12) The root of ISO metric thread is :

Flat

Round

Sharp corner

None of the above

Answer is:

Round

Explanation:

The root of ISO metric thread is Round

Square thread

'V' thread

Saw-tooth thread

Knuckle thread

Answer is:

Explanation:

In Saw tooth threaded assembly sliding force acts in one direction only.

30 Degree

45 Degree

55 Degree

60 Degree

Answer is:

Explanation:

B.S.F screw threads have the included angle of 55 degree.

0.64 P

0.7035 P

0.6 P

0.61 P

Answer is:

Nominal diameter of the rod

Imaginary diameter in between the major and minor diameters of the thread

Minimum diameter of the thread

Maximum diameter of the thread

Answer is:

Explanation:

Pitch diameter of a screw thread is the imaginary diameter in between the major and minor diameter of the thread.