8. Which is the term that is no connection with boring operation?

(A) Omnginate a hole (B) Enlarge a hole
() Finish a hale (D) Positioning a hole
9. Which is the ool has no connection with checking and measuring a screw thread?
(ಯ) Screw pitch gauge (B) Thread ring gauge
(¢) Thread chasing dial (D) Screw thread micrometer

10. An universal bevel protractor has an accuracy of :
(ക) 10 minutes (B) 5 minutes
(C) 1 minutes (D) 24 minutes

11. The steel containing 0.8% carbon, the steel has a structure of :

(3) Cementite (18) Peardite
(£) Martensite (D) Ferrite
12. While heating a stecl the ‘austenite’ structure is formed at 723°C, this temperature is
called :
(A} Upper critical temperature ‏بت‎ Melting temperature
{C) Tempering point temperature (D) Lower critical temperature

18. A pipe thread has an angle of :

(^) 60 (ए) 45
(©) 55" യ) 29
14. Tool maker's button is used while boring for :
(ಹಿ) Accurate boring (0) More finish
)© Accurate roundness (D) Accurate positioning the hole

15. For turning a multi-start thread of 2 mm pitch, we can find out the gears. For caleulating the
change gears we can take the lead’ of work is :

(ಯ) 6mm (B) 2 x No.of starts
)0 6= No.of starts (M 2mm

16. A clearance angle should be provided from the helix angle leading side and following side.
The helix angle of the thread at the leading side is :

Lead Lead
‏تم‎ Minor dia. ಯ Major dia.
Lead Lead
ಲು ಸ್ಯಾ (1 ‏لت‎
‎© Pitch dia. ۳ Nominal dia.

168/2014 4 A