Session 1: Handling and Usage of Direct and Indirect Measuring Instruments
Unit 4: Measuring Equipment
Textual Question-Answers
Check Your Progress
A. Fill in the blanks
1. A ………….. is assigning a value to length, mass and time withthe help of others.
Ans: measurement
2. The measuring instruments, which do not require the help ofother …………… for measuring, are called ………….. measuringinstruments.
Ans: instruments, direct
3. Steel scale or rule is the ……………. measuring tool.
Ans: simplest
4. The vernier caliper is a …………… tool used to measure ……….. and external distances accurately.
Ans: precision, internal
5. In the vernier calliper the sliding jaw containing the ………………scale, moves over the main scale.
Ans: vernier
6. For measuring the depth of …………….. recesses and……………. from a plane surface to a projection, the vernier depthgauge is employed.
Ans: blind, height
7. The micrometer is a precision measuring instrument, used byengineers and technicians for …………… and measuring the distancebetween two …………..
Ans: measuring thickness, surfaces
8. The digital micrometer shows the ……………… reading.
Ans: direct
B. Multiple choice questions
1. Direct measuring instruments have a line, which is divided inequal parts, called……………..
(a) graduated scale
(b) firm joint calipers
(c) spring joint meter
(d) All of the above
Ans: (a) graduated scale
2. Which measuring instrument is used to measure internal andexternal distances precisely?
(a) Vernier caliper
(b) Spring joint meter
(c) Micrometer
(d) None of the above
Ans: (a) Vernier caliper
3. The least count or the smallest reading which we get with thevernier caliper is calculated as……………….
(a) 0.01 cm
(b) 0.001 m
(c) 0.0001 cm
(d) None of the above
Ans: (a) 0.01 cm
4. Digital calipers are made of……………..
(a) stainless steel
(b) iron
(c) copper
(d) aluminium
Ans: (a) stainless steel
5. Which devices are used for comparing measurements againstknown dimensions?
(a) Firm joint calipers
(b) Spring joint callipers
(c) Micrometer
(d) None of the above
Ans: (a) Firm joint calipers
C. Answer the following questions
1. Give the importance of measuring instruments.
Ans: Measuring instruments are important to ensure accuracy, quality, and interchangeability of parts. They help in maintaining proper dimensions, reducing errors, and ensuring safety in automotive and mechanical work.
2. What is the difference between direct and indirect measuringinstruments?
Ans: Direct measuring instruments give readings directly on a scale, whereas indirect measuring instruments compare the size of an object with aknown standard.
3. Explain the procedure for determining the least count of verniercaliper.
Ans: The least count of a vernier caliper is obtained by dividing the valueof one main scale division by the number of divisions on the vernier scale.
4. How do you determine the least count of micrometer?Ans: The least count of a micrometer is calculated by dividing the pitchof the screw by the number of divisions on the circular scale.
5. How do we measure using indirect measuring instruments?Ans: Indirect measuring instruments are used by comparing the workpiecesize with a standard size and then measuring the difference using a scale ormicrometer.
6. Differentiate between a vernier and a digital caliper.
Ans: A vernier caliper uses a main scale and vernier scale to take readings, whereas a digital caliper displays the measurement directly on a digital screen.
7. Which parameters can be measured with a vernier depth gauge?
Ans: Depth of holes, recesses, slots, and distance from a plane surface toa projection can be measured using a vernier depth gauge.
8. What are the various alert signs found in the dashboard of avehicle?
Ans: Oil pressure warning, battery warning, engine temperature warning, brake warning, fuel warning, and check engine light.
9. Take any object, round or square. Measure and write the readingwith the help of a vernier caliper in the table given below.
Ans: Try yourself
