86 practice sets · Page 3 of 5
Circle passing through the top of the tips of teeth is known as
Addendum circle
Dedendum circle
Addendum
Dedendum
Correct Answer: A — Addendum circle
Explanation:
Circle passing through the top of the tips of teeth is known as addendum circle.
Width of tooth space along the pitch circle is known as
Clearance
Space width
Full depth of teeth
Working depth of teeth
Correct Answer: B — Space width
Explanation:
Space width is the width of tooth space along the pitch circle.
Speed of lead screw decreases in relative to speed of spindle as many times the required pitch is smaller than pitch of lead screw.
False
True
Correct Answer: A — False
Explanation:
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.
True
False
Correct Answer: A — True
Explanation:
Lead screw will move axially equal to pitch of lead screw after one complete rotation of lead screw.
Let screw of 2mm pitch is needed to be cut on lathe machine. Lead screw of lathe has pitch of 6mm. Which of the following statement is correct?
Speed of lead screw> speed of spindle
None of the mentioned
Speed of lead screw=speed of spindle
Speed of lead screw< speed of spindle
Correct Answer: D — Speed of lead screw< speed of spindle
Explanation:
Speed of lead screw decreases in relative to speed of spindle as many times the required pitch is larger than pitch of lead screw.
Lead screw of lathe have double start thread with a pitch of 4mm. What should be the ratio of speed between lead screw and spindle for producing a single start thread of 2 mm pitch?
1:3
1:4
1:5
1:2
Correct Answer: B — 1:4
Explanation:
Number of starts and pitch of lathe is directly proportional to speed of spindle required.
Which of the following will give the best result for taper turning on the internal surface?
Using tailstock offset method
Using compound rest method
Using form tool
Using taper attachment method
Correct Answer: B — Using compound rest method
Explanation:
Compound rest method is generally used for taper turning on internal surfaces.
During groove cutting in a lathe, by using a parting tool, which of the following forces are encountered?
Radial
Tangential, Radial and Axial
Tangential
Tangential and Radial
Correct Answer: B — Tangential, Radial and Axial
Explanation:
Radial, axial and tangential forces are encountered during groove cutting on a lathe machine.
Self centered chuck has ___ number of jaws.
2
3
1
10
Correct Answer: B — 3
Explanation:
3-jaw chucks are also known as self centered chuck, hence they have 3 jaws.
Which of the following is the correct reason for keeping transverse force minimum in turning of slender rod?
To enhances surface finish
To increase productivity
To increase efficiency of cutting
To reduce undesired vibration during turning
Correct Answer: D — To reduce undesired vibration during turning
Explanation:
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.
Total load is distributed over all teeth when thread cutting is done using thread chaser.
False
True
Correct Answer: B — True
Explanation:
Distribution of load over all teeth is the main advantage of using thread chaser for thread cutting operation.
What are thread chasers?
A work holding device
Single point cutting tool
Multipoint cutting tool
None of the mentioned
Correct Answer: C — Multipoint cutting tool
Explanation:
Thread chasers are multipoint cutting tool used for cutting threads.
The atomic packing fraction in a face centered cubic unit is?
0.68
0.66
0.52
0.74
Correct Answer: D — 0.74
Explanation:
A=2√2×r and APF = (volume of effective number of atoms/volume of unit cell).
If the radius of a copper atom is given as 1.Ao, its density (in kg/mwill be?
100.01
86.25
7968
8979
Correct Answer: D — 8979
Explanation:
No explanation is available for this question yet.
The atomic packing fraction in a body centered cubic unit is cell is ________
0.66
0.74
0.68
0.52
Correct Answer: C — 0.68
Explanation:
R=(√3)/4×a and APF = (volume of effective number of atoms/volume of unit cell).
The atomic packing fraction in a simple cubic unit cell is ________
0.52
0.68
0.66
0.74
Correct Answer: A — 0.52
Explanation:
A=r and APF = (volume of effective number of atoms/volume of unit cell).
Effective number of atoms in a body centered cubic (BCC) unit cell is equal to _____________
4
2
6
1
Correct Answer: B — 2
Explanation:
No explanation is available for this question yet.
Effective number of atoms in a face centered cubic (FCC) unit cell is equal to ________
4
8
2
1
Correct Answer: A — 4
Explanation:
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.
Effective number of atoms in a simple cubic (SC) unit cell is equal to _________
2
4
8
1
Correct Answer: D — 1
Explanation:
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.
What is the coordination number of body centered cubic unit cell?
8
2
4
6
Correct Answer: A — 8
Explanation:
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.
