Basics in Manufacturing Engineering : Practice MCQ Questions & Answers with Explanations

Circle passing through the top of the tips of teeth is known as addendum circle.

Space width is the width of tooth space along the pitch circle.

Lead screw will move axially equal to pitch of lead screw after one complete rotation of lead screw.

Lead screw will move axially equal to pitch of lead screw after one complete rotation of lead screw.

Speed of lead screw decreases in relative to speed of spindle as many times the required pitch is larger than pitch of lead screw.

Number of starts and pitch of lathe is directly proportional to speed of spindle required.

Compound rest method is generally used for taper turning on internal surfaces.

Radial, axial and tangential forces are encountered during groove cutting on a lathe machine.

3-jaw chucks are also known as self centered chuck, hence they have 3 jaws.

Vibration is the major problem during turning of slandered rod due to which it is advised to keep transverse force minimum during turning of slender rod.

Distribution of load over all teeth is the main advantage of using thread chaser for thread cutting operation.

Thread chasers are multipoint cutting tool used for cutting threads.

A=2√2×r and APF = (volume of effective number of atoms/volume of unit cell).

No explanation is available for this question yet.

R=(√3)/4×a and APF = (volume of effective number of atoms/volume of unit cell).

A=r and APF = (volume of effective number of atoms/volume of unit cell).

No explanation is available for this question yet.

In an FCC unit cell, there are eight atoms: one at each corner of the cube and six face centered atoms of the six planes of the cube. As corner atoms are shared by eight adjacent cubes and the face centered atoms by two adjacent unit cells, total effective number of atoms in an FCC unit cell will be 4.

Total number of atoms at corners = 8 and each corner atom is shared by total 8-unit cells. Thus, effective number of atoms in an SC unit cell: 8 × 8⁄8 = 1.

For any corner atom of the BCC unit cell, the nearest atoms are the body centred atoms. There are eight-unit cells in neighbours with body-centered atoms. Hence, the coordination number for a BCC cubic unit cell is 8.