MM- Weekly test 5

Who gave the fundamental principle of straightness measurement?

• Bryan

• Moire

• Euler

• Amedeo

Which of the following represents the quality of straightness in precision engineering?

• Spirit level

• Straight edge

• Autocollimator

• Dial indicator

What is the tolerance of the straightness of a line?

• Maximum deviation from the straight line joining two extremities

• Maximum deviation from the middle point of straight line joining two extremities

• Minimum deviation from the straight line joining two extremities

• Minimum deviation from the middle point of straight line joining two extremities

For checking straightness, straight edge is placed over a surface and these two are viewed against the light. Which of the following option true if colour of light is red?

• Gap between 0.12 to 0.17 mm

• Gap between 0.2 to 0.7 mm

• Gap between 1.7 to 2 mm

• Gap between 0.0012 to 0.0017 mm

What is the range of straightness measurement in straightness measurement optics?

• ±2.5 mm

• ±5 mm

• ±10 mm

• ±20 mm

What is the name of screw thread which is formed on a cone?

• Parallel screw thread

• Straight screw thread

• Tapered screw thread

• Cylindrical screw thread

What is dedendum for external threads?

• Radial distance between pitch and minor cylinder

• Radial distance between major and pitch cylinder

• Radial distance between major and minor cylinder

• Axial distance between major and pitch cylinder

Which of the following is not a name of the major diameter of an external thread?

• Outside diameter

• Crest diameter

• Full diameter

• Cone diameter

Which of the following is not true about the axial thickness of screw thread?

• Measured in direction perpendicular to the axis of thread

• Measured on pitch cylinder

• Distance between opposite faces of same thread

• Measured at the same thread

Flanks of the threads connect the crest with the roots.

• True

• False