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In a screw gauge pick up the correct sta...

In a screw gauge pick up the correct statement(s)

A

Positive error exists when the head scasle's zeroth division is above the base line of the pitch scale, when the two studs are in contach.

B

Positive error exists, when the head scales zeroth division is below the base line of pitch scale, when the two studs are in contact.

C

Negative error exists, the head scale's zeroth division is above the base line of the pitch scale, when the two studs, are in contact.

D

Negative error exists, the head scale's zeroth division is below the base line of the pitch scale, when the two studs are in contact

Text Solution

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The correct Answer is:
A, D
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