Engineering Metrology – Universal Measuring Machine Questions and Answers

1.  Which of the following instrument is of the highest accuracy?

  1. Digital length gauge
  2. Inside micrometer
  3. Universal measuring instrument
  4. Universal height micrometer

Answer.3. Universal Measuring instrument

Explanation:-

A universal measuring machine (UMM) is used to measure the geometric features of components. The measurement can be performed in both absolute and comparative modes, thereby providing a convenient means to carry out inspection of length and diameters of both plain and threaded work, tapers, and pitch of screw threads to a high degree of accuracy.

 

2. A universal micrometer can measure

  1. Outside micrometer
  2. Depth Micrometer
  3. Step Micrometer
  4. All of the above

Answer.4. All of the above

Explanation:-

Universal micrometer:-  It has interchangeable anvils such as flat, spherical, spline, disk, or knife edge. It is called universal because of its modular design. The micrometer fitted with the required accessories can function as an outside micrometer, a depth micrometer, a step micrometer, etc.

 

3. A universal bevel protractor is used to measure

  1. Angle
  2. Length
  3. Area
  4. Diameter

Answer.1. Angle

Explanation:-

  • A universal bevel protractor is an instrument that has a mechanism that enables easy measurement and retention of a reading.
  • It is an angular measuring instrument capable of measuring angles to within 5 min
  • The name universal refers to the capacity of the instrument to be adaptable to a great variety of work configurations and angular interrelations.
  • The main scale on the dial is divided into four quadrants, each measuring 90°. Each division on this scale reads 1°. The degrees are numbered from 0 to 90 on either side of the zeroth division.

 

4. What is the range of voltage fluctuations that can be taken care of by an electronic unit in a universal measuring instrument?

  1. 18% to 20%
  2. -10% to +50%
  3. -18% to +20%
  4. 10% to 50%

Answer.3. 18% to +20%

Explanation:-

Universal measuring instrument uses uninterrupted power supply is provided to the electronic unit by power supply unit. The range of voltage fluctuation is between  – 18 to +20%.

 

5. Which of the following option is true for the given statements?

Statement 1: (UMM) is used to measure the geometric features of components

Statement 2: UMM consists of a fixed head and a movable head

  1. Both statements -1 and statement – 2 are true and statement – 2 is the correct explanation of statement – 1
  2. Both statements -1 and statement – 2 are true but a statement – 2 is not the correct explanation of statement – 1
  3. Statement -1 is true and statement – 2 is false
  4. Statement -1 is false and statement – 2 is true

Answer.1. Both statements -1 and statement – 2 are true and statement – 2 is the correct explanation of statement – 1

A universal measuring machine (UMM) is used to measure the geometric features of components.

UMM consists of a fixed head and a movable head also called the measuring carriage. The part to be inspected is mounted on the clamping device. The spindle centers, which are fitted with sleeves of hardened steel, ensure accurate centering of various tools such as the locating microscope, feller microscope, goniometer microscope, spotting tool, and locating indicator.

 

6. Universal measuring instrument used to calibrate

  1. Plug gauge
  2. Ring gauge
  3. Snap gauge
  4. All of the above

Answer.5. All of the above

Explanation:-

UMM-Measuring machine used to quantify – Inside, outside dimensions (length, diameter, center distance, etc.) – Angles Threads (inside and outside) Can check hard and soft materials. It can calibrate all types of standards including plug gages, ring gages, thread plug gages, thread ring gages, snap gages, depth gages, dial indicators, and more.

 

7. A universal measuring instrument can withstand up to which temperature for correct reading?

  1. 100°C
  2. 75°C
  3. 65°C
  4. 40°C

Answer.4. 40°C

Explanation

Universal measuring instrument Display unit can withstand temperature up to :10-40 °C and Operational humidity limit 30 – 80%.

 

8. The main disadvantage of a universal measuring machine is

  1. Slow
  2. Required Skill labor
  3. Both 1 and 2
  4. All of the above

Answer.3. Both 1 and 2

Explanation:-

The universal measuring machine is a very slow machine that requires a highly skilled and patient operator to use, and the accuracy built into these machines far outstripped the needs of most industries.

As a result, the universal measuring machine today is only found as a special-purpose machine in metrology laboratories. Because the machine can make comparative length measurements without moving linear axes, it is a valuable tool in comparing master gauges and length standards.

While universal measuring machines were never a mass-produced item, they are no longer available on a production basis and are produced on a to-order basis tailored to the needs of the metrology lab purchasing it.

Manufacturers that perform work that must be measured on such a machine will frequently opt to subcontract the measurement to a laboratory that specializes in such.

