I just need answers C) You need to specify an AC induction motor for a machine w

Question

I just need answers

C) You need to specify an AC induction motor for a machine which requires a minimum of 200 in-lbs (110.3 N-m) of locked rotor (i.e. starting) torque from the motor. Otherwise, the machine won't start. You find a motor on a web site that specifies 220 in-lb (121.3 N-m) of locked rotor torque. According to IEC 60034-1, what is the lowest locked rotor torque (in-lbs) that your motor will supply? D) Why is a TENV motor enclosure not suitable for an explosive gas environment? 1) There are no openings in the housing, and no provisions for cooling except large cast heat fins on the sides. 2) The electrical wiring and circuit board within the enclosure are not specified for intrinsic safety 3) There are no openings in the housing, and no provisions for cooling except large cast heat fins on the sides. 4) The enclosure cannot withstand an explosion of a specified gas or vapor inside it. 5) Items (2) and (4)

Explanation / Answer

D) 1) There are no openings in the housing, and no provisions for cooling except large cast heat fins on the sides. The motor has no cooling assistance and is not ventilated with a fan. It is also fully enclosed and the motor can only cool by releasing heat . Hence it is not suitable for explosive gas environment.

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