Category: Machine Tools & Machining Objective Questions

Machine Tools Multiple Choice Questions on “Milling Machine Basics – 2”.

1. Difficulty is experienced in pouring coolant just on the cutting edge from where the chip begins. This is the disadvantage of______ process.
a) upmilling
b) downmilling
c) can’t say anything
d) none of the mentioned
Answer: a
Clarification: This is the disadvantage of upmilling. Use of cutting fluid is difficult in upmilling.

2. The work is pulled by cutter teeth and hence the job may get spoiled or breakaway. This is the disadvantage of _____ process.
a) upmilling
b) downmilling
c) can’t say anything
d) none of the mentioned
Answer: b
Clarification: This is the disadvantage of downmilling.In downmilling, job and tool movements are in same direction.

3. As the cutter progress, the chip accumulate at the cutting zone, spoils the work surfaces. This is the disadvantage of ______ process.
a) upmilling
b) downmilling
c) can’t say anything
d) none of the mentioned
Answer: a
Clarification: This is the disadvantage of upmilling. Cutter turns against the direction in which work is being fed.

4. Cutter teeth wears out soon as in the beginning itself the teeth comes in contact with the hard surface of the workpiece. This is the disadvantage of _______ process.
a) upmilling
b) downmilling
c) can’t say anything
d) none of the mentioned
Answer: b
Clarification: This is the disadvantage of downmilling. Cutter turns in similar direction in which the work is being fed.

5. The burr on the surface cleans during the cutting operation. This is the advantage of _______ process.
a) upmilling
b) downmilling
c) can’t say anything
d) none of the mentioned
Answer: b
Clarification: This is the advantage of downmilling. Its surface finish can be improved if it is free.

6. Upmilling is the process of removing metal by a cutter which is rotated _______ direction of the travel of the workpiece.
a) in the same
b) against the
c) can’t say anything
d) none of the mentioned
Answer: b
Clarification: As per the definition of upmilling process. This upmilling process is also known as conventional process.

7. Downmilling is the process of removing metal by a cutter which is rotated _______ direction of the travel of the workpiece.
a) in the same
b) against the
c) can’t say anything
d) none of the mentioned
Answer: a
Clarification: As per the definition of downmilling process.This downmilling process is also known as climb milling.

8. The thickness of the chip is ______ when the tooth begins its cut in downmilling.
a) maximum
b) minimum
c) zero
d) can’t say anything
Answer: a
Clarification: The cutting force vary from maximum to zero in downmilling so at the starting thickness of chip is maximum.

9. The thickness of the chip is ______ when the cut terminates in downmilling.
a) maximum
b) minimum
c) zero
d) can’t say anything
Answer: a
Clarification: From the working of downmilling, the cutting force vary from maximum to zero. So at the end thickness of chip is minimum.

10. For downmilling, _______ machines are used.
a) light
b) moderate
c) rigid
d) none of the mentioned
Answer: c
Clarification: Rigid machines are used in this process so that no clamping difficulty is there in downmilling.

11. In downmilling, the machine must have fixed on it a backlash error eliminator.
a) true
b) false
Answer: a
Clarification: As per the construction of this machine. This is done to make the forces strong enough on job to press down.

12. In downmilling, more springing actions are there in cutter.
a) true
b) false
Answer: b
Clarification: This is false. In downmilling, less springing actions are there in cutter.

13. Narrow slots can be milled in _________ milling process.
a) upmilling
b) downmilling
c) can’t say anything
d) none of the mentioned
Answer: b
Clarification: This is the advantage of downmilling process. In upmilling, it is difficult to mill narrow slots.

14. Downmilling is easily used on flexible, thin and flat jobs.
a) true
b) false
Answer: a
Clarification: There is no clamping issue in downmilling. Use of cutting fluid is easy. Job and tool movements are in same direction. Due to this and many other advantages, downmilling is easily used on flexible, thin and flat jobs.

Machine Tools Multiple Choice Questions on “Tailstock”.

1. Which of the following is not true regarding tailstock?
a) tailstock is also known as loose headstock
b) it is a fixed unit on the bed ways
c) it provides support to the other end of the work when it is being machined
d) none of the mentioned
Answer: b
Clarification: The all above mentioned statements are correct except one which says that it is a fixed unit on the bed ways. Actually, it is a sliding unit on the bed ways

2. For performing which kind of operations, it ( tailstock ) holds a tool?
a) drilling
b) reaming
c) tapping
d) all of the mentioned
Answer: d
Clarification: Tail stock holds a tool for performing operations such as drilling, reaming, tapping etc. To accommodate different lengths of work, the body of the tailstock can be adjusted along the ways chiefly by sliding it to the desired position.

