# Machine Tools Questions and Answers – Lathe : Chucks and Its Types – 2

This set of Machine Tools Multiple Choice Questions & Answers (MCQs) focuses on “Lathe : Chucks and Its Types-2”.

1. Generally, which type of work piece is hold in chucks?
a) of short length and small diameter
b) of large length and small diameter
c) of short length and large diameter
d) of large length and large diameter

Explanation: A chuck is one of the most important devices for holding and rotating a work piece in a lathe. Generally, workpiece of short length and large diameters are held in chucks.

2. The majority of three jaw chucks have three set of jaws.
a) true
b) false

Explanation: The above sentence is wrong. The majority of the three jaw chucks have two sets of jaws.

3. Which type of diameters does three jaw chuck hold?
a) internal diameter
b) external diameter
c) internal and external diameter both
d) none of the mentioned

Explanation: Three jaw chuck can hold both type of diameters : internal and external. Only perfect round work or work with equally spaced flats, divisile by three should be held in a 3 jaw chuck.

4. Which of the following is not the type of lathe chuck?
a) combination chuck
b) magnetic chuck
c) air chuck
d) none of the mentioned

Explanation: All are types of chucks. The all types of chucks are mentioned below.
1. four jaw chuck
2. three jaw chuck
3. two jaw chuck
4. combination chuck
5. collet chuck
6. magnetic chuck
7. drill chuck
8. hydraulically operated chuck

5. Which type of job, does the scroll perform in three jaw chuck?
a) only clamps a component in place
b) locates the component
c) clamps a component in place and locates the component
d) none of the mentioned

Explanation: Scroll does both jobs. The scroll not only clamps a component in place but also locates the component.This is fundamentally a practice since any wear in the scroll and/or the jaw impairs the accuracy of location.
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6. Three jaw chuck is reversible.
a) true
b) false

Explanation: This is false. Three jaw chucks is irreversible.

7. Which of the following is not the part of four jaw chuck?
a) body
b) shaft chunk key
c) pinion
d) all of the mentioned

Explanation: Body and shaft chunk key are the parts of three jaw chuck but pinion is not the part of three jaw chuck. Pinion is the part of three jaw chuck.

8. Which of the following is not the part of three jaw chuck?
a) chuck key
b) crown wheel
c) back plate
d) none of the mentioned

Explanation: All are part of three jaw chuck. Chuck key, crown wheel and back plate are the important part of the three jaw chuck. In three jaw chuck, separate internal ans external jaws have to be used.

9. Two jaw chuck can be used as a turning mixture.
a) true
b) false

Explanation: As the chuck is designed with two jaws, it can be used as a turning mixture. Both jaws are adjustable and can be operted independently.

10. In combination chuck, jaws may be adjusted as_____
a) independently
b) together
c) either independently or together
d) none of the mentioned

Explanation: In combination chuck, both types of arrangements are possible. Combination chuck is normally a four jaw chuck.

11. Which of the following pair is correct regarding to the arrangement of the jaw?
a) four jaw – independent
b) three jaw – self centric
c) two jaw chuck – independent
d) all of the mentioned

Explanation: All are correct regarding the arrangement of the jaw. Both four jaw and two jaw chucks are independent chucks, while three jaw chuck is self centering chuck.

12. Which type of chuck is used in places where duplicate
work piece are to be machined?
a) four jaw chuck
b) three jaw chuck
c) two jaw chuck
d) combination chuck

Explanation: Combination chuck is used in places where duplicate workpieces are to be machined. One piece is accurately set as done in four jaw chuck and subsequent jobs are held by operating the centering arrangement.

13. Which of the following is not true regarding three jaw chuck?
a) if we rotate any one of three pinions, it may meshes with the teeth
b) the scroll disc, which has a spiral groove cut on the bottom face meshes with the teeth on the jaws
c) all these three jaws may be made to move simultaneously
d) none of the mentioned

Explanation: The scroll disc having a spiral groove cut on the top face meshes with the teeth on the jaws.

14. Which of the following is not true?
a) jobs are held by operating the centering arrangement In combination type of chuck
b) jaws may be specially machined to hold a particular type of job in two jaw chuck
c) only one jaw may be operated concentric to the centre in two jaw chuck
d) none of the mentioned

Explanation: All are true except the one which says that only one jaw may be operated concentric to the centre in two jaw chuck. Actually, both jaws may be operated concentric to the centre in the two jaw chuck.

15. Which of the following is not true regarding two jaw concentric chuck?
a) the feature related to construction of this type of chuck are similar to those three jaw and four jaw chuck
b) both types of jaws are adjustable
c) both types of jaws may not be operated independently
d) none of the mentioned

Explanation: All the mentioned sentences are true except the one which says that both types of jaws may not be operated independently. Actually, both jaws can be operated independently.

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