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Question-1. What are the two main parts of the screw gauge?
Answer-1: The two main parts of screw gauge are: a nut and a screw.
Question-2. What is the least count of the screw gauge?
Answer-2: The least count of the screw gauge is 0.001 cm.
Question-3. What is a screw?
Answer-3: Screw is a simple machine related to inclined plane.
Question-4. What is meant by gauge?
Answer-4: The gauge means device or instrument.
Question-5. What is zero error of the screw gauge?
Answer-5: when the screw tip is in contact with the stud and the zero line of the head scale does not coincide with the reference line of the pitch scale , there is zero error.
Question-6. Define the pitch?
Answer-6: Pitch is defined as the distance between two nearest threads along the axis of the screw.
Question-7. How to determine pitch?
Answer-7: Pitch = Main scale reading revealed on rotating circular disc / Number of rotations
Question-8. When is zero-error positive?
Answer-8: Zero-error is said to be positive when the zero circular scale lies above the reference line only when the fixed and movable studs are in contact.
Question-9. How back lash error is avoided?
Answer-9: By turning the screw in one direction only.
Question-10. what is the basic functions of a ratchet?
Answer-10: Ratchet prevents the screw being pressed too hard or too soft against the object.
Question-11. Why screw guage comes in the category of precision instrument?
Answer-11: The Precision instrument are those instrument that can measure up to a fraction of a mm, e.g., vernier caliper, screw gauge and spherometer.
Question-12. Why do we take a number of observations for the diameter of a wire?
Answer-12: Even if the wire appears uniform it may not be true. So to take the average value we take a set of readings.
Question-13. What is meant by range of the screw gauge?
Answer-13: The maximum length of the main scale.
Question-14. Does the diameter of the screw depend on temperature?
Answer-14: Yes it does. Diameter increases with the increase of temperature and decreases with the decrease of temperature.
Question-15. What is the Least count? How the L.C. of a screw gauge is found?
Answer-15: Least count is the distance moved by the screw when it is rotated by one circular scale division. It is calculated by using the relation: L.C. = (Pitch of the screw / No. of circular scale divisions).
Question-16. The pitch of a screw is 1 mm and the number of divisions on the head scale is 100. What is the least
Answer-16: Least count = pitch/ No: of divisions on the head scale = 1/100 = 0.01 mm
Question-17. What is the degree of accuracy of the screw gauge?
Answer-17: Degree of accuracy = L.C. or Reading power = 0.001 cm.
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