3. The body of the tailstock can be adjusted by clamping with the help of_____
a) bolts
b) plates
c) bolts and plates both
d) none of the mentioned
Answer: c
Clarification: The body of the tailstock can be adjusted by clamping with the help of bolts and plates to adjust with job’s dimensions. The body of tailstock is situated on the right hand side of the lathe bed.

4. The upper casting of the body can be moved_____ from the operator.
a) toward
b) away
c) toward or away both
d) none of the mentioned
Answer: c
Clarification: The upper casting of the body can be moved toward or away from the operator. This movement is done with the help of setover screw to offset the tailstock for taper turning and to realign the tailstock centers for straight turning.

5. Which of the following is not the part of spindle?
a) dead center
b) hand wheel
c) setover screw
d) none of the mentioned
Answer: d
Clarification: All above mentioned are the parts of spindle. In tailstock, the spindle holds dead center. In headstock, the spindle is able to hold live center.

6. Offset of tailstock is done for_____
a) taper turning
b) straight turning
c) both turning of taper type and straight type
d) none of the mentioned
Answer: a
Clarification: Offset is done for the purpose of taper turning. Taper is a shape in which the diameter of the both ends are different.

7. Realign of tailstock center is done for_____
a) taper turning
b) straight turning
c) taper turning and straight turning
d) none of the mentioned
Answer: b
Clarification: Realign is done for the purpose of straight turning. The body is bored to act as the barrel which carries the tailstock spindle that moves in and out of the barrel by means of a screw when the tailstock hand wheel is turned.

8. Which type of rotation of the hand wheel causes the spindle
to be drawn inward?
a) clockwise
b) anticlockwise
c) either anticlockwise or clockwise
d) none of the mentioned
Answer: b
Clarification: Anticlockwise rotation of the hand wheel causes the spindle to be drawn inward. This spindle has a keyway in the underside which mates with a small key fitted on the barrel to prevent rotation.

9. The front of the spindle has a taper hole.
a) true
b) false
Answer: a
Clarification: The front of the spindle has a taper hole into which the dead centre or other tools fit.

10. Anticlockwise rotation of the hand wheel causes the spindle to advance.
a) true
b) false
Answer: b
Clarification: This is false. Clockwise rotation of the hand wheel causes the spindle to advance. Due to this clockwise and anticlockwise movement, the end of the screw strikes the back of the dead center or any tool that is fitted into the hole.

Machine Tools Multiple Choice Questions on “Lathe : Steady Rests and Its Types-2”.

1. Which portion of the bed is hinged at the back in fixed steady rest?
a) top
b) middle
c) bottom
d) none of the mentioned
Answer: a
Clarification: The top portion of the bed is hinged at the back to permit the top to be lifted or assembled to the bottom half.

2. In fixed steady rest, a fixed steady can be clamped_____
a) parallel to lathe bed
b) perpendicular to lathe bed
c) at any desired position on the lathe bed
d) none of the mentioned
Answer: c
Clarification: A fixed steady can be clamped at any desired position on the lathe bed. This is done with the help of base clamping screw.

3. In fixed steady rests, these rests are fixed at some intermediate points to prevent bending of work pieces due to_____
a) own weight
b) chattering forces
c) own weight and chattering forces both
d) none of the mentioned
Answer: a
Clarification: These rests are fixed at some intermediate points to prevent bending of work pieces due to their own weight. This rests help in achieving greater accuracy in machining and permit heavier cuts.

4. Which of the following is not true for fixed steady rest?
a) the three pads or jaws are adjusted on a trued cylindrical face of the work piece
b) a fixed steady can be clamped by the base clamping screw
c) pads are also known as jaws
d) none of the mentioned
Answer: d
Clarification: The all above mentioned are true. Jaws can also be termed as pads and also a fixed steady rest can be clamped by base clamping screws.

5. Which of the following is also known as the travelling steady?
a) fixed steady rest
b) follower steady rest
c) fixed steady rest and follower steady rest both
d) none of the mentioned
Answer: b
Clarification: Follower steady rest is also termed as travelling steady. Adjustable screw, bearing pads, frame, lock nut etc. are the main parts of this machine.

