Machine Tools Questions and Answers – Lathe : Chucks and Its Types – 1

This set of Machine Tools Multiple Choice Questions & Answers (MCQs) focuses on “Lathe : Chucks and Its Types-1”.

1. Three jaw chuck is also known as _____
a) universal chuck
b) self-centering chuck
c) universal or self-centering chuck
d) none of the mentioned
View Answer

Answer: c
Explanation: Three jaw chuck is also known as universal or self centering chuck. The majority of the chucks have two sets of jaws for holding internal and external diameters.

2. A chuck is attached to_____
a) lathe spindle
b) lathe apron
c) lathe tool post
d) none of the mentioned
View Answer

Answer: a
Explanation: A chuck is attached to lathe spindle. This attachment is done with the help of bolts with the back plate. (as per the construction of the lathe.)

3. Back plate is screwed on the spindle nose.
a) true
b) false
View Answer

Answer: a
Explanation: Back plate is screwed on the spindle nose. Accurate alignment of the chuck with the lathe axis is effected by spigotting.
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4. Which type of work should be held in three jaw chuck?
a) perfectly round work
b) work with equally spaced flats
c) perfectly round work and work with equally spaced
d) none of the mentioned
View Answer

Answer: c
Explanation: Only perfectly round work or work with equally spaced flats, divisible by three should be held in a three jaw chuck.

5. Which of the following chuck is also known as hydraulic chuck?
a) combination chuck
b) drill chuck
c) none of the mentioned
d) magnetic chuck
View Answer

Answer: c
Explanation: The answer should be none of mentioned. None of above is known as hydraulic chuck. Actually, air chuck is known as hydraulic chuck.

6. Which of the following chuck is also known as dog chuck?
a) four jaw chuck
b) three jaw chuck
c) two jaw chuck
d) none of the mentioned
View Answer

Answer: a
Explanation: Dog chuck is also used for describing the four jaw chuck. Four jaw chuck is also known as independent chuck.

7. In four jaw chuck, work can be turned within_____ mm accuracy.
a) 22
b) 2.2
c) 0.022
d) 0.0022
View Answer

Answer: c
Explanation: In four jaw chuck, work can be turned within 0.022 mm accuracy.As per the theory of four jaw chuck, this chuck also provides the facility of deliberately setting the work off-centre to produce eccentric workpiece.
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8. Four jaw chuck is dependent chuck.
a) true
b) false
View Answer

Answer: b
Explanation: This is false. Four jaw chuck is independent chuck since each jaw can be adjusted independently.

9. Four jaw chuck can be constructed lightly as compare to self centering chuck.
a) true
b) false
View Answer

Answer: b
Explanation: This is false. Four jaw chuck is much more heavily constructed than self-centering chuck.
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10.Which of the following is not true regarding four jaw chuck?
a) Each jaw can be adjusted independently.
b) Movement of jaw is irreversible.
c) Movement of jaw is done by the help of square threaded screw.
d) None of the mentioned
View Answer

Answer: b
Explanation: All the sentences are true except the one which says that movement of jaw is irreversible. Actually, in this chuck, movement of jaw is reversible.

11. Which of the following is not true regarding four jaw chuck?
a) The diameter of the body specifies the size of the work.
b) Concentric circles inscribed on the chuck facilitate quick
centering of the work piece.
c) Four jaw chuck has four pairs of jaws.
d) None of the mentioned
View Answer

Answer: c
Explanation: All sentences are true except the one which says that four jaw chuck has four pairs of jaws. In fact, it has four independent jaws.

12. Which of the following is the part of the four jaw chuck?
a) back plate
b) shaft chuck key
c) screw
d) all of the mentioned
View Answer

Answer: d
Explanation: All are parts of the chuck. Apart from back plate, shaft chuck key and screw, key socket, square thread screw, thrust pad, spindle nose are also the part of the four jaw chuck.

13. In four jaw chuck, a work piece can be set to run_____ by suitable adjustment of the jaws.
a) true
b) eccentric
c) true or eccentric
d) none of the mentioned
View Answer

Answer: c
Explanation: A work piece can be set to run true or eccentric as required. In 4 jaw chuck, each works independently of the others in its own slot in a chuck body.

14. T-slots are provided on the bottom of the chuck.
a) true
b) false
View Answer

Answer: b
Explanation: This is false. T-slots are provided on the face of the chuck to accommodate T bolts.

15. T bolts are used for_____
a) clamping irregular works
b) assembling balance weights
c) both clamping irregular works and assembling balance weights
d) none of the mentioned
View Answer

Answer: c
Explanation: T bolts are used for these both clamping irregular works and assembling balance weights Concentric circles inscribed on the chuck facillitate quick centering of the workpiece. The diameter of the body specifies the size of the work.

Sanfoundry Global Education & Learning Series – Machine Tools and Machining.
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Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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