University of Mumbai 2009-3rd Sem B.E Electrical and Electronics Engineering Electrical Measurements & Measuring Instruments Old - Question Paper
Electrical Measurements & Measuring Instruments Old Course Sem III May 2009
' *}tcV\tu f>tavn<.-rwn>*4- WtasuVw.}
on. 2510-09. (OLD COURSE)7%VU-mrVCir'V4. VR3052
(3 Hours) [Total Marks : 100
N.B. : (1) Question No. 1 is compulsory.
(2) Attempt any four questions out of remaining six questions. n fA.
(3) Figures to the right indicate full marks.
1. (a) Derive relationship between electrostatic and electromagnetic system of units. 10
Aslo obtain dimensions of capacitance, resistance and inductance in electrostatic system.
(b) Define "Guarantee Error". Explain types of errors with appropriate examples. 10
2. (a) Explain Diamagnetism, Paramagnetism and Ferromagnetism". 10 (b) What is B-H curve. Explain any one method of plotting B-H curve. What 10
information Is derived from the curve ?
3. (a) Explain basic operation, measurement errors, limitations and applications 10
of Wheatstone Bridge.
(b) Explain fundamentals of measurements of elements using A.C. bridges with 10 the help of Generalised AC bridge.
4. (a) Explain use of copper shading bands in case of induction type Energy Meters. 10 What, is "Creep ?
(b) Explain with neat diagram construction and working of "single phase 10 Electrodynamometer type wattmeter."
5. (a) Describe with neat diagram construction and working of PMMC instruments. 10 Derive torque equation.
(b) A 5 Amp, 230 Volts meter on full load unity power factor test makes 60 revolutions 10 In 360 seconds, if the normal disc speed is 520 revolutions per kwh. What is the percentage error ? Also comment on speed of disc.
6. (a) Explain different applications of D.C. potentiometers. 10
(b) A milliammeter of 2-5 a resistance reads up to 100 milliampears. What resistance 10 is necessary to enable it to be used as :
(i) A voltmeter reading up to 10 Voits.
(ii) An Ammeter reading up to 10 Amp.
Draw the connection diagram in each case.
7. Write short notes on any four 20
(a) Synchroscope
(b) Megger
(c) Power factor meter
(d) Errors in CT and PT
(e) Measurement of Low, Medium and High Resistance.
|
Attachment: |
| Earning: Approval pending. |
