Question: A 250-V, 4-pole, wave-wound d.c. series motor has 782 conductors on itsarmature. It has armature and series field resistance of 0.75 ohm. The motor takesa current of 40 A. Estimate its speed and gross torque developed if it has a flux per pole of 25 mWb Answer: Step 1 Mechanical Engineering homework question answer, step 1, image 1 Mechanical Engineering homework question answer, step 1, image 2 Step 2 Mechanical Engineering homework question answer, step 2, image 1 Step 3 Mechanical Engineering homework question answer, step 3, image 1

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Ans6:

a) No touch safety class : Christmas trees and Brass lamps

b) PE protected safety class: Iron, Toasters, Microwaves, Refrigerators and Electric heating Kettles.

c) Double insulation safety class : Drills, Coffee makers, Personal Computers, Televisions, Hair Dryers and Vacuum Cleaners.

d) Isolating Transformer safety class: Mesurement devices, Laptops, Mobile Phones and Power electronic devices.