THIRD INTERNAL TESTSUB CODE : 15ME46B TIME: 3.00-4.00 p.m.SUBJECT : Mechanical Measurements and Metrology DATE: 23-05-2017SEM : 4 MAX. MARKS:15FACULTY :

Answer all Questions (FIVE MARKS) CO’S

01.

02.

Derive the expression for measurement of effective diameter two wire method in screw threads.

OrDerive the expression for measurement of effective diameter three wire method in screw threads.

CO 1, 2

CO 1 ,2

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04.

With neat sketch explain tool makers microscope Or

With neat sketch explain gear tooth terminology

CO 4,1

CO 1

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With a neat sketch explain CRO Or

Explain with sketch laser beam in metal removal process

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CO 3

SCHEME AND SOLUTIONINTERNAL ASSISMENT III

SUBJECT: Mechanical Measurements and Metrology. SUBJECT CODE: 15ME46BFACULTY: HDN SEMESTER: IV (COMMON TO A, B)

Q.NO Solution MarksAllocated

1.

2.

3.

effective diameter two wire method in screw threads

three wire method in screw threads

Tool Makers Microscope

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Gear Tooth Terminology

CRO

laser beam in metal removal process

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FIRST INTERNAL TESTSUB CODE : 15ME46B TIME:1 Hour SUBJECT : Mechanical Measurements and Metrology. DATE:28/03/2017 SEM : 4th MAX. MARKS:15

Answer all Questions (FIVE MARKS) CO’s01.

02.

Explain the Principle of Autocollimator.Or

Explain with sketch Rope Brake Dynamometer.

CO 1

CO 1

03.

04.

A Calibrated meter end bar as an actual length of 1000.0003mm. It is to beused in calibration of two bars A and B, each having basic length of5000mm. when compared with meter bar LA+ LB it was found to be shorterby 0.0002mm. In comparing A with B it was found that A was 0.0004mmlonger than B. Find the actual length of A and B.

Or

Build 58.975mm and 68.208mm using M-112 set Gauges.

CO 1, 2

CO 2

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06.

With a neat Schematic diagram discuss Optical Pyrometer.

Or

Explain with sketch McLeod Gauge for Pressure measurement.

CO 4

CO 4

SCHEME AND SOLUTIONINTERNAL ASSISMENT I

SUBJECT: Mechanical Measurements and Metrology. SUBJECT CODE: 15ME46BFACULTY: SEMESTER: IV

Q.NO Solution MarksAllocated

1.

2.

PART-AAnswer any two Questions (10 Marks each)

Principle of Autocollimator

This is an optical instrument used for the measurement of small angulardifferences. For small angular measurements, autocollimator provides avery sensitive and accurate approach. Auto-collimator is essentially aninfinity telescope and a collimator combined into one instrument. Theprinciple on which this instrument works is given below. O is a pointsource of light placed at the principal focus of a collimating lens in Fig

Explain with sketch Rope Brake Dynamometer

The most device is the rope Prony brake as shown in Fig.

Two wooden blocks are mounted diametrically opposite on a

flywheel attached to the rotating shaft whose power is to be measured.

One block carries a lever arm, and an arrangement is provided to tighten

the rope which is connected to the arm. The rope is tightened so as to

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increase the frictional resistance between the blocks and the flywheel.

The torque exerted by the prony brake is T = F.L

where force F is measured by conventional force measuring

instruments, like balances or load cells etc. The power dissipated in the

brake is calculated by the following equation.

where force F is in Newtons, L is the length of lever arm in

meters, N is the angular speed in revolution per minute, and P in watts.

The prony brake is inexpensive, but it is difficult to adjust and maintain

a specific load.

58.975mm and 68.208mm M-112 set Gauges

M-112 set of slip gauges

Optical Pyrometer

Optical pyrometers use a method of matching as the basis for

their operation. A reference temperature is provided in the form of an

electrically heated lamp filament, and a measure of temperature is

obtained by optically comparing the visual radiation from the filament

with that from the unknown own source. In principle, the radiation from

one of the sources, as viewed is adjusted to match with that from the

other source. The two methods used are :

i) The current through the filament may be controlled electrically with

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the help of resistance adjustment or

ii) The radiation received by the pyrometer from the unknown source

may be adjusted optically by means of some absorbing devices.

McLeod Gauge for Pressure measurement

The operation of McLeod gage is based on Boyle’s law.

Where, p1 andp2 are pressures at initial and conditions

respectively, and v1 and v2 are volumes at the corresponding

conditions. By compressing a known volume of low pressure gas to a

higher pressure and measuring the resulting volume and pressure we can

calculate the initial pressure.

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SECOND INTERNAL TESTSUB CODE : 15ME46B TIME: 3.00-4.00 p.m.SUBJECT : Mechanical Measurements and Metrology DATE: 22-04-2017SEM : MAX. MARKS:15FACULTY :

Answer all Questions (FIVE MARKS) CO’S

01.

02.

Explain with block diagram the Generalized measurement system.Or

Explain with sketch Piezoelectric Transducer

CO 1, 4

CO 1, 4

03.

04.

Define. i) Hysteresis ii) Threshold iii) Precision Or

Explain with sketch Zeiss Ultra optimeter

CO 1

CO 1,4

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06.

With a neat sketch explain LVDT. Or

Explain with sketch Solex Pneumatic Gauge.

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CO 4

SCHEME AND SOLUTIONINTERNAL ASSISMENT II

SUBJECT: Mechanical Measurements and Metrology. SUBJECT CODE: 15ME46BFACULTY: HDN SEMESTER: IV (COMMON TO A, B)

Q.NO Solution MarksAllocated

1.

2.

3.

PART-AAnswer any two Questions (10 Marks each)

Generalized measurement system

Piezoelectric Transducer

. i) Hysteresis ii) Threshold iii) Precision

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4.

5.

Zeiss Ultra optimeter

LVDT

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Solex Pneumatic GaugeIt works on the principle of pressure difference generated by the airflow. Air is supplied at constant pressure through the orifice and the airescapes in the form of jets through a restricted space which exerts aback pressure. The variation in the back pressure is then used to find thedimensions of a component.

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