Lathe Machine MCQ Quiz Questions - Set 07 - ObjectiveBooks

# Practice Test: Question Set - 07

1. Which one of the following diameters of the workpiece should be turned before cutting external threads?
(A) Major diameter
(B) Core diameter
(C) Pitch diameter

2. A metric self-releasing taper is specified as ISO 80. The number indicates that
(A) Length of taper is 80 mm
(B) Big diameter of taper is 80 mm
(C) Small diameter of taper is 80 mm
(D) Diameter up to which the mating parts match

3. The included angle of the countersinking portion of a centre drill of type 'B' used for protecting the centre hole is
(A) 75°
(B) 90°
(C) 100°
(D) 120°

4. The Horizontal feed, cross feed and screw cutting movement in a lathe is controlled by
(B) Tailstock
(C) Cross-slide
(D) Apron

5. Which one of the following statements is suitable to get better finish by turning?
(A) Increase the speed and feed
(B) Reduce the speed and feed
(C) Increase the speed and reduce the feed
(D) Increase the feed and reduce the speed

6. While using the form tool method of taper turning
(A) Carriage is to be locked
(B) Compound rest is to be locked
(C) Top slide is to be locked
(D) Tailstock is to be locked

7. Which one of the following types of chips is found while turning cast iron?
(A) Long curly chips
(B) Segmental chips
(C) I-shaped chips
(D) Spiral chips

8. Cross-slide in a lathe moves
(A) Parallel to the axis of rotation
(B) At any angle to the axis of rotation
(C) Perpendicular to the axis of rotation
(D) Either 'A' or 'B'

9. While cutting internal threads on lathe with single point tool, the spindle speed should be
(A) Less than that for the plain turning operation
(B) More than that for the plain turning operation
(C) Equal to that for plain turning operation
(D) None of the above

10. When taper turning by using taper turning attachment, the taper turning attachment is fastened to the
(A) Bed
(B) Carriage
(C) Tailstock
(D) Cross slide

11. A spindle sleeve is to be assembled to the spindle nose to perform specific operations on a lathe. These sleeves have
(A) External and internal Morse tapers
(B) External Jarno taper and internal Morse taper
(C) External Morse taper and internal Jarno taper
(D) External and internal Jarno taper

12. While power feed is engaged when turning taper by using taper turning attachment, it is noticed that for short distance parallel turning takes place due to certain defect. Which one of the following is the cause for this defect?
(A) The positioning of the taper turning attachment is not correct
(B) The tool setting is not to the centre height
(C) Play between the sliding units
(D) Workpiece is not rigidly held

13. For cutting acme threads, the threading tool should be ground to an included angle of
(A) 30°
(B) 58°
(C) 29°
(D) 47°

14. A taper for 10 mm length is produced on a workpiece by plunge cut using a form tool. The chatter marks are seen on the taper surface even though the recommended cutting speed is used and the workpiece is held rigidly. Which one of the following is a cause?
(A) The tool material is soft
(B) The tool overhanging is more than required
(C) The carriage is not locked to the bed
(D) The automatic feed is not used

15. The taper ratio of Jarno taper is
(A) 1 in 10
(B) 1 in 15
(C) 1 in 20
(D) 1 in 25

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