Class 11 Automotive Service Technician Chapter 4 Measuring Equipment

Class 11 Automotive Service Technician Chapter 4 Measuring Equipment Solutions English Medium As Per AHSEC New Syllabus to each chapter is provided in the list so that you can easily browse through different chapters Class 11 Automotive Service Technician Chapter 4 Measuring Equipment Question Answer and select need one. Class 11 Automotive Service Technician Chapter 4 Measuring Equipment Notes Download PDF. AHSEC Class 11 Automotive Service Technician Question Answer English Medium.

Class 11 Automotive Service Technician Chapter 4 Measuring Equipment

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Also, you can read the NCERT book online in these sections Solutions by Expert Teachers as per Central Board of Secondary Education (CBSE) Book guidelines. Class 11 Automotive Service Technician Chapter 4 Measuring Equipment Textual Solutions are part of All Subject Solutions. Here we have given AHSEC Class 11 Automotive Service Technician Chapter 4 Measuring Equipment Textbook Solutions English Medium for All Chapters, You can practice these here.

Measuring Equipment

Chapter: 4

A. Fill in the blanks: 

1. A ______________ is assigning a value to length, mass and time. 

Ans: Measurement.

2. The measuring instruments, which do not require the help of other ___________ for measuring are called ________________ measuring instruments. 

Ans: Instrument, 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: Measurement, 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 depth gauge is employed. 

Ans: Holes, distance.

7. The micrometer is a precision measuring instrument, used by engineers and technicians for ___________ and measuring the distance between two ___________. 

Ans: Inspection, faces.

8. The digital micrometer the _____________ reading.

Ans: Final.

B. Multiple choice questions: 

1. Direct measuring instruments have a line, which is divided in equal 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 and external 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 the vernier 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 against known 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 used to assign values to length, mass, time, or derived units like speed, acceleration, and pressure. In the automotive industry, these instruments are essential for determining the dimensions of various objects. Precision measuring equipment, such as gauges, is vital for the repair and maintenance of automobiles. Knowing the correct measuring tool for specific automotive parts is crucial to ensure accurate measurements and adjustments.

Measuring instruments are very important in many industries and science. They help take accurate measurements and collect exact data. They ensure products are made correctly, help with research, and support decisions. By giving reliable measurements, these tools help find mistakes, avoid problems, and improve how things work. This helps in creating new ideas, keeping things safe, and making processes more efficient.

2. What is the difference between direct and indirect measuring instruments? 

Ans: The difference between direct and indirect measuring instruments are as follows:

3. Explain the procedure for determining the least count of vernier caliper.

Ans: The procedure for determining the least count of a vernier caliper is as follows:

(i) The sliding jaw is moved along the beam until it comes in contact with the object (e.g., cylinder) placed against the fixed jaw. In this way, the object is held between the fixed and sliding jaws.

(ii) The sliding jaw assembly is then clamped to the main beam with the help of a fine adjustment screw.

(iii) The knife edges of the two jaws are now in contact with the object.

(iv) The main slide assembly is then locked to the beam using the retainer to prevent any movement during the measurement.

(v) Remove the object held in the jaws for reading the measurement, or read the caliper while the object is still held between the jaws.

(vi) Read the main scale reading to the left of the zero of the vernier scale.

(vii) Read the vernier scale division that coincides with a division on the main scale.

(viii) Multiply the reading of the vernier scale with the least count and add it to the main scale reading to arrive at the final reading.

4. How do you determine the least count of micrometer?

Ans: Calculation of least count of a micrometer:

Calculation of least count of a micrometer

Least Count (L. C) = Pitch/No. of divisions on micrometer barrel (thimble) where Pitch = distance travelled by thimble on a linear scale in one rotation, which is usually 0.5 mm, unless mentioned.

For example, the number of divisions on the barrel are 50. Therefore, the least count of the micrometer will be 0.5/50 = 0.01

(i) Read the scale on the sleeve. The example shows 12 mm divisions. 

