At what standard temperature are the gauges kept in the section ?

15) Fixed type snap gauges have 'Go' and 'No Go' ends

16) In a taper plug gauge the 'Go' and 'No Go' sizes are denoted by a step on

17) Which one of the following gauges is used for checking cylinders, which are not kept in vertical or horizontal position ?

18) Which one of the following grade of gauges is used for checking the parts made by an operator in the workshop ?