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What are the factors the slot leakage permeance will depend upon?
Answer: d Explanation: The slot leakage permeance depends upon the shape of the slots. The slot leakafe permeance also depends upon the arrangement of winding in the slot.
Answer: d
See lessExplanation: The slot leakage permeance depends upon the shape of the slots. The slot leakafe permeance also depends upon the arrangement of winding in the slot.
How many assumptions can be used for the slot leakage calculation?
Answer: b Explanation: There are 3 assumption made in the slot leakage calculation. They are the current in the slot conductors is uniformly distributed, the leakage path is straight across the slot and around the iron at the bottom and the permeance of air paths is only considered.
Answer: b
See lessExplanation: There are 3 assumption made in the slot leakage calculation. They are the current in the slot conductors is uniformly distributed, the leakage path is straight across the slot and around the iron at the bottom and the permeance of air paths is only considered.
What are the equations that are to be satisfied by flux patterns?
Answer: c Explanation: The flux patterns must satisfy the Poisson equation within the section of the conductors. The flux patterns must satisfy the Laplace equation in the other parts.
Answer: c
See lessExplanation: The flux patterns must satisfy the Poisson equation within the section of the conductors. The flux patterns must satisfy the Laplace equation in the other parts.
What is the value of constant ‘a’ in the core part of the ac machines?
Answer: a Explanation: The value of constant ‘a’ in the core part of the ac machines is 4.7 and that in the teeth part is 6.5. The value of constant ‘a’ in the core part of the dc machines is 6.5 and that in the teeth part is 2.3.
Answer: a
See lessExplanation: The value of constant ‘a’ in the core part of the ac machines is 4.7 and that in the teeth part is 6.5. The value of constant ‘a’ in the core part of the dc machines is 6.5 and that in the teeth part is 2.3.
What must be done in order to take additional iron losses into account in dc machines?
Answer: b Explanation: In order to take additional losses into account the iron loss obtained from the iron loss curves is multiplied into 1.4-1.6 in dc machines and synchronous machines. The iron loss obtained from the iron loss curves is multiplied into 1.2-1.4 in induction motors.
Answer: b
See lessExplanation: In order to take additional losses into account the iron loss obtained from the iron loss curves is multiplied into 1.4-1.6 in dc machines and synchronous machines. The iron loss obtained from the iron loss curves is multiplied into 1.2-1.4 in induction motors.
What is the relation between resistivity, magnetizing mmf and magnetizing current?
Answer: b Explanation: The high resistivity materials are made use of to reduce the eddy current loss. The high resistivity materials have high magnetizing mmf which in turn leads to high magnetizing current.
Answer: b
See lessExplanation: The high resistivity materials are made use of to reduce the eddy current
loss. The high resistivity materials have high magnetizing mmf which in turn leads to
high magnetizing current.
How are the eddy current losses in the machine reduced?
Answer: d Explanation: Eddy current loss is one type of loss present under the iron or core loss. It can be reduced by laminating the core.
Answer: d
See lessExplanation: Eddy current loss is one type of loss present under the iron or core loss. It can be reduced by laminating the core.
What is the formula to obtain the hysteresis loss devised by Steinmetz?
Answer: c Explanation: The hysteresis coefficient along with the frequency of magnetization and maximum flux density is calculated first. Next the Steinmetz coefficient is calculated and on substitution it gives the hysteresis loss.
Answer: c
See lessExplanation: The hysteresis coefficient along with the frequency of magnetization and
maximum flux density is calculated first. Next the Steinmetz coefficient is calculated and on substitution it gives the hysteresis loss.
What is the other name for the iron loss?
Answer: d Explanation: When ferromagnetic materials are subjected to a flux in a fixed direction in space and having a magnitude varying in time, losses are produced in the machine. This is called iron loss or core loss.
Answer: d
See lessExplanation: When ferromagnetic materials are subjected to a flux in a fixed direction in space and having a magnitude varying in time, losses are produced in the machine. This is called iron loss or core loss.
What is the formula of the leakage coefficient?
Answer: b Explanation: The total flux is the addition of the useful flux and the leakage flux is first calculated. On substitution the leakage coefficient can be obtained.
Answer: b
See lessExplanation: The total flux is the addition of the useful flux and the leakage flux is first calculated. On substitution the leakage coefficient can be obtained.