(ii) Still reading the scale on the sleeve, a further ½ mm (0.5) measurement can be seen on the bottom half of the scale. The measurement now reads 12.5mm. 

(iii) Finally, the thimble scale shows 16 full divisions (16 × 0.01 = 0.16 mm). 

The final measurement is 12.5mm + 0.16mm = 12.66 mm.

5. How do we measure using indirect measuring instruments?

Ans: The simple calipers can be used in these situations. For measuring, the object is held between the ends, the object is then removed, and the ends are placed on a steel scale to determine the distance. These calipers can be used to calculate the length, outside and inside diameters. Some of the calipers are as follows:

(i) Firm Joint Calipers: This device is used to compare measurements against known dimensions. It has two legs which are joined together by a rivet. The legs are set properly so that the working ends meet evenly and closely. The nominal sizes of joint calipers are 100 mm, 150 mm, 200 mm, and 300 mm.

(ii) Spring Joint Calipers: The functions of these calipers are similar to firm joint calipers. The legs of this caliper can be opened and closed by screwing the nut in and out of the bolt.

6. Differentiate between vernier and digital caliper.

Ans: The differences between vernier and digital caliper are as follows:

7. Which parameters can be measured with vernier depth gauge?

Ans: The parameters that can be measured with a Vernier depth gauge are the distances from a plane surface to a projection and the depth of holes. The graduated scale in this gauge slides through the base while the vernier scale remains fixed .

8. What are the various alert signs found in a dashboard of a vehicle? 

Ans: The various alert signs found on a vehicle’s dashboard include:

(i) Seat Belt Warning Light – Reminds the driver and passengers to fasten their seat belts.

(ii) Oil Can: Low oil level or oil pressure issue.

(iii) Check Engine Light: This light can indicate a wide range of issues with the engine or emissions system. 

(iv) Tire Pressure Warning Light: Indicates that one or more tires are underinflated. 

(v) Airbag Fault Indicator – Alerts the driver of a fault in the airbag (SRS) system.

(vi) Low Fuel Indicator – Warns that the fuel level is low.

(vii) Brake: Brake system issue (e.g., low brake fluid).

9. Take any object round or square. Measure and write the reading with the help of vernier caliper in the table given below.

Ans: Students do it yourself.

A. Fill in the blanks: 

1. Instruments used for measuring the angle are called ____________ measuring instruments. 

Ans: Angular.

2. A protractor is a device for measuring the angle between two ____________ lines. 

Ans: Intersecting.

3. The blade protractor has double graduations from 0–180° in ____________ directions permitting the direct reading of angles. 

Ans: Opposite.

4. A bevel gauge is a (an) ____________ gauge for setting and ____________ angles.

Ans: Adjustable, transferring.

5. The universal bevel protractor is designed for _________ measuring and __________ of angles.

Ans: Precision, layout.

B. Multiple choice questions: 

1. Instruments used for measuring angles are called _________________. 

(a) Angular measuring instruments.

(b) Gauge. 

(c) Micrometer.

(d) None of the above.

Ans: (a) Angular measuring instruments.

2. Which device is used for measuring the angle between two intersecting lines? 

(a) Protractor. 

(b) Scale. 

(c) Caliper.

(d) Screw-gauge.

Ans: (a) Protractor. 

3. Bevel or combination gauge is used to measure _______________________. 

(a) Setting and transferring angles. 

(b) Depth. 

(c) Length. 

(d) Accurate angle. 

Ans: (a) Setting and transferring angles. 

4. Which device is used for precision measuring and layout of angles? 

(a) Universal Protractor. 

(b) Combination gauge.

(c) Caliper.

(d) None of the above.

Ans: (a) Universal Protractor. 

C. Answer the following questions: 

1. Explain the importance of angular measurement and measuring instruments.

Ans: Importance of Angular Measurement and Measuring Instruments:  Angular measurement is essential in various fields, such as engineering, mechanics, and automotive service, where precise angle measurements are crucial for manufacturing and assembly processes. Accurate angle measurement ensures that parts fit correctly, which is critical for the proper functioning of vehicles and machinery.

