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How is the number of armature slots associated with the leakage reactance?
Answer: a Explanation: When the number of slots is small the leakage flux is increased. As the leakage flux is increased, the leakage reactance is increased owing to conductors lying near each other
Answer: a
Explanation: When the number of slots is small the leakage flux is increased. As the leakage flux is increased, the leakage reactance is increased owing to conductors lying near each other
See lessHow is the number of armature slots associated with the hotspot temperature?
Answer: b Explanation: The small number of slots leads to an increase in hotspot temperature. The small number of slots results in bunching of conductors leaving small space for circulation of air.
Answer: b
Explanation: The small number of slots leads to an increase in hotspot temperature. The small number of slots results in bunching of conductors leaving small space for circulation of air.
See lessHow is the number of armature slots associated with the cost factor?
Answer: a Explanation: The smaller the number of slots, the less will be the cost. This is because there are fewer coils to wind, form insulate, place into slots, and connect.
Answer: a
Explanation: The smaller the number of slots, the less will be the cost. This is because there are fewer coils to wind, form insulate, place into slots, and connect.
See lessHow is the number of armature slots associated with the armature windings?
Answer: b Explanation: The number of slots should be such that balanced winding is obtained. Balanced windings should be obtained because it may lead to losses and heating effects.
Answer: b
Explanation: The number of slots should be such that balanced winding is obtained. Balanced windings should be obtained because it may lead to losses and heating effects.
See lessHow many factors are related in the selection of the armature slots?
Answer: b Explanation: There are 6 factors associated with the selection of the armature slots. They are i) Balanced windings ii) Cost iii) Hot spot temperature iv) Leakage reactance v) Tooth ripples vi) flux density in iron.
Answer: b
Explanation: There are 6 factors associated with the selection of the armature slots. They are i) Balanced windings ii) Cost iii) Hot spot temperature iv) Leakage reactance v) Tooth ripples vi) flux density in iron.
See lessWhen is the double layer bar or wave windings made use of?
Answer: c Explanation: The double layer bar or wave windings are used when the single turns coils are necessary. They are also made use of with the multipolar low voltage machines.
Answer: c
See lessExplanation: The double layer bar or wave windings are used when the single turns coils are necessary. They are also made use of with the multipolar low voltage machines.
The single layer windings have higher efficiency and quieter operation because of narrow slot openings.
Answer: a Explanation: The single layer winding has high efficiency and quiet operation because of narrow slot openings. They also have higher space factor owing to the absence of inter layer separator.
Answer: a
See lessExplanation: The single layer winding has high efficiency and quiet operation because of narrow slot openings. They also have higher space factor owing to the absence of inter layer separator.
Which among the following makes double layer windings advantageous than the single layer windings?
Answer: d Explanation: The double layer windings have an advantage over single layer windings because of ease in the manufacture of coils and lower cost of winding, less number of coils are required as spare in the case of winding repairs, fractional slot windings can be employed.
Answer: d
See lessExplanation: The double layer windings have an advantage over single layer windings
because of ease in the manufacture of coils and lower cost of winding, less number of
coils are required as spare in the case of winding repairs, fractional slot windings can be employed.
Which type of machines have a large number of poles per phase?
Answer: b Explanation: The high voltage machines have a large number of poles per phase. The small value of flux per pole per phase also results in large number of poles per phase.
Answer: b
Explanation: The high voltage machines have a large number of poles per phase. The small value of flux per pole per phase also results in large number of poles per phase.
See lessWhen are the double layer bar windings made use of during the armature design?
Answer: a Explanation: The double layer bar windings are made use of when there is large values of flux per poles. The double layer bar windings are made use of when there are small number of turns per phase.
Answer: a
Explanation: The double layer bar windings are made use of when there is large values of flux per poles. The double layer bar windings are made use of when there are small number of turns per phase.
See less