Engineering Metrology Questions and Answers – Feeler Gauges

This set of Engineering Metrology Multiple Choice Questions & Answers (MCQs) focuses on “Feeler Gauges”.

1. What is the use of feeler gauge?
a) To find the thickness of work piece
b) To measure the gap width
c) To check straightness
d) To check flatness

Explanation: Feeler gauges are used to measure gap width between two parallel faces e.g. finding clearance between two parallel surfaces.

2. What is the tensile strength of blade of feeler gauge with thickness up to 0.5 mm?
a) 170 kgf/mm2
b) 270 kgf/mm2
c) 50 kgf/mm2
d) 70 kgf/mm2

Explanation: The blades of feeler gauges are made of heat treated tool steel. For thickness up to 0.5 mm, the tensile strength of blades is 170 kgf/mm2 and for 0.5 mm or above thickness it is 70 kgf/mm2.

3. Which of the following is incorrect about feeler gauge?
a) Feeler gauge can be used to check spark plug gaps
b) A Feeler gauge has number of blades of equal thickness
c) Blades are hinged in a sheath

Explanation: A feeler gauge is used to check gaps and clearance between two surfaces like spark plugs and tappet clearance. A feeler gauge has a number of blades of different grades and thicknesses. For maximum protection, blades are assembled in a protective sheath.

4. How much overall length is available for feeler gauge blades?
a) 50 mm
b) 30 mm
c) 70 mm
d) 100 mm

Explanation: The overall length available for the blades is 100 mm. and thickness of blades generally varies from 0.03 to 1 mm.

5. Which if the following option is correct for given statements?
Statement 1: Feeler gauge can be used to check clearance between cylinder and piston.
Statement 2: The working of feeler gauges is completely depended on the sense of feel.
a) Statement 1 is true but statement 2 is not true
b) Statement 2 is true but statement 1 is not true
c) Both the statements are not true
d) Both the statements are true

Explanation: The feeler gauge is not forced in the gap and it should not slide freely. For a perfect working, gauge should give a ‘’gauge fit’’ type of feel.

6. Match the set number with number of blades in the set as per BIS.

```Set number                -               No. of blades
A) 2                      -                    1) 8
B) 6                      -                    2) 9
C) 3                      -                    3) 11
D) 1                      -                    4) 16```

a) A-2, B-3, C-4, D-1
b) A-1, B-2, C-3, D-4
c) A-3, B-4, C-1, D-2
d) A-4, B-1, C-2, D-3

Explanation: 7 sets of feeler gauge are recommended by Bureau of Indian Standard. These sets are to furnish maximum utility with minimum number of blades.

7. What is the maximum variation in thickness of a feeler gauge blade of 0.3 mm thick blade?
a) 0.04
b) 0.05
c) 0.06
d) 0.07

Explanation: Maximum variation in thickness for feeler gauge blades up to the thickness of 0.03 mm including 0.03 should not exceed 0.04 mm. For blades over 0.3 mm, this variation is 0.006 mm.

8. According to BIS, What is the thickness of feeler gauge blades for set number 1?
a) 0.3 to 0.1
b) 0.03 to 0.1
c) 0.05 to 0.3
d) 0.5 to 0.3

Explanation: Set number 1 has 8 blades in the set with a thickness of blades from 0.03 to 0.1 in steps of 0.01.

9. Which of the following option is correct for given statements?
Statement 1: The series of feeler gauge blades are of thicknesses from 0.03 to 1 mm.
Statement 2: Feeler gauge blades are non-removable and are assembled in a protective sheath.
a) T, F
b) F, T
c) T, T
d) F, F

Explanation: Feeler gauge blades are hinged on a screw and nut. So, they are removable in nature. They are assembled in a protective sheath which protects the blades when they are not in use.

10. What is the width of feeler gauge blades (in mm) at heel and tip respectively?
a) 12, 6
b) 5, 11
c) 20, 15
d) 15, 25

Explanation: Blades are 6 mm wide at tip and width at the heel is 12 mm. Width is less at the tip because they are tapered for the outer part of their length.

Sanfoundry Global Education & Learning Series – Engineering Metrology.

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