Machine Tools Questions and Answers – Lathe : Taper and Taper Turning

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This set of Machine Tools and Machining Questions and Answers for experienced focuses on “Lathe : Taper and Taper Turning”.

1. A taper may be defined as a uniform gradual_____ along the length of the job.
a) increase
b) decrease
c) increase or decrease
d) none of the mentioned

Explanation: A taper may be defined as a uniform gradual increase or decrease along the length of the job. Taper turning can be measured by from tool method, tailstock offset method, compound slide method and so on.

2. The taper is measured in terms of radius along the length of the job.
a) true
b) false

Explanation: This is false. The taper is measured in terms of diameter along the length of job.

3. In a lathe, taper turning means to produce a_____ surface by gradually decreasing the value of diameter from a cylindrical work piece.
a) conical surface
b) flat surface
c) both conical and flat surface
d) none of the mentioned

Explanation: Taper turning means to produce a conical surface by gradually decreasing the value of diameter from a cylindrical work piece lathe. Two types of tapers are there: internal and external taper.
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4. Which of the following is not true for taper turning?
a) taper turning is one type of lathe operation
b) the amount of taper is specified by the ratio of its length to the difference in the diameter of the taper
c) amount of taper is designated by the letter K
d) none of the mentioned

Explanation: All the sentences are true except the sentence which says that the amount of taper is specified by the ratio of its length to the difference in the diameter of the taper. The amount of taper is specified by the ratio of difference in the diameters of the taper to its length.

5. Amount of taper in a work piece is termed as conicity.
a) true
b) false

Explanation: It can be easily understood by the definition of taper. For taper or conicity feed is provided. Two types of feeds are there: manual feed and power feed.

6. The SI unit of taper is_____
a) meter
b) centimeter
c) millimeter
d) none of the mentioned

Explanation: Taper is ratio of same quantity. It is unitless.

7. Full taper angle is also known as angle of taper.
a) true
b) false

Explanation: This is false. Half taper angle is also known as angle of taper.

8. Which of the following is the right formula for taper?
a) K= (D-d) / L
b) K= L / (D-d)
c) K= D/ L
d) none of the mentioned

Explanation: K= (D-d) / L – It is the basic formula used for calculating taper. Here k=taper, D and d are diameters and l is length.

9. Find the value of K. D= 90 mm, d=80 mm, L=1cm.
a) 1
b) 10
c) 100
d) none of the mentioned

Explanation: 1 cm = 10 mm. From the formula K= (D-d)/L, K can be easily calculated.

10. Find the value of d. K=1/10, L= 10 cm, D=65 mm.
a) 45 mm
b) 55 cm
c) 75 mm
d) none of the mentioned

Explanation: Answer should be 55 mm. It can be easily calculated from the formula K= (D-d)/L.

11.The mentioned figure indicates_____ a) knurling
b) parting off
c) taper turning
d) none of the mentioned

Explanation: As per the definition of the taper turning. Taper is a shape in which diameters of the both ends are different. It can be easily seen from this figure.

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