This set of Engineering Metrology Multiple Choice Questions & Answers (MCQs) focuses on “Interchangeability”.
1. Which of the following option is incorrect about interchangeability?
a) Increase output
b) Increase cost of production
c) Useful in mass production
d) Assembly time increases
View Answer
Explanation: An interchangeable part is one that can be replaced with a similar part manufactured to the same drawing. It can be used in mass production with an economic oriented approach. Assembly time decreases as mating parts are interchangeable.
2. What are the main considerations for deciding the limits of a particular part?
a) Functional requirement
b) Economics and interchangeability
c) Interchangeability and functional requirement
d) Interchangeability, functional requirement and economics
View Answer
Explanation: Functional requirements are related to the function of a component that is what is required to do. Interchangeability is for ease of replacement of part. Economics is related to the minimum cost and time.
3. For full interchangeability, what is the relation between the process capability of a machine and manufacturing tolerance of the part?
a) Process capability = Manufacturing tolerance
b) Process capability ≥ Manufacturing tolerance
c) Process capability > Manufacturing tolerance
d) Process capability ≤ Manufacturing tolerance
View Answer
Explanation: For full interchangeability, only such machines are selected for manufacturing whose process capability ≤ manufacturing tolerance. If this condition is satisfied, then the component will meet the desired tolerance and capable of mating with other.
4. Which of the following option is correct in given statements about interchangeability?
Statement 1: Standardisation is not so much of importance for interchangeability.
Statement 2: Interchangeability follows ‘normal distribution’.
a) F, T
b) T, T
c) F, F
d) T, F
View Answer
Explanation: Standardisation is important in interchangeability. It is essential to follow a common standard by all, only then interchangeability is possible. All standards used by the manufacturing unit are traceable to international standards.
5. Which of the following option is not correct for ‘full interchangeability’?
a) This type of interchangeability is not feasible sometimes
b) Requires machine which can maintain low process capability
c) Machines with very high accuracy are necessary
d) For interchangeable production, this type of interchangeability is not must
View Answer
Explanation: Full interchangeability is also known as universal interchangeability. Many times, universal interchangeability is not feasible because it requires machine capable of maintaining very high accuracy and high process capability.
6. What is the main use of automatic gauge in selective assembly?
a) Check accuracy of parts
b) Check parallelism of parts
c) Divide group of parts with some tolerance in smaller groups
d) Use to check errors in parts
View Answer
Explanation: If parts to be assembled have normal tolerance of 0.01 mm then a gauge can be divided them into 10 different groups of 0.001 mm, this gauge is known as automatic gauge. It is for selective assembly of different parts.
7. What is the correct formula to find no. of groups in selective assembly?
a) Process capability / Tolerance desired
b) Tolerance desired / Process capability
c) Tolerance desired * Process capability
d) Tolerance desired + Process capability
View Answer
Explanation: No. of groups segregated in selective assembly depends upon desired tolerance and process capability of machine. Conditions like high quality and low cost can be achieved by selective assembly technique.
8. What is a limit system?
a) Series of tolerances
b) Series of fits
c) Series of clearances
d) Series of limits
View Answer
Explanation: Limit system is a series of tolerances arranged to suit a specific range of size. By this, limits of size are selected and given to mating parts to ensure specific classes of fit.
9. Which of the following is correct for selective assembly?
a) Not suitable for industrial purposes
b) Cost increases due to automatic gauging
c) Wastage is high due to selective selection
d) This method is followed in ball and roller bearing units
View Answer
Explanation: Selective assembly technique is widely used in industries. It is followed in automobile, air craft industries and in ball and roller bearing units. Tolerances desired in these industries are very narrow.
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