Machine Tools Multiple Choice Questions on “Lathe : Cone Pulley drive”.
1. Which of the following are the advantages of cone pulley drive?
a) easy to maintain
b) can take up heavy load
c) positive drive when the back gear is in engagement.
d) all of the mentioned
Answer: d
Clarification: These all are the advantages of the cone pulley drive. It is stepped pulley mounted on the main spindle which is free to revolve.
2. Number of spindle speeds is limited to the number of steps
in the cone pulley drive.
a) true
b) false
Answer: a
Clarification: It can be easily seen from the definition of cone pulley drive. This cone pulley gets the drive from the main motor.
3. What does happen during the overload in the cone?
a) number of steps in cone pulley increases
b) belt slips off
c) nothing happens
d) none of the mentioned
Answer: b
Clarification: During the overload in the cone, the belt slips off so that no major damage happens to the lathe.
4. It doesn’t take time to change spindle speeds.
a) true
b) false
Answer: b
Clarification: This is false. In practical work, it takes time to change the spindle speed.
5. Cone pulley drive without back gear arrangement means_____
a) back gear in
b) back gear out
c) back gear neutral
d) none of the mentioned
Answer: b
Clarification: It can be easily seen from the definition of the back gear. The headstock having cone pulley drive is known as cone pulley headstock.
6. Cone pulley drive with back gear arrangement means_____
a) back gear in
b) back gear out
c) back gear neutral
d) none of the mentioned
Answer: a
Clarification: It can be easily seen from the definition of the back gear. The axis of this back gear shaft is parallel to the axis of the main spindle.
7. Which of the following mounted on the bush bearing?
a) speed motor
b) spindle
c) both spindle and speed motor
d) none of the mentioned
Answer: b
Clarification: As per the construction of lathe, spindle is fitted on the bush bearing. It is mounted in the headstock casting and a gear wheel called bull gear is keyed to it.
8. Stepped pulley mounted on the main spindle is fixed.
a) true
b) false
Answer: b
Clarification: This is false. Stepped pulley is free to revolve.
9. The back gear unit has a shaft, which carries _____
a) a gear
b) a pinion
c) a gear and a pinion both
d) none of the mentioned
Answer: c
Clarification: The back gear unit has a shaft, which carries a gear and a pinion. The number of teeth of the gear and a pinion on the back gear shaft corresponds to the number of teeth on the bull gear and the pinion on the cone pulley.
10. The axis of the back gear is_____ to the axis of the main spindle.
a) parallel
b) perpendicular
c) at any angle other than 0 and 90
d) none of the mentioned
Answer: a
Clarification: The axis of the back gear is parallel to the axis of the main spindle and the back gear is bought in engagement or disengagement with the cone pulley system by means of a lever.
11. A three-stepped cone pulley headstock provides three direct ranges of speeds.
a) true
b) false
Answer: a
Clarification: This is true. A three-stepped cone pulley headstock provides three direct ranges of speeds through the belt connection and with the back gear in engagement, three further ranges of reused speeds can be obtained.