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.What is the formula for the mmf required for air gap?
b Explanation: The air gap flux density, air gap constant, air gap length are calculated first. On substitution, the mmf required for air gap can be obtained.
b
See lessExplanation: The air gap flux density, air gap constant, air gap length are calculated first. On substitution, the mmf required for air gap can be obtained.
What is the value of the flux density with respect to average flux density?
a Explanation: The value of flux density at 60° from the interpolar axis as far as gap and teeth are used in the calculation of mmf. The value of flux density = 1.67 times of average flux density.
a
See lessExplanation: The value of flux density at 60° from the interpolar axis as far as gap and
teeth are used in the calculation of mmf. The value of flux density = 1.67 times of
average flux density.
What is the angle at which the value of the flux density should be for the calculation of mmf?
b Explanation: The calculation of mmf should be based upon the value of the flux density. The value of flux density at 60° from the interpolar axis as far as gap and teeth are concerned.
b
See lessExplanation: The calculation of mmf should be based upon the value of the flux density. The value of flux density at 60° from the interpolar axis as far as gap and teeth are concerned.
How many parts does the stator mmf passes through?
c Explanation: The stator mmf produced in the motor passes through 5 parts. They are air gap, stator teeth, stator core, rotor teeth, rotor core.
c
See lessExplanation: The stator mmf produced in the motor passes through 5 parts. They are air gap, stator teeth, stator core, rotor teeth, rotor core.
How many factors are present in the operating characteristics?
c Explanation: There are 4 operating characteristics present in the single phase induction motor. They are mmf for air gap, saturation factor, iron loss, friction and windage loss.
c
See lessExplanation: There are 4 operating characteristics present in the single phase induction motor. They are mmf for air gap, saturation factor, iron loss, friction and windage loss.
What is the output equation of a single phase induction motor developed by P.H Tricky?
b Explanation: The output coefficient, horse power, frequency constant, motor type constant along with the speed is calculated. On substitution we get the diameter2 * length value.
b
See lessExplanation: The output coefficient, horse power, frequency constant, motor type
constant along with the speed is calculated. On substitution we get the diameter2 * length value.
What factor is the core length made equal to in theoretical conditions?
c Explanation: The core length is made equal to the pole length in theoretical conditions. But in practical the exact dimensions are governed by manufacturing conditions.
c
See lessExplanation: The core length is made equal to the pole length in theoretical conditions. But in practical the exact dimensions are governed by manufacturing conditions.
What is the formula of the saturation factor?
c Explanation: The total mmf required for the magnetic circuit and the mmf required for air gap is calculated. On substitution of the values the saturation factor is calculated.
c
See lessExplanation: The total mmf required for the magnetic circuit and the mmf required for air
gap is calculated. On substitution of the values the saturation factor is calculated.
The magnetizing reactance is directly proportional to the saturation factor.
b Explanation: The magnetizing reactance is one of the components used in the leakage reactance calculations. The magnetizing reactance is indirectly proportional to the saturation factor.
b
See lessExplanation: The magnetizing reactance is one of the components used in the leakage
reactance calculations. The magnetizing reactance is indirectly proportional to the
saturation factor.
What is the relation between pole pitch and the magnetizing reactance?
b Explanation: The magnetizing reactance is one of the parameters in the leakage reactance calculation. The magnetizing reactance is directly proportional to the pole pitch.
b
See lessExplanation: The magnetizing reactance is one of the parameters in the leakage
reactance calculation. The magnetizing reactance is directly proportional to the pole
pitch.