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While typing get jerky space on the same spot in every line due to :

(1) Lack of oiling

(2) Breaking of a tooth of Escapement Wheel

(3) Breaking of a tooth of Pinion Wheel

(4) Breaking of a tooth of Carriage Racka

A(4) only

B(3) only

C(1) only

D(3) and (4) only

Answer:

A. (4) only


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