6. Follower steady rest consists of_____ like frame.
a) D
b) C
c) S
d) None of the mentioned
Answer: b
Clarification: Follower steady rest consists of ‘C’ like frame. These type of rest is used in finish turning operations or where the entire length of the workpiece is to be turned at a stretch, without disturbing the setting.

7. How many adjustable pads does follower steady rest has?
a) 1
b) 2
c) 3
d) 4
Answer: b
Clarification: Follower steady rest has 2 adjustable pads. These pads are helpful for supporting the work.

8. In follower steady rest, there is a pad which is located_____ the cutting tool.
a) in front of
b) opposite to
c) besides
d) none of the mentioned
Answer: b
Clarification: The pad is located opposite to the cutting tool and the other pad bears the top of the workpiece to prevent from spinning up due to the thrust of the load.

9. In follower steady rest, the work piece is machined slightly wider
than the jaws.
a) true
b) false
Answer: a
Clarification: The piece of work is machined slightly wider than jaws to provide bearing surface. For this, the machine surface is brought under the jaws and the tool is set slightly in advanced position than the jaws.

10. Which type feed is provided in follower steady rest?
a) longitudinal
b) cross
c) both cross and longitudinal
d) none of the mentioned
Answer: a
Clarification: The tool is fed longitudinally in follower steady rest and the jaws follow the tool giving support where cutting actually take place..

11. Which of the following is not true for steady follower rest?
a) it is used in finish turning operation
b) it is used where the entire length of the work piece is to be turned at a stretch, without disturbing the setting
c) the support is discontinuous to the entire length of cutting
d) none of the mentioned
Answer: d
Clarification: All above sentences are true except the sentence which says that support is discontinuous to the entire length of cutting.The support is continuous to the entire length of cutting.

Machine Tools Multiple Choice Questions on “Hand Drilling and Gang Drilling”.

1. Which of the following machine is portable?
a) hand drill
b) none of mentioned
c) pillar drill
d) column drill
Answer: a
Clarification: Pillar drill and column drill are heavy enough to carry. Hand drill can be driven by hand.

2. Size of hand drill is relatively ______
a) small
b) medium
c) large
d) very large
Answer: a
Clarification: Size of hand drill is relatively small. It is so small that man can hold it in his hand.

3. In hand drill, force on the spindle is_____
a) less
b) more
c) can’t say anything
d) none of the mentioned
Answer: a
Clarification: Generally, force on the spindle is less in this machine as this machine has to be carried by hand-manually. So smaller the force, more easier it to carry in hand.

4. In hand drill, spindle is rotated by aerator system.
a) true
b) false
Answer: a
Clarification: Hand drill is such a small that it can be hold by hand and for that it should be flexible for normal use. For that, generally we provide aerator system for the rotation of the spindle.

5. If you want to make a hole in a switch board, then you will use______
a) table top drill machine
b) pillar drill machine
c) hand drill machine
d) column drill machine
Answer: c
Clarification: Hand drill machine is used for this purpose because it is portable. We can’t move switch board to the machine. Switch board is fixed. So, in order to perform drilling operation in switch board we need a portable device and for that purpose we use hand dril.

6. In which of the following drill machine, number of drills are used simultaneously?
a) table top drill machine
b) pillar drill machine
c) hand drill machine
d) gang drill machine
Answer: d
Clarification: Gang drill is used for this purpose. As the name suggest, gang drill is used for gang production means for large production and for that it uses number of drills simultaneously.

7. Which type of drilling can be done in gang drill machine?
a) progressive
b) parallel
c) both progressive and parallel
d) none of the mentioned
Answer: c
Clarification: Both types of drills can be performed in this machine as number of drills can be used simultaneously.

8. Use of a jig is necessary in gang drill.
a) true
b) false
Answer: a
Clarification: Jig is always needed. Jig provides the replica of actual task.

9. Gang drill is used for______
a) large-batch production
b) small production
c) relatively low production
d) none of the mentioned
Answer: a
Clarification: It is used for large productions because it can produce large number of holes simultaneously.

10. In which of the following, accuracy is more?
a) table top drill
b) hand drill
c) pillar drill
d) gang drill
Answer: d
Clarification: Accuracy is higher in gang drill. We use separate jig for each and every job in gang drill.

Machine Tools Multiple Choice Questions on “Drilling Operation-1”.

