A NEMA (National Electrical Manufacturers Association) classifies induction motors into categories according to torque, current, and other importan...
A NEMA (National Electrical Manufacturers Association) classifies induction motors into categories according to torque, current, and other important characteristics for projects. Considering these categories, about category A motors, choose the correct alternative.
Type A is the most common type and has a lower initial current K. It has a high starting torque, making it suitable for driving larger loads.
It has the highest of all starting torques and the final speed is lower. It is the ideal type for applications K D in which there are large speed variations.
It has a normal starting torque (150 to 170% of rated power) and E a relatively high starting current.
a) Only statement I is correct.
b) Only statement II is correct.
c) Only statement III is correct.
d) Statements I and II are correct.
e) Statements I and III are correct.
Type A is the most common type and has a lower initial current K. It has a high starting torque, making it suitable for driving larger loads.
It has the highest of all starting torques and the final speed is lower. It is the ideal type for applications K D in which there are large speed variations.
It has a normal starting torque (150 to 170% of rated power) and E a relatively high starting current.
a) Only statement I is correct.
b) Only statement II is correct.
c) Only statement III is correct.
d) Statements I and II are correct.
e) Statements I and III are correct.
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Ed 
A alternativa correta é a letra D) Statements I and II are correct. A categoria A é a mais comum e tem uma corrente inicial mais baixa. Ela tem um alto torque de partida, tornando-a adequada para acionar cargas maiores. Além disso, ela tem o mais alto de todos os torques de partida e a velocidade final é menor. É o tipo ideal para aplicações em que há grandes variações de velocidade. Portanto, as afirmações I e II estão corretas, enquanto a afirmação III está incorreta, pois a categoria A tem uma corrente de partida relativamente baixa, e não alta.
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