lessExplanation: The outside diameter and the width of fan is first calculated. Then the range
is fixed according to the diameter and on substitution gives the number of blades.