Measuring Instruments: Angular measuring instruments, like protractors and bevel gauges, help measure angles accurately. 

They’re used for tasks like:

(i) Setting angles

(ii) Aligning parts

(iii) Adjusting components

These tools are important for precise work in industries like automotive and mechanics. They ensure things fit together correctly and work properly.

 2. What is the difference between a protractor and blade protractor?

Ans: The difference between a protractor and blade protractor are as follows:

3. Explain the procedure for using a bevel gauge.

Ans: Procedure for Using a Bevel Gauge:

A bevel gauge, also known as an adjustable gauge, is used for setting and transferring angles. It consists of a handle made from wood, plastic, or steel, attached to a metal blade. The blade is adjustable and pivots to lock at any desired angle, controlled by a thumb screw or wing nut.

Procedure:

(i) Loosen or tighten the thumb screw to adjust the angle.

(ii) Set the blade to the required angle.

(iii)The bevel gauge can be used for measuring the angle of valve faces and valve seats.

(iv) The straight edge of the bevel gauge is used to check for distortion in flat surfaces, such as the cylinder head and cylinder block.

4. How do we determine the least count of universal bevel protractor?

Ans: The least count of a universal bevel protractor is determined by dividing the number of divisions on the vernier scale by the number of divisions on the main scale.

In the case of the universal bevel protractor:

(i) The main scale measures from 0 to 90 degrees and back from 90 to 0 degrees.

(ii) The vernier scale is divided into 24 spaces, where each space on the vernier scale represents 1/12 of a degree, or 5 minutes.

The universal bevel protractor’s least count is calculated as 1/12 of a degree, equivalent to 5 minutes. This means each vernier scale division represents 5 minutes or 1/12 of a degree, enabling precise angle measurements by combining main scale degree readings with vernier scale minute readings.

A. Fill in the blanks:

1. Dial gauge is used as a measuring device to measure the accuracies 

in ____________, ____________ of the parts or components.

Ans: Alignment, eccentricity.

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: Plunger, micrometer.

4. A vernier bore gauge measures a ____________ directly. 

Ans: Bore.

5. A dial bore gauge is a special tool, which is used to accurately measure the inside _______ of a hole, cylinder or pipe and detect ________ and tapers in bores. 

Ans: Diameter, ovality.

6. Screw pitch gauges are used to check the ________ of the thread immediately. 

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 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: (a) Telescope Gauge. 

C. Answer the following questions: 

1. What is the importance of a dial indicator or gauge?

Ans: A dial gauge is like a fine watch. It consists of a graduated dial, pointer, plunger and a clamp. It measures the displacement of its plunger on a circular dial by means of a rotating pointer. It is a measuring device that measures the accuracy in alignment and eccentricity of the parts or components. Dial indicators are also great for checking crankshaft runout, crank end play, shaft thrust, gear backlash, flywheel face runout, flywheel housing concentricity, valve seat concentricity or piston deck clearance.

2. Explain the working principle of a dial gauge.

Ans: It works on the rack and pinion principle. The stem or plunger has rack teeth. A set of gears engage with the rack. The pointer is connected to a small pinion. This small pinion is independently hinged, i.e., it is not connected to the stem. The vertical movement of the stem is transmitted to the pointer through a set of gears. A spring gives a constant downward pressure to the stem.

Thus, any movement of the plunger causes a corresponding movement of the main pointer on a graduated dial. In addition to the main pointer, the dial gauge has a secondary scale and a small pointer for indicating the number of revolutions made by the main pointer. Zero setting of the main pointer of the dial gauge can be done by rotating the dial face until the ‘0’ line coincides with the pointer.

3. What is a feeler gauge?

Ans: Feeler gauges are used for checking the clearance between mating surfaces. They are mainly used in adjusting the valve clearance and setting of spark plug gaps in automobiles. They are made from 0.03 to 1.0mm thick of 100mm long leaves. The blades are pivoted in a holder. The value of thickness of the leaf is marked or engraved on it. To know or adjust the clearance or gap, the leaf of the feeler gauge is selected and inserted in the gap. The leaf should not be loose or inserted with force. The leaf should go in the gap with slight drag or resistance. The value of the clearance or gap is read from the leaf of the feeler gauge.

