1. Which of the following can produce both external as well as internal threads?
a) Die threading with self‐opening die heads
b) Thread tapping with taps
c) Thread milling and multiple‐thread cutters
d) Thread chasing with multiple‐rib chasers
Explanation: Thread milling and multiple thread cutters are generally used for the production of internal and external threads.
2.In surface finishing operation one should use a sharp tool with a ______ feed and _______ Speed of rotation of the job.
a) Minimum, minimum
b) Minimum, maximum
c) Maximum, maximum
d) Maximum, minimum
Explanation: Minimum feed and maximum speed of rotation gives very small material removal rate and hence used for surface finishing operation.
3. 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
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.
4. Self centered chuck has ___ number of jaws.
a) 10
b) 1
c) 2
d) 3
Explanation: 3-jaw chucks are also known as self centered chuck, hence they have 3 jaws.
5. 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
Explanation: Radial, axial and tangential forces are encountered during groove cutting on a lathe machine.
6. 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
Explanation: Compound rest method is generally used for taper turning on internal surfaces.
7. 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
Explanation: Number of starts and pitch of lathe is directly proportional to speed of spindle required
8. 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
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
9. 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
Explanation: Lead screw will move axially equal to pitch of lead screw after one complete rotation of lead screw.
10. 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
Explanation: Lead screw will move axially equal to pitch of lead screw after one complete rotation of lead screw.