Manufacturing Engineering Multiple Choice Questions & Answers on “Lathe-2”.
1. Which of the following is the correct reason for keeping transverse force minimum in turning of slender rod?
a) To enhances surface finish
b) To increase productivity
c) To increase efficiency of cutting
d) To reduce undesired vibration during turning
Answer: d
Clarification: 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.
2. Self centered chuck has ___ number of jaws.
a) 10
b) 1
c) 2
d) 3
Answer: d
Clarification: 3-jaw chucks are also known as self centered chuck, hence they have 3 jaws.
3. During groove cutting in a lathe, by using a parting tool, which of the following forces are encountered?
a) Tangential
b) Radial
c) Tangential, Radial and Axial
d) Tangential and Radial
Answer: c
Clarification: Radial, axial and tangential forces are encountered during groove cutting on a lathe machine.
4. Which of the following will give the best result for taper turning on the internal surface?
a) Using tailstock offset method
b) Using taper attachment method
c) Using form tool
d) Using compound rest method
Answer: d
Clarification: Compound rest method is generally used for taper turning on internal surfaces.
5. 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?
a) 1:2
b) 1:3
c) 1:4
d) 1:5
Answer: c
Clarification: Number of starts and pitch of lathe is directly proportional to speed of spindle required.
6. 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?
a) Speed of lead screw> speed of spindle
b) Speed of lead screw< speed of spindle
c) Speed of lead screw=speed of spindle
d) None of the mentioned
Answer: b
Clarification: Speed of lead screw decreases in relative to speed of spindle as many times the required pitch is larger than pitch of lead screw.
7. Speed of lead screw decreases in relative to speed of spindle as many times the required pitch is larger than pitch of lead screw.
a) True
b) False
Answer: a
Clarification: Lead screw will move axially equal to pitch of lead screw after one complete rotation of lead screw.
8. Speed of lead screw decreases in relative to speed of spindle as many times the required pitch is smaller than pitch of lead screw.
a) True
b) False
Answer: b
Clarification: Lead screw will move axially equal to pitch of lead screw after one complete rotation of lead screw.
9. What are thread chasers?
a) Multipoint cutting tool
b) Single point cutting tool
c) A work holding device
d) None of the mentioned
Answer: a
Clarification: Thread chasers are multipoint cutting tool used for cutting threads.
10. Total load is distributed over all teeth when thread cutting is done using thread chaser.
a) True
b) False
Answer: a
Clarification: Distribution of load over all teeth is the main advantage of using thread chaser for thread cutting operation.
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