4. List the steps required to measure the bore of an object with the help of a dial bore gauge.

Ans: Measuring the bore size with Dial Bore Gauge:

(i) Zero the dial bore gauge against a calibrated ring of the same relative size as the bore.

(ii) Insert the head of the gauge into the bore following the tool’s operating instructions. Rock the tool back and forth gently in the bore once the gauge is inserted and standing upright.

(iii) Watch the readout on the dial face as you rock the gauge back and forth. Record the value of the largest deviation away from ‘0’ on the dial face.

(iv) Look at the reading. This is the lowest reading, which is taken when the gauge is square on the bore, and the indicator needle reverses its direction. It can be either more or less than the zero mark, and will indicate an oversized or undersized bore.

(v) Add or subtract the value of the largest deviation from the calibrated value of the bore gauge. If the gauge was zeroed at 100 mm, and the largest deviation was 0.5 mm to the right of the ‘0’ on the dial face, then the final measurement of the bore is 100.5 mm. Alternatively, if the largest deviation was 0.5 mm to the left of the ‘0’ on the dial face of a gauge calibrated to 100 mm, then the final measurement of the bore is 99.5 mm.

 5. What is a screw pitch gauge? Give its application.

Ans: Screw pitch gauges are used to check the pitch of the thread immediately. It is necessary that everyday tools should be used to pick out a desired screw. The number of flat blades with different pitches is pivoted in a holder. The pitch value is marked on each blade. To know the pitch of any thread (nut, bolt, etc.), by visual inspection, the leaf is selected and placed on the profile of the thread. If the profile of the screw pitch gauge leaf matches with the profile of the thread being inspected, the value of pitch is read from the leaf. If the profile does not match, another leaf is selected and the process repeated till the profiles match. It must be ensured that during matching, air or light should not pass through the profiles.

A. Fill in the blanks: 

1. The speedometer tells the driver about the ______________ of a vehicle. 

Ans: Speed.

2. Tachometer tells how fast engine is turning in ______ _________. 

Ans: Revolutions per minute (rpm).

3. An odometer is an instrument that informs about the ____________ travelled by a vehicle.

Ans: Distance.

4. The fuel gauge informs about the status of the ____________ of fuel in the vehicle tank. 

Ans: Amount.

5. The temperature gauge measures the temperature of an engine’s ____________. 

Ans: Coolant.

6. An automotive navigation system is a ____________ system suitable for use in automobiles.

Ans: Satellite navigation.

B. Multiple choice questions:

1. Which of these is not a component of the dashboard? 

(a) Speedometer.

(b) Tachometer.

(c) Odometer. 

(d) Chassis. 

Ans: (d) Chassis.

2. Speedometer measures the speed in _____________. 

(a) Kilometres per hour. 

(b) Centimetres per hour. 

(c) Meters per hour. 

(d) None of the above. 

Ans: (a) Kilometres per hour.

3. Which of these devices are used to show the distance travelled by a vehicle? 

(a) Tachometer. 

(b) Odometer. 

(c) Speedometer. 

(d) All of the above.

Ans: (b) Odometer.

C. Answer the following questions: 

1. What information is given by the speedometer?

Ans: The speedometer indicates the speed of a vehicle. Speed is measured in kilometers per hour. The control of the vehicle rests with the driver, therefore, the speedometer helps the driver to keep the speed in safe limit.

2. What information is given by the odometer?

Ans: An odometer is a tool that shows the distance travelled by a vehicle. The device may be electronic, mechanical, or a combination of both.

3. What is the use of a navigation system in vehicles?

Ans: It is a satellite navigation system developed for use in automobiles. This system uses a GPS navigation device to collect position data to locate the user on a road in the unit’s map database. With the help of a road database, the unit can inform about directions to other locations along roads, also present in its database. This unit can be fitted in the dashboard of a vehicle.

Parimol

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