1. A hole is being drilled with 5 mm drill at a feed of 0.1 mm/revolution and rpm is 200. Calculate the metal removal rate (m) in mm³/minute.
a) 392.5
b) 785
c) 1570
d) none of the mentioned
Answer: a
Clarification: Here, we have the value of diameter, feed and rpm. So, from the formula, m= ( 3.14*d*d*f*n) / 4, we can easily get the value of metal removal rate.

2. If drill is 2.5 mm, feed is 0.35 mm/revolution and metal removal rate is 40 mm³/minute. Then find out the value of rpm.
a) 46.6
b) 23.3
c) 93.2
d) 11.65
Answer: b
Clarification: From the formula, m= ( 3.14*d*d*f*n) / 4. From this formula, we can easily calculate rpm. Rpm means revolution per minute.

3. If drill is 5.5 mm, metal removal rate is 65 mm³/minute and rpm is 130.Then find the value of feed in mm/revolution.
a) 0.02
b) 0.2
c) 0.04
d) 0.4
Answer: a
Clarification: Feed is the distance the drill moves into the work at each revolution of the spindle. From the formula, m= ( 3.14*d*d*f*n) / 4, we can easily calculate feed.

4. If metal removal rate is 120 mm³/minute, rpm is 105 and feed is 0.1 mm/revolution. Then find the value of drill in mm.
a) 14.6
b) 3.8
c) 7.6
d) 1.9
Answer: b
Clarification: From the formula, m= ( 3.14*d*d*f*n) / 4, we can calculate the value of drill.

5. If value of the diameter of the drill (d2) = 10mm, then find the value of the depth of cut (d1).
a) 5
b) 10
c) 20
d) none of the mentioned
Answer: a
Clarification: Value of diameter of the drill is always twice to that the value of the depth of cut. From the formula, d1= d2/2.

6. The diameter of the drill is 15 mm and rpm of drill is 5. Find the value of cutting speed in meter/minute.
a) 235.5
b) 0.2355
c) 0.075
d) 75
Answer: b
Clarification: From the formula, cs = (3.14*d*n) /1000. Cutting speed is the peripheral speed of the drill.

7. Rpm is 10 and feed per revolution (f2) is 5. Then find the value of feed per minute (f1).
a) 2
b) 4
c) 1
d) none of the mentioned
Answer: d
Clarification: Rpm = f1/f2. Here rpm=10 and f2=5. So value of f1 should be 50.

8. If depth of cut is 20 mm, then find the value of diameter of the drill.
a) 10
b) 20
c) 40
d) none of the mentioned
Answer: c
Clarification: Depth of cut=diameter/2. It is simply a distance.

9. Feed per minute (f1) is 20 and rpm (n) is 5. Then find the value of feed per revolution (f2).
a) 2
b) 4
c) 1
d) 0.5
Answer: b
Clarification: Rpm = f1/f2. Here f1=20 and n=5. So, f2 should be 4.

10. If t=2minute, n=2rpm and s=5 mm. Then find the value of l. t=machining time in minute, l=length of travel of the drill in mm, n= rpm of the drill and s=feed per revolution of the drill in mm.
a) 5
b) 10
c) 20
d) none of the mentioned
Answer: c
Clarification: From the formula, t= l / (n*s). Here t=2, n=2 and s=5. Put all these values with their units in the mentioned equation,you will easily get the answer as 20 mm.

11. If d=2, n=1 and f=2. Then find the value of m. d= diameter of drill in mm, n=rpm, f=feed per revolution in mm and m=metal removal rate in mm³/minute.
a) 3.14
b) 6.28
c) 12.56
d) none of the mentioned
Answer: b
Clarification: From the formula, m= (3.14*d*d*n*f) / 4, we can easily get the value of m. Metal removal rate means the rate at which the metal is removed during the operation.

12. If d=2, n=2 and m=3. Then find the value of f. d= diameter of drill in mm, n=rpm, f=feed per revolution in mm and m=metal removal rate in mm³/minute.
a) 0.238
b) 0.477
c) 0.119
d) none of the mentioned
Answer: b
Clarification: From the formula, m= (3.14*d*d*n*f) / 4, we can easily get the value of feed. Feed may also be expressed as feet per minute or mm/minute.

