This set of Engineering Metrology Multiple Choice Questions & Answers (MCQs) focuses on “Advantages of Dial Indicators”.

1. Which of the following is true for the use of dial indicators?
a) Skilled labour is necessary
b) Useful for quantity control in inspection room
c) Useful for quality control in inspection room
d) Considerable practice is required before use

Explanation: Ease of reading in a dial indicator is the best advantage over other conventional type gauges of linear measuring instruments, for which before the proficiency of use requires a degree of skill and considerable practice.

2. Which of the following is provided in dial gauge to raise the plunger?
a) A finger lever
b) Probe
c) Spring
d) A pointer

Explanation: The dial gauge instrument is used in such a way that plunger move sharply in either direction. So the instrument should be made so that by such movement, it will not be damaged and its accuracy and setting will not be spoiled. A knob or finger lever is provided for raising the plunger.

3. What is the relation between accuracy attained and range of travel in measurement with dial gauges?
a) Accuracy attained is directly proportional to the range of travel
b) Accuracy attained is inversely proportional to the range of travel
c) Accuracy attained is directly proportional to the square of a range of travel
d) Accuracy attained is independent to the range of travel

Explanation: When a measurement is done by using dial indicators then the accuracy achieved in measurement is inversely proportional to the range of travel in measurement. There is no need of very large range to attain high accuracy.

4. What is the range of dial indicators?
a) 1 mm
b) 5 mm
c) 7 mm
d) 10 mm

Explanation: Range of travel of dial indicator is of the order of 10 mm. On finished work, dial gauges are mostly used as comparators and a narrow range is needed to have high accuracy.

5. Which of the following is not an advantage of dial indicator?
a) Use in mass production
b) Suited for precision dimensional control
c) Specialised skilled labour helps in attain greater accuracy
d) Versatile

Explanation: Dial gauges are best suited for precision dimension control where tolerance is very little. Over a long period dial gauge instrument is capable of giving trouble-free and dependable measurements.
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6. How much operating pressure is required on a measuring head to obtain the zero reading in dial indicators?
a) 20 oz
b) 40 oz
c) 60 oz
d) 80 oz

Explanation: On a measuring head, the required operating pressure in dial gauges to obtain the zero reading is of the order of 80 oz and should remain constant over the whole range.

7. Which of the following is a problem in using dial gauges?
a) Gauge wear
b) Effect of temperature variation
c) Economy
d) Oscillation in the pointer

Explanation: Other advantages of dial gauges over conventional gauges are that it is not subjected to the gauge wear and there is no effect of temperature variation on the instrument. It is a versatile and economic instrument.

8. Which of the following option is true for the given statements about dial indicators?
Statement 1: Dial indicators can inspect dimensional variation.
Statement 2: It is not suitable to use to check out of roundness.
a) T, F
b) F, T
c) F, F
d) T, T

Explanation: Dial indicator is able to inspect dimensional variations which are very difficult to detect by conventional gauges. Type of roundness and taper can be detected with the help of roundness.

9. Which of the following is true for the advantages of dial indicators?
a) Slow speed but good adaptability
c) Positive visibility and expensive set ups
d) Use of different inspectors but inexpensive set-ups

Explanation: In addition to the speed of the dial indicator gauge, positive visibility and adaptability, economy and accuracy, place them in the category of a precision measurement instrument.

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