Engineering Metrology Mcqs

Q:

Which of the following is true for uses of comparators?

A) Can’t be used in mass production B) Not suitable for inspection purposes
C) Can be used as working gauge D) Slow rate of working
 
Answer & Explanation Answer: C) Can be used as working gauge

Explanation: Comparators are used in mass production where components are checked at a fast rate. These can be used as inspection purposes, laboratory standards and working standards or gauges.

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2745
Q:

What is the advantage of mechanical comparator over others?

A) Less moving parts B) No need of external supply
C) No error due to parallax D) Large range of instrument
 
Answer & Explanation Answer: B) No need of external supply

Explanation: Mechanical comparator is cheaper as compared to others. Mechanical comparators have more moving parts due to this friction is more and accuracy is less. External supply is not required. Moving pointer moves over a fixed scale hence error due to parallax is possible.

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1305
Q:

Which principle is related to Gauge design?

A) Rankin principle B) Position principle
C) Taylor’s principle D) Carnot Principle
 
Answer & Explanation Answer: C) Taylor’s principle

Explanation: According to Taylor’s principle, “‘No Go’ and ‘Go’ gauges are designed to check the minimum and maximum material limits”. In gauge design, simplicity is the main aim as simple gauge can take measurements accurately and continuously.

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1191
Q:

What is the use of bleed valve in flow type pneumatic comparator?

A) Zero adjustment B) Measurement of size
C) Connect passage of air from plastic tube to gauging head D) Used with pressure reducing unit
 
Answer & Explanation Answer: A) Zero adjustment

Explanation: Bleed valve in pneumatic comparator is used for zero adjustment. A screw is also present at the inlet of tapered glass tube by which magnification can be changed by passing some air supply from it.

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1000
Q:

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
 
Answer & Explanation Answer: D) Assembly time increases

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.

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974
Q:

Which of the following is not correct for pneumatic comparator?

A) Independent of operator skill B) Loss of accuracy due to gauge wear
C) Speedy operation D) Total life cost is less
 
Answer & Explanation Answer: B) Loss of accuracy due to gauge wear

Explanation: In pneumatic comparator, there is no physical contact with setting gauge or part being measured. Due to this reason, there is no loss of accuracy due to gauge wear. It is an accurate, universal, reliable and speedy device.

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953
Q:

What is the difference between CMM and UMM?

A) UMM can’t inspect geometrical features while CMM does it B) CMM is more accurate than UMM but can’t inspect geometrical features
C) UMM is more accurate than CMM and can inspect geometrical features D) CMM is more accurate than UMM but can’t inspect geometrical features
 
Answer & Explanation Answer: C) UMM is more accurate than CMM and can inspect geometrical features

Explanation: Co-ordinate measuring machine doesn’t inspect the geometric features of the part but universal measuring machine does it. Co-ordinate measuring machine is less accurate than a universal measuring machine.

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875
Q:

Match the following gauge type with their respective tolerance:

A) A - 1) ±0.05 ?m
B) AA - 2) +0.15 ?m to ?0.05 ?m
C) AAA - 3) +0.25 ?m to ?0.15 ?m
D) B - 4) +0.10 ?m to ?0.05 ?m

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
 
Answer & Explanation Answer: A) A-2, B-4, C-1, D- 3

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.

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