# Machine Tools Questions and Answers – Lathe : Cutting Parameters

This set of Machine Tools and Machining MCQs focuses on “Lathe : Cutting Parameters”.

1. ______ is the speed at which the metal is removed by the tool from the work piece.
a) feed
b) cutting speed
c) depth of cut
d) none of the mentioned

Explanation: It can be easily understood by looking at the definition of the cutting speed. Cutting speed is a peripheral speed of the work.

2. Which of the following represents the formula for cutting speed? cs =cutting speed, D= diameter of work, N= rpm.
a) cs = (3.14*D*N)
b) cs = (D*N)
c) cs = (3.14*D)/N
d) none of the mentioned

Explanation: Cs = (3.14*D*N) – This is the formula for finding the cutting speed.

3. Which of the following represent the unit of cutting speed?
a) meter*minute
b) meter*meter*minute
c) meter / minute
d) none of the mentioned

Explanation: In cutting speed’s formula, d-diameter expressed in meter and n is rpm – revolution per minute. By putting this units in cutting speed’s formula, we can easily obtain its unit as meter/minute.

4. _____ is the distance the tool advances for each revolution of the work.
a) feed
b) depth of cut
c) metal removal rate
d) none of the mentioned

Explanation: The feed of a cutting tool in a lathe work is the distance the tool advances for each revolution of the work. Increased feed reduces the cutting time.

5. Which of the following is the unit of the feed?
a) mm / minute
b) mm / revolution
c) mm * minute
d) none of the mentioned

Explanation: Mm / revolution is the right unit for feed. In British system it is expressed in inches per revolution.
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6. The depth of cut is the_____ distance measured from the machined surface to the surface of the work piece, which is uncut.
a) parallel
b) perpendicular
c) at 45 degree
d) none of the mentioned

Explanation: It is the perpendicular distance measured from the machined surface to the surface of the work piece, which is uncut. Other factors remaining constant, the depth of cut varies inversely as the cutting speed.

7. Which of the following represents the formula for the depth of cut? d1=diameter of work surface before machining and d2=diameter of the machined surface
a) d1+d2
b) d1-d2
c) (d1+d2)/2
d) (d1-d2)/2

Explanation: (D1-d2) – this is the formula for depth of cut. Here both d1 and d2 are diameters and expressed in mm.

8. Which of the following represents the formula for metal removal rate?
a=cutting speed, b=depth of cut, c=feed, d=revolution
a) (a*b*d)/c
b) (a*b)/(c*d)
c) (a*b*c)/d
d) none of the mentioned

Explanation: (a*b*c)/d – This is the right formula for metal removal rate. Here a is expressed in mm/minute, b is expressed in mm, c is expressed in mm/revolution and d is simply revolution.

9. Which of the following represents the unit of metal removal rate?
a) mm/revolution
b) mm*mm/revolution
c) mm*mm*mm/revolution
d) none of the mentioned

Explanation: Mm*mm*mm / revolution is the right unit for the metal removal rate. If we put the units of cutting speed, depth of cut and feed in formula we can easily get this result.

10. Which of the following represents the unit for machining time?
a) mm / minute
b) minute / revolution
c) minute
d) none of the mentioned

Explanation: Machining time is simply a time so its unit must be matched with time’s unit. Minute is the right unit for machining time.

11. Which of the following represents the formula for the machining time? s=feed of the job per revolution, l=length of the job, n=rpm.
a) l / (s*n)
b) (s*n) / l
c) (l*s) / n
d) none of the mentioned

Explanation: Length of the job / (feed of the job per revolution*rpm) is the right for machining time. Also we can cross check the formula. Put the unit of each quantity and check in which formula we can get unit as a time’s unit.

12. For general purposes, ratio of the depth of cut to the feed varies from_____
a) 10:1
b) 1:10
c) 100:1
d) 1:100