Session 3: Dial Indicator or Gauge and other Gauges
Unit 4: Measuring Equipment
Textual Question-Answers
Check Your Progress
A. Fill in the blanks
1. Dial gauge is used as a measuring device to measure the accuracyin ………….., ……….. of the parts or components.
Ans: alignment, run-out
2. Dial gauge works on the …………. and ……….. principle.
Ans: rack, pinion
3. A telescoping gauge is a measuring tool with spring-loaded ………. used together with a …………
Ans: plungers, micrometer
4. A vernier bore gauge measures a ………….. directly.
Ans: diameter
5. A dial bore gauge is a special tool, which is used to accuratelymeasure the inside ………….. of a hole, or pipe, and detect ………and tapers in bores.
Ans: diameter, ovality
6. Screw pitch gauges are used to check the ………….. of the threadimmediately.
Ans: pitch
7. Feeler gauges are used for checking the clearance between………… surfaces.
Ans: mating
B. Multiple choice questions
1. Which of these is not a part of a dial indicator?
(a) graduated dial
(b) pointer
(c) plunger
(d) lamp
Ans: (d) lamp
2. A dial indicator or gauge works on which principle?
(a) Rack and pinion
(b) Torque
(c) Moving
(d) Helix
Ans: (a) Rack and pinion
3. Which device is used to measure a bore’s size?
(a) Telescope Gauge
(b) Bore Gauge
(c) Comparator
(d) Micrometer
Ans: (b) Bore Gauge
C. Answer the following questions
1. What is the importance of a dial indicator or gauge?
Ans: A dial indicator is important for checking small variations indimensions, alignment, run-out, and flatness. It helps in ensuring accuracyand quality during inspection and assembly of components.
2. Explain the working principle of a dial gauge.
Ans: A dial gauge works on the rack and pinion principle. The linearmovement of the plunger is converted into rotary movement of the pointer, which shows the displacement on the graduated dial.
3. What is a feeler gauge?
Ans: A feeler gauge is a set of thin metal strips of different thicknessesused to measure small gaps or clearances between mating surfaces.
4. List the steps required to measure the bore of an object with thehelp of a dial bore gauge.
Ans: First set the dial bore gauge to zero using a standard or micrometer. Insert the gauge into the bore. Rock it slightly to find the minimum reading. Note the reading shown on the dial to determine the bore size.
5. What is a screw pitch gauge? Give its application.
Ans: A screw pitch gauge is a tool used to measure the pitch of screwthreads. It is used to identify the thread pitch of bolts, nuts, and screws quicklyin automotive and mechanical work.
