This set of Engineering Metrology Multiple Choice Questions & Answers (MCQs) focuses on “Slip Gauges”.
1. Which of the following is not a name of slip gauges?
a) Gauge Blocks
b) Johannsen Gauges
c) Gage Blocks
d) Linear Gauges
View Answer
Explanation: Slip Gauges are also known by Gauge Blocks, Gage Blocks, Jo Blocks and Johannsen Gauges. These are the rectangular or square blocks of steel.
2. Which of the following is not a common basic form of slip gauge?
a) Rectangular
b) Square with centre hole
c) Square without centre hole
d) Parallelogram
View Answer
Explanation: There are three basic forms of slip gauges. These are rectangular, square with center hole, and square without centre hole. Rectangular blocks are less expensive hence are more widely used.
3. How many grades or classes of slip gauges are present?
a) 3
b) 5
c) 6
d) 4
View Answer
Explanation: Slip gauges can be designed in 5 grades i.e. Grade 2, Grade 1, Grade 0, Grade 00 & calibration grade.
4. What is the approximate size of slip gauges?
a) 30mm long and 10mm wide
b) 45mm long and 15mm wide
c) 20mm long and 5mm wide
d) 25mm long and 10mm wide
View Answer
Explanation: Angle gauges are about 30 mm long and 10 mm wide. Slip gauges are like a system to produce precision length.
5. Match the following gauge type with their respective tolerance:
A) A - 1) ±0.05 μm B) AA - 2) +0.15 μm to −0.05 μm C) AAA - 3) +0.25 μm to −0.15 μm D) B - 4) +0.10 μm to −0.05 μm
a) A-2, B-4, C-1, D- 3
b) A-1, B-2, C-3, D-4
c) A-4, B-3, C-2, D-1
d) A-3, B-1, C-4, D-2
View Answer
Explanation: AAA has very small tolerance and are used to establish standards. AA has low tolerance and is used in calibration of inspection blocks. A has normal tolerance and are used as tool room standards. B has large tolerance used in workshops.
6. Which of the following is not correct about protector blocks?
a) Protector blocks have letter B on its measuring face
b) They are provided with high grade sets of gauge blocks
c) These are made from Tungsten carbide
d) These are 2 mm blocks
View Answer
Explanation: Protector blocks are 2 mm block with letter P on it.
7. What is the permissible gauge error for Grade 0? (l is length of slip gauge in mm)
a) ± (0.1 + 0.002l) μm
b) ± (0.1 + 0.02l) μm
c) ± (0.2 + 0.002l) μm
d) ± (0.1 + 0.005l) μm
View Answer
Explanation: Grade 0 slip gauges have maximum permissible gauge error of ± (0.1 + 0.002l) μm. For grade I and grade II, the permissible gauge error is ± (0.2+0.005l) μm and ± (0.5+0.01l) μm.
8. Which of the following is used for manufacturing of length bars?
a) Hardened steel
b) High carbon high chromium steel
c) Tungsten carbide
d) Ceramic
View Answer
Explanation: Length bars are made from high carbon high chromium steel ensuring the hardness to 64RC.
9. Why ceramic slip gauges is better than steel slip gauges?
a) Due to its wringing capability
b) Due to its Resistance to impact
c) Due to its Resistance to wear
d) Due to its thermal Expansion
View Answer
Explanation: Ceramic slip gauges are about 10 times more resistant to wear as compared to steel slip gauges. Natural stability and durability due to its low friction co-efficient make it more resistant.
10. Which of the option is correct for given statements about slip gauges error?
Statement 1: Squareness Error is the amount by which side face deviates from a right angled position with respect to each measuring face.
Statement 2: Wringing occurs due to molecular adhesion.
a) Only statement 1 is true
b) Only statement 2 is true
c) Both the statements are true
d) Both the statements are not true
View Answer
Explanation: Wringing is the complete contact between measuring faces. It occurs due to molecular adhesion.
11. Which one of the following is not a recommended set gauge of a metric unit?
a) M112
b) M105
c) M95
d) M33
View Answer
Explanation: The recommended sets of slip gauges of metric units are M112, M105, M87, M50, M33 and M27.
12. If properly wrung how much pull can two gauge blocks can withstand?
a) 400N
b) 330N
c) 250N
d) 1000N
View Answer
Explanation: Due to their ultraflat surface, gauge block adhere tightly when wrung. They can withstand 330N pull when wrung properly.
13. Which of the option is correct for given statements about slip gauge form?
Statement 1: Grade 2 is the workshop grade.
Statement 2: Square slip gauge is more expensive and adhere better to each other when wrung
a) Only statement 1 is true
b) Only statement 2 is true
c) Both the statements are true
d) Both the statements are not true
View Answer
Explanation: Grade 2 is the workshop grade. They are used in setting up machine tools, checking mechanical widths etc. Square slip gauge is expensive but they wear longer and adhere better.
14. Which of the following is not the most important feature of slip gauge?
a) Length between measuring surface
b) Flatness
c) Surface conditions of measuring surface
d) Adhereness efficiency
View Answer
Explanation: The most important features of slip gauge are flatness, the length between measuring surface and surface conditions of measuring surface. Slip gauges are used to provide end standards of specific length.
15. In absence of parallelism, what is the size of slip gauge?
a) Distance between two measuring faces
b) Distance between the centre of the exposed face to the surface of a body
c) Distance between the top edge of the exposed surface and same edge of a body
d) Distance between contacting part of gauge and body
View Answer
Explanation: Size of slip gauge in absence of parallelism is the vertical distance between centre of exposed face and surface of a body.
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