# Manufacturing Engineering Questions & Answers – Lathe-1

This set of Manufacturing Engineering MCQs focuses on “Lathe-1”.

1. Which of the following is correct about series of range of speed in simple lathe?
a) Geometric progression
b) Arithmetic progression
c) Logarithmic progression
d) Harmonic progression

Explanation: Geometric progression is the series of numbers having a common ratio. Range of speed follow geometric progression in simple lathe.

2. Which of the following is the correct basis in designing feed gear box for screw cutting?
a) Geometric progression
b) Arithmetic progression
c) Logarithmic progression
d) Harmonic progression

Explanation: Geometric progression is the series of numbers having a common ratio. Feed gears box have ranges following geometric progression.

3. If cutting tool travel 1000mm in the direction of feed motion with work piece rotational speed of 500 rpm and feed rate of 0.2mm/rev, machining time in minutes will be
a) 2
b) 6
c) 8
d) 10

Explanation: Use t=L/ FN) where ‘t’ is time, ”L’ is effective length, ‘F’ is feed and ‘N’ is number of revolution per second.

4. Facing of work piece of diameter 72mm is need to be done at spindle speed of 80 rev per min at cross feed of 0.3mm/rev. The time required in minute for facing operation will be
a) 2
b) 1.5
c) 2.5
d) 3

Explanation: Time required for machining is given by, t=L/ FN) where ‘t’ is time, ”L’ is effective length, ‘F’ is feed and ‘N’ is number of revolution per second.

5. Compound rest swiveling method in taper turning operation is most suitable for
a) Long jobs with small taper angles
b) Short jobs with small taper angles
c) Short jobs with steep taper angles
d) Long jobs with steep taper angles

Explanation: Compound rest swiveling method gives less space and less revolution and hence in taper turning operation it is most suitable for Short jobs with steep taper angles.
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6. In which of the following, tail stock method of taper turning operation will be preferred more?
a) Internal tapers
b) Steep tapers
c) Small tapers
d) Long slender tapers

Explanation: For long slender tapers, tail stock over method is most suitable because tail stock method gives large space and large taper angle also.

7. Which of the followings is the correct type of threads used in lead screw having half nut in the lathe which is free to rotate in both directions?

Explanation: ACME threads have greater efficiency than other profiles of threads and hence are used in lead screw.

8. Which of the following is used to produce quality screw threads?
b) Thread cutting with single point tool
c) Thread milling ad cutting with single point tool

Explanation: Quality screw threads are produced by using thread chasing, which is a very precise operation.

9. 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
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.

10. 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.

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