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Monday, 27 November 2017

Wear allowance is provided on

  MOHAMMAD ZEESHAN       Monday, 27 November 2017
Wear allowance is provided on
A. go gauge
B. no go gauge
C. both go and no go gauges
D. when both are combined in one gauge
Answer: A. go gauge

A go-no gauge (or go/no-go) refers to an inspection tool used to check a workpiece against its allowed tolerances. Its name is derived from two tests: the check involves the workpiece having to pass one test (go) and fail the other (no-go).

Wear allowance is provided on go gauge.

WEAR ALLOWANCE.- A contact is service as long as its wear allowance, and its associated contacts, exceeds the minimum value specified by the manufacturer. (Usually the minimum value is 0.015 to 0.030 inch). The "wear allowance" of contacts is defined as the total thickness of contact material which may be worn away before the contact of two associated surfaces becomes inadequate to carry rated current. In an electric-motor contactor, the wear allowance of the power pole contacts is usually related to the closed position of the magnetic operator. The wear allowance of the power pole contacts of a magnetic contactor is the amount of silver that can be worn away without resulting in failure of the contacts to touch when the magnetic operator is at its closed position.

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