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What is the formula for dispersion coefficient?
Answer: a Explanation: First the magnetizing current is calculated. Next the ideal short circuit current is calculated. The ratio of both gives the value of dispersion coefficient.
Answer: a
Explanation: First the magnetizing current is calculated. Next the ideal short circuit current is calculated. The ratio of both gives the value of dispersion coefficient.
See lessWhat is the relation between the leakage current and power factor?
Answer: b Explanation: Leakage current is indirectly proportional to the power factor. A small leakage current means a very good power factor.
Answer: b
Explanation: Leakage current is indirectly proportional to the power factor. A small leakage current means a very good power factor.
See lessWhat is the relation between the magnetizing current and power factor?
Answer: a Explanation: Magnetizing current is indirectly proportional to the power factor. As the magnetizing current is large, the power factor is poor.
Answer: a
See lessExplanation: Magnetizing current is indirectly proportional to the power factor. As the magnetizing current is large, the power factor is poor.
How many factors influence the power factor of an induction motor?
Answer: b Explanation: There are 2 factors which influence the power factor of an induction motor. They are magnetizing current and ideal short circuit current.
Answer: b
See lessExplanation: There are 2 factors which influence the power factor of an induction motor. They are magnetizing current and ideal short circuit current.
What is the formula for the mmf required for stator teeth?
Answer: c Explanation: First the mmf per meter of stator slots is calculated by its equation. Then the length of the flux path in rotor core is obtained and the product of both gives the stator teeth mmf value.
Answer: c
Explanation: First the mmf per meter of stator slots is calculated by its equation. Then the length of the flux path in rotor core is obtained and the product of both gives the stator teeth mmf value.
See lessWhat is the formula for the mmf required for stator teeth?
Answer: b Explanation: First the mmf per meter is obtained separately from its design equation. Then the depth of the stator slots is obtained and the product of both gives mmf required for stator teeth.
Answer: b
Explanation: First the mmf per meter is obtained separately from its design equation. Then the depth of the stator slots is obtained and the product of both gives mmf required for stator teeth.
See lessAt what angle with respect to the interpolar axis does the flux tube gives a good approximation?
Answer: c Explanation: The flux tube crossing the air gap at 60° from the interpolar axis will always give a good approximation. The calculation of the magnetizing mmf should be based upon the value of the flux density at 60° from the interpolar axis.
Answer: c
Explanation: The flux tube crossing the air gap at 60° from the interpolar axis will always give a good approximation. The calculation of the magnetizing mmf should be based upon the value of the flux density at 60° from the interpolar axis.
See lessWhen maximum values of the design factors are considered, what is the relation between flux and the magnetizing current?
Answer: b Explanation: The flux value is indirectly proportional to the magnetizing current. The flux is too small or rather the magnetizing current becomes high.
Answer: b
See lessExplanation: The flux value is indirectly proportional to the magnetizing current. The flux is too small or rather the magnetizing current becomes high.
What factors does the value of magnetizing current depend on?
Answer: d Explanation: If the permeability of iron were constant this would cause no difficulty. The value of magnetizing current would be accurately obtained by considering the mean mmf and the flux tube where this mean occurs.
Answer: d
Explanation: If the permeability of iron were constant this would cause no difficulty. The value of magnetizing current would be accurately obtained by considering the mean mmf and the flux tube where this mean occurs.
See lessThe flux is distributed sinusoidally and the mmf varies sinusoidally in a DC Machine.
Answer: b Explanation: In a DC Machine, the flux is assumed to be uniform over any cross section and the same mmf for all the paths. But in an induction machine, the flux is distributed sinusoidally, and the mmf varies sinusoidally.
Answer: b
Explanation: In a DC Machine, the flux is assumed to be uniform over any cross section and the same mmf for all the paths. But in an induction machine, the flux is distributed sinusoidally, and the mmf varies sinusoidally.
See less