I just need answers C) You are in.charge.of specifying a motor to run a pump in

Question

I just need answers

C) You are in.charge.of specifying a motor to run a pump in a factory that makes fruit juices. The motor is run continuously except for product changeovers, when production is converted from apple juice to orange juice and back. Temperatures in the plant are held between 15°C and 25°C. Humidity is controlled between 20% and 50%. What type of motor should you specify? 1) Washdown 2) IEEE 841-2001 Severe Duty 3) Explosion Proof 4) Totally Enclosed Fan Cooled (TEFC) 5) Totally Enclosed Nonventilated (TENV) (H)Suppose you create a Lorentz Force by passing a current through a conductor located in a magnetic field. What would happen to the Lorentz Force, if you reversed the direction of both the magnetic field and the direction of the flow of current at the same time? (1) The Lorentz force would double (2) The Lorentz force would go to zero (3) Nothing (4) The Lorentz force would switch direction (5) None of the above.

Explanation / Answer

C. In this case we will use totally enclosed fan cooled motor to avoid the seepage of any liquid into the motor, which may damage the motor operation. Option D

2. The lorentz force would switch direction because it is the vector sum of force due to external magnetic field and electric field. And since the direction of both the fields are reversed, therefore lorentz force will also get reversed. So D is the correct option.

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