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One of the following is not included in the 'Rocher mechanism':

AMain spring

BLoose dog

CEscapement wheel

DPinion wheel

Answer:

A. Main spring


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The standard typewriter keyboard layout used throughout the world is
If there is one dog in a typewriter, How many escapement wheel is required to operate the typewriter ?
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Reason/Reasons for ‘jerky’ movement of the Carriage?

  1. Over tension of the Mainspring
  2. Low tension of the Mainspring
  3. Worn out of teeth of escapement wheel