SRM University 2007 B.Tech Electronics and Communications Engineering Bank : Electronic Measurement

4. Six determinations of a volume as entered on the datasheet and presented to you for analysis are 12.35,12.71,12.48,12.24,12.63,12.58.Examine the data sheet and on the basis of your conclusions compute a)the arithmetic mean b)the standard deviation c)the probable curve in % of the avg. readings.
5. a) What is a bridge? Derive the balance condition for a bridge circuit in different forms.
6. b)List the advantages & disadvantages of bridge circuit.
7. Derive & Sketch the 1st order response of a step input & ramp input.
8. What is Flow measurement? discuss the Magnetic pickup kind flowmeter in detail.
9. What is a transfer function? explain on the roots of the characteristic formula of a 2nd order system.
10. Explain in detail the different kinds of Bourdon tubes.
11. A voltmeter having a sensitivity of 1000ohms per volt reads 100v on its 150v scale when connected across an unknown resistor in series with a milliammeter. When the milliammeter reads 5mA compute a)the apparent resistance of the unknown resistor b) the true resistance of the unknown resistor c)the fault due to