 

9. Which of the following option is correct for given statements about universal measuring machines?

Statement 1: The spindle of UMM has an electronic test indicator
Statement 2: The UMMs, are never interfaced with a computer

  1. Only statement 1 is true
  2. Only statement 2 is true
  3. Both the statements are true
  4. Both the statements are not true

Answer.1. Only statement 1 is true

Explanation:-

The UMMs spindle centers are fitted with sleeves of hardened steel, ensure accurate centering of various tools such as the locating microscope, feller microscope, goniometer microscope, spotting tool, and locating indicator.

The spindle has an electronic test indicator rather than a probe. The indicator can be accurately controlled and moved across a part, either along a linear axis or radially around the spindle.

The UMMs, which are presently available in the market, is interfaced with a computer, which enables easier recording of test results and subsequent analysis. A user-friendly software interface enables the user to select the testing procedure, resolution, and type of test probe.

 

10. Which of the following is correct about the electronic display unit of the universal measuring instrument?

  1. Non-removable
  2. Sensitive to electrical interference
  3. Cast iron protection cover
  4. It is a plug-in type

Answer.2. Sensitive to electrical interference

Explanation:-

The universal measuring instrument is insensitive to electrical interference and oil film. It is easily interchangeable. There is an aluminum protection cover for an electronic display unit.

 

11. Which of the following is the feature of the universal measuring machine

  1. Can check internal and external dimensions
  2. Multi-windows mode on the screen
  3. Direct display of all measured values
  4. All of the above

Answer.4. All of the above

Explanation:-

Features of universal measuring machine

  • A large variety of accessory supports and probes allow checking of both internal and external dimensions.
  • Measuring force is assured by means of an adjustable air system that can be regulated to different pressures.
  • This system eliminates errors that could be caused by varying operator feel.
  • Computer support for acquiring. processing logging and transmitting measurement data.
  • ISO compliant printout of measurement data.
  • Generous selection of accessories.
  • Form stability through a sturdy machine base (CI or granite).
  • High resistance to wear through carbide-reinforced measuring surfaces
  • CCD camera attachment.
  • Parallelism of moving parts ± 0.001 mm.
  • Direct display of all measured values.
  • Display of minimum and maximum hold values.
  • Selection of measuring units (mm / inch).
  • Display of current measuring force in Newton (N).
  • Introduction of up to 9 preset values.
  • Multi-windows mode on the screen.
  • On-screen video help for measuring functions.
  • Display: Touchscreen Measurement in an absolute and comparative mode.

 

12. Which of the following is the specification of a Universal measuring machine

  1. Adjustable measuring force is 0-12 N
  2. Switchable Resolution
  3. Machine weight is 80-200 kg
  4. All of the above

Answer.4. All of the above

Explanation:-

Specification of Universal measuring machine

  • 100-500 mm and 0-1000 mm(X), 100 mm(Y), 150 mm travel (Z)
  • Switchable Resolution: 0.001mm, 0.0001 mm 0.00001mm (controlled temperature room)
  • Adjustable measuring force: 0-12 N
  • Displacement speed of carriage: 1.5 m/sec
  • Fine adjustment range:0-10 mm
  • Operational temperature limit:10-40 °C
  • Operational humidity limit 30 – 80%
  • Repeatability: 0.1 µm
  • Machine weight: 80-200 kg

 

13. Which of the following is not an accessory of a Universal measuring machine

  1. Dividing head Reference plugs for checking racks
  2. Locating microscope, goniometric microscope
  3. Flat table for center support
  4. User-friendly software

Answer.3. Flat table for center support

Explanation:-

  • Accessories of Universal measuring machine
  • Cast Ironwork table, glass table
  • Circular rotary table Center supports
  • Work-holding device for end measurements
  • Dividing head Reference plugs for checking racks
  • Display unit: Analog and digital dial indicator
  • Collimator for Illumination from below (to measure contour, radii, hole diameter)
  • Locating microscope, goniometric microscope (to measure angles), probes
  • Universal measuring head Single V-support, adjustable V-supports, Holder for knives
  • Attachment for measurement between transversal anvils
  • Lapping equipment.
  • User-friendly software to select testing procedure, resolution and probe type.
  • Calibrated wires for different thread pitches.
  • Special tool holder.
  • Attachment for measuring the pitch of internal threads.
  • Microscope for measuring the diameter of internal threads.
  • Thread profile heads.
  • Taper measurement attachment.

Leave a Comment

Your email address will not be published. Required fields are marked *

Scroll to Top