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The loss for the sleeve bearing having stator outer diameter 150 mm and 1000
a Explanation: The sleeve bearing having a stator outer diameter of 150 mm has losses at different running speed. The 1000 rpm machine gives loss of 3.7 W.
a
See lessExplanation: The sleeve bearing having a stator outer diameter of 150 mm has losses at different running speed. The 1000 rpm machine gives loss of 3.7 W.
The high values actually apply for the small motors below 150 W.
b Explanation: The friction and windage loss and a speed of 1500 rpm, it is usually 4-8% of the watt output. The high values apply to small motors below 180 W.
b
See lessExplanation: The friction and windage loss and a speed of 1500 rpm, it is usually 4-8% of the watt output. The high values apply to small motors below 180 W.
What is the friction and windage loss for a 1500 rpm machine?
c Explanation: The friction and windage loss and a speed of 1500 rpm, it is usually minimum 4% of the watt output. The friction and windage loss and a speed of 1500 rpm, it is usually maximum of 8% of the watt output.
c
See lessExplanation: The friction and windage loss and a speed of 1500 rpm, it is usually
minimum 4% of the watt output. The friction and windage loss and a speed of 1500 rpm, it is usually maximum of 8% of the watt output.
What are the factors which result in the bearing friction and windage loss?
d Explanation: The bearing friction and windage loss will depend upon the ball bearings. The bearing friction and windage loss will also depend upon the sleeve bearings.
d
See lessExplanation: The bearing friction and windage loss will depend upon the ball bearings. The bearing friction and windage loss will also depend upon the sleeve bearings.
What is the range of the multiplying factor when test data is not available?
Answer: b Explanation: The multiplying factor should be obtained from tests of motors of similar design. When test data is not available, a value of 1.75 to 2 may be used.
Answer: b
See lessExplanation: The multiplying factor should be obtained from tests of motors of similar design. When test data is not available, a value of 1.75 to 2 may be used.
What is the relation between total iron loss for induction motors and the sum of stator tooth and core loss?
c Explanation: The total iron loss for induction motors is 1.5-2.5 times the sum of stator tooth and core loss. The total iron loss is due to fundamental frequency flux.
c
See lessExplanation: The total iron loss for induction motors is 1.5-2.5 times the sum of stator
tooth and core loss. The total iron loss is due to fundamental frequency flux.
What factors are considered while calculating iron loss in stator teeth and core?
d Explanation: The iron loss in stator teeth and core are found by calculating their flux densities. The iron loss in stator teeth and core are found by calculating their weights.
d
See lessExplanation: The iron loss in stator teeth and core are found by calculating their flux
densities. The iron loss in stator teeth and core are found by calculating their weights.
What is the relation between flux densities with respect to saturation factor?
d Explanation: The saturation factor is kept low if the flux densities in the teeth and coreare low. The saturation factor is kept high if the flux densities in the teeth and core are high.
d
See lessExplanation: The saturation factor is kept low if the flux densities in the teeth and coreare low. The saturation factor is kept high if the flux densities in the teeth and core are high.
What is the range of the saturation factor in the single phase induction motor?
c Explanation: The minimum value of the saturation factor in the single phase induction motor is 1.1. The maximum value of the saturation factor in the single phase induction motor is 1.35.
c
See lessExplanation: The minimum value of the saturation factor in the single phase induction motor is 1.1. The maximum value of the saturation factor in the single phase induction motor is 1.35.
What is the formula for the saturation factor?
a Explanation: The total mmf required for the magnetic circuit and the mmf required for air gap is calculated. On substitution, the saturation factor is obtained.
a
See lessExplanation: The total mmf required for the magnetic circuit and the mmf required for air gap is calculated. On substitution, the saturation factor is obtained.