13. If m=5, n=2 and f=3. Then find the value of m. d= diameter of drill in mm, n=rpm, f=feed per revolution in mm and m=metal removal rate in mm³/minute.
a) 1.03
b) 1.065
c) 0.266
d) none of the mentioned
Answer: b
Clarification: From the formula, m= (3.14*d*d*n*f) / 4, we can easily find the value of m.

14. If cs=0.942 and d=60, then find the value of n. d=diameter of drill in mm, n=rpm and cs=cutting speed in mm/minute.
a) 15.7
b) 15700
c) 5
d) 5000
Answer: c
Clarification: From the formula, cs = (3.14*d*n) /1000, we can easily find value of n. N means rpm-revolution per minute. It is an important term in any operation.

Machine Tools Multiple Choice Questions on “Column and Knee Type Milling Machine”.

1. In horizontal type universal column and knee type of milling machine, the table is placed on the knee-casting which in turn is mounted on the _____ slides of the main column.
a) horizontal
b) vertical
c) 45 degree inclined to both plans
d) none of the mentioned
Answer: b
Clarification: As per the construction of this machine. This is true for horizontal type machine. In plain and vertical type machine arrangement may be different.

2. The knee is ______ adjustable on the column in horizontal column and knee type milling machine.
a) horizontally
b) vertically
c) can’t say anything
d) none of the mentioned
Answer: b
Clarification: The knee is vertically adjustable on the column in horizontal machine so that table can move in vertical direction.

3. In this machine, the table can be moved ______
a) only up
b) only down
c) both up and down
d) none of the mentioned
Answer: c
Clarification: The table can be moved up and down to accommodate work of various heights.

4. In this horizontal column and knee type machine, cutter rotates about _____ axis.
a) horizontal
b) vertical
c) 45 degree inclined to both plans
d) none of the mentioned
Answer: a
Clarification: In this machine, cutter rotates about horizontal axis that’s the reason why it is known as horizontal column and knee type machine.

5. The column and knee type milling machines are classified according to_______
a) various methods of supplying power to table
b) different movements of table
c) different axis of rotation of spindle
d) all of the mentioned
Answer: d
Clarification: As per the classification of this machine, these are the aspects in which machine can be classified. These machines are mostly used in workshop.

6. In a universal milling machine, table of the machine may be swiveled about a vertical axis, which helps in _____ milling.
a) helical
b) cam
c) both helical and cam
d) none of the mentioned
Answer: c
Clarification: It helps in helical milling, cam milling and several other milling. This universal milling is also suitable drilling and tapping.

7. Which of following part of these machines is swivel base?
a) top
b) bottom
c) middle
d) none of the mentioned
Answer: c
Clarification: As per the construction of this machine, bottom part is swivel base on which stands the column.

8. Which part of this machine has transverse motion?
a) top
b) bottom
c) middle
d) none of the mentioned
Answer: b
Clarification: As per the construction of this machine,bottom parts has traverse motion. Bottom part can be moved toward or away from the column.

9. Which part of this machine has longitudinal motion?
a) top
b) bottom
c) middle
d) none of the mentioned
Answer: a
Clarification: The top part of this machine has longitudinal motion in the guideways machined in the swivel base.

10. Guideways are machined on the _____ of the knee.
a) top
b) middle
c) bottom
d) none of mentioned
Answer: a
Clarification: Guide ways are machined on the top of the knee. Guideways means a track or path along with something moves.

11. Which of the following part of machine is a cross slide?
a) top
b) middle
c) bottom
d) none of mentioned
Answer: c
Clarification: Bottom part of machine is a cross slide. This part can move towards or away from the column.

12. The top part of this machine is mounted on the swivel base.
a) true
b) false
Answer: a
Clarification: The top part of the machine means actual table and this table is located on the swivel base.

13. The cutter is mounted on the arbor.
a) true
b) false
Answer: a
Clarification: The cutter is mounted on the arbor with the purpose of fitting it into the spindle of the mechanism.

14. The knee is capable of being moved up and down over the guideways formed at the _____ of the column.
a) front
b) back
c) can’t say anything
d) none of the mentioned
Answer: a
Clarification: The knee is capable of being moved up and down over the guideways formed at the front of the column.This motion helps in accommodating jobs of varying heights and also giving depth of cut.

15. The machine consists of a light base on which stands the column.
a) true
b) false
Answer: b
Clarification: The machine consists of a rigid base on which stands the column. The column houses the drive motor and speed mechanism in addition to providing support for spindle and spindle bearings.