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What is the relation of the number of slots with the leakage reactance?
c Explanation: The number of slots is indirectly proportional to the leakage reactance. The larger the number of slots, the lower will be the leakage reactance
c
See lessExplanation: The number of slots is indirectly proportional to the leakage reactance. The
larger the number of slots, the lower will be the leakage reactance
What is the range of the current density for the open type motors split phase, capacitor and repulsion start motors?
: b Explanation: The minimum value of the current density for the open type motors split phase, capacitor and repulsion start motors is 3 A per mm2 . The maximum value of the current density for the open type motors split phase, capacitor and repulsion start motors is 4 A per mm2 .
: b
See lessExplanation: The minimum value of the current density for the open type motors split
phase, capacitor and repulsion start motors is 3 A per mm2
. The maximum value of the
current density for the open type motors split phase, capacitor and repulsion start motors
is 4 A per mm2
.
How many design data are present in the design of the stator?
c Explanation: There are 8 design data available in the design of the stator. The design data are running winding, number of turns In running winding, running winding
c
See lessExplanation: There are 8 design data available in the design of the stator. The design
data are running winding, number of turns In running winding, running winding
What is the value of the stator induced voltage with respect to the supply voltage?
a Explanation: The winding factor is assumed to be 0.75-0.85 for the running winding. The stator induced voltage is 95% of the supply voltage.
a
See lessExplanation: The winding factor is assumed to be 0.75-0.85 for the running winding. The
stator induced voltage is 95% of the supply voltage.
What is the formula of the maximum flux in the running winding?
b Explanation: First the flux is calculated along with the number of poles used. On substituting the values the maximum flux value is obtained
b
See lessExplanation: First the flux is calculated along with the number of poles used. On
substituting the values the maximum flux value is obtained
What is the range of the winding factor for the usual windings distribution?
b Explanation: The minimum value of the winding factor of the usual winding distribution is 0.75. The maximum value of the winding factor of the usual winding distribution is 0.85.
b
See lessExplanation: The minimum value of the winding factor of the usual winding distribution is
0.75. The maximum value of the winding factor of the usual winding distribution is 0.85.
What is the formula for the mean pitch factor?
d Explanation: The pitch factor of each coil per pole group, turns in the coil and total number of turns are obtained. On substitution, it gives the mean pitch factor.
d
See lessExplanation: The pitch factor of each coil per pole group, turns in the coil and total
number of turns are obtained. On substitution, it gives the mean pitch factor.
How can the small single phase motor reduce the harmonics still much further?
c Explanation: 70% of the total slots are used for the reduction of the mmf wave harmonics. The mmf wave harmonics can be still further reduced by grading the winding
c
See lessExplanation: 70% of the total slots are used for the reduction of the mmf wave
harmonics. The mmf wave harmonics can be still further reduced by grading the winding
How much of the total slots are used for the reduction of the mmf wave harmonics?
c Explanation: 70% of the total slots are used for the reduction of the mmf wave harmonics. The remaining 30% are used for accommodating the starting windings.
c
See lessExplanation: 70% of the total slots are used for the reduction of the mmf wave
harmonics. The remaining 30% are used for accommodating the starting windings.
How many coils are present in the stator windings?
d Explanation: The stator windings of single phase induction motors are concentric type. There are usually 3 or more coils per pole each having same or different number of turns.
d
See lessExplanation: The stator windings of single phase induction motors are concentric type.
There are usually 3 or more coils per pole each having same or different number of
turns.