Manufacturing Engineering - Set 10 - ObjectiveBooks

Manufacturing Engineering - Set 10

Practice Test: Question Set - 10

1. The factor responsible for the formation of discontinuous chips is
    (A) Low cutting speed and large rake angle
    (B) Low cutting speed and small rake angle
    (C) High cutting speed and large rake angle
    (D) High cutting speed and small rake angle

2. The hard grade grinding wheels are denoted by the letters
    (A) A to H
    (B) I to P
    (C) Q to Z
    (D) A to P

3. A fine grained grinding wheel is used to grind
    (A) Hard and brittle materials
    (B) Soft and ductile materials
    (C) Hard and ductile materials
    (D) Soft and brittle materials

4. Climb milling is chosen while machining because
    (A) The chip thickness increase gradually
    (B) It enables the cutter to dig in and start the cut
    (C) The specific power consumption is reduced
    (D) Better surface finish can be obtained

5. The tool life in case of a grinding wheel is the time
    (A) Between two successive regrinds of the wheel
    (B) Taken for the wheel to be balanced
    (C) Taken between two successive wheel dressings
    (D) Taken for a wear of 1 mm on its diameter

6. In determining the various forces on the chip, Merchant assumed that the
    (A) Cutting edge of the tool is sharp and it does not make any flank contact with the workpiece
    (B) Only continuous chip without built-up-edge is produced
    (C) Cutting velocity remains constant
    (D) All of the above

7. In a single point tool, the angle between the surface of the flank immediately below the point and a line drawn from the point perpendicular to the base, is known as
    (A) Side relief angle
    (B) End relief angle
    (C) Back rake angle
    (D) Side rake angle

8. Crater wear occurs mainly on the
    (A) Nose part, front relief face and side relief face of the cutting tool
    (B) Face of the cutting tool at a short distance from the cutting edge only
    (C) Cutting edge only
    (D) Front face only

9. A grinding wheel is said to be of _________ if it holds the abrasive grains more securely.
    (A) Soft grade
    (B) Medium grade
    (C) Hard grade
    (D) None of these

10. The grinding of long, slender shafts or bars is usually done by
    (A) In-feed grinding
    (B) Through feed grinding
    (C) End-feed grinding
    (D) Any one of these

11. Which of the following statement is correct about hot machining?
    (A) It requires less power than machining metals at room temperature.
    (B) The rate of tool wear is lower.
    (C) It is used for machining high strength and high temperature resistant materials.
    (D) All of the above

12. A bottoming tap has
    (A) Its end tapered for about three or four threads
    (B) Its end tapered for about eight or ten threads
    (C) Full threads for the whole of its length
    (D) None of the above

13. The example of snag grinding is
    (A) Trimming the surface left by spruces and risers on castings
    (B) Grinding the parting line left on castings
    (C) Removing flash on forgings
    (D) All of these

14. The saw milling is an operation of
    (A) Producing grooves around the periphery of a cylindrical or conical workpiece
    (B) Producing narrow slots or grooves on a workpiece
    (C) Reproduction of an outline of a template on a workpiece
    (D) Machining several surfaces of a workpiece simultaneously

15. In ultrasonic machining, the metal is removed by
    (A) Using abrasive slurry between the tool and work
    (B) Direct contact of tool with the work
    (C) Maintaining an electrolyte between the work and tool in a very small gap between the two
    (D) Erosion caused by rapidly recurring spark discharges between the tool and work

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