fitter trade ncvt top 16 mcq

01. The tooth thickness of the rack is measured by?

Gear tooth vernier caliper.

02.induction coil is made from which material?

copper.


Explanation:-

An induction coil consists of two coils of insulated wire wound around a common iron core (M). One coil, called the primary winding (P), is made from relatively few (tens or hundreds) turns of coarse wire. The other coil, the secondary winding, (S) typically consists of many (thousands) turns of fine wire.

03.solder is an alloy of 

tin and lead.

04.which metal is used for a bit of hatched soldering iron

copper.

Explanation:-

Soldering iron tips are made of a copper core plated with iron. The copper is used for heat transfer and the iron plating is used for durability. Copper is very easily corroded, eating away the tip, particularly in lead-free work; iron is not.

05.which type of flux used for brazing

borax.

Explanation:-

Flux. Unless brazing operations are contained within an inert or reducing atmosphere environment (i.e. a vacuum furnace), a flux such as borax is required to prevent oxides from forming while the metal is heated. The flux also serves the purpose of cleaning any contamination left on the brazing surfaces.

06.what is the name of filler metal in brazing

base metal.

07. the spirit level is used for

indicate whether a surface is a level on the horizontal or vertical planes.

08.which gauge is used an external thread of the pipe

Thread ring gauge.

Explanation:-

A ring gauge, or ring gauge, is a cylindrical ring of thermally stable material, often steel, whose inside diameter is finished to gauge tolerance and is used for checking the external diameter of a cylindrical object.

09.which of the following is the including angle of pipe thread

55 degrees.

10.Most V-threads angle

60 degrees.

11. Whitworth threads angle is

55 degrees.

12.Knuckle thread or 
Round thread angle is 

30 degrees.

13. The Acme thread form has a 

29° thread angle.

14.In case of the trapezoidal thread form 

the angle is 30°.

15.buttress thread angle is

45 degrees.

16.buttress thread is used for 

great force is only required in one direction.