Maharashtra State Board of Technical Education 2007 Diploma Mechanical Engineering Measurement & Measuring System - Annual Pattern - Question Paper

Measurement & Measuring System
Third Year : 2007
3 Hr / 100 Marks

Instructions:

1. All ques. are compulsory.
2. Illustrate your answers with neat sketches wherever necessary.
3. Use of Non-Programmable Electronic Pocket Calculator is permissible.
4. Figures to the right indicate full marks.
5. Mobile phone, pager and any other Electronic Communication devices are not permissible in exam Hall.


1. Attempt any 5 of the following: [Marks: 20]

a) elaborate various fuctions of instrument and measuring system?

b) State the various standards of measurement and discuss in brief.

c) describe range and span of measuring instrument. provide 1 example.

d) What is hysteresis and dead zone? State its significance with neat and necessary sketch.

e) describe absolute pressure, gauge pressure, atmospheric pressure.

f) State the working of ionisation gauge with necessary figure.

g) elaborate the various kinds of flow? State necessary mathematical equations.


2. Attempt any 4 of the following: [Marks: 16]

a) State the functional elements of generalised measurement system with necessary block diagram.

b) State the various kinds of errors in the measuring instrument.

c) What is 1st order instrument? State with 1 example of instrument and necessary block diagram.

d) Draw a neat sketch of Mcleod gauge and state working principle of it.

f) How measurement of flow is done using positive displacement meters? discuss any 1 such instrument with neat sketch.


3. Attempt any 4 of the following: [Marks: 16]

a) With a neat sketch define the working of rotameter.

b) State the working principle of hot wire anemometer for flow measurement? Draw the sketch.

c) What is bimetallic thermometer? define with figure its working principle.

d) define the construction and working of resistance thermometer.

e) What is the special property of thermisters? elaborate its various kinds.

f) Which parameter is measured using Linear variable differential transducer (LVDT)? define its construction and working.


4. Attempt any 4 of the following: [Marks: 16]

a) describe gauge factor? What is the working principle of strain gauge?

b) elaborate the various elements of wire kind bonded strain gauge? define with neat sketch.

c) define the working principle of pendulum scale with neat sketch.

d) define the working principle of electromagnetic balance.

e) What is the instrument used for measurement of Torque and Power? define any 1 of them.

f) define construction and working of hand speed indicator.


5. Attempt any 4 of the following: [Marks: 16]

a) define construction and working of optical pyrometer. What is the range of temperature that can be measured.

b) What is vibrating reed kind of techometer?

c) define construction and working of photo electric tachometer.

d) define construction and working of float gauge for liquid level management.

e) How the bubbler and purge system is used for liquid level control?

f) define the instrument used for measurement of dry bulb and wet bulb temperature.


6. Attempt any 4 of the following: [Marks:16]

a) define working of tool dynamometer.

b) What is the working principle of drag cup tachometer? discuss its working with figure.

c) discuss any 1 instrument used for sound measurement.

d) State the various laws of thermo couple and its elements.

e) elaborate various methods used for flow visualisation.

f)define the term Measuring Lag, Fidelity, dynamic error, overshoot.

Earning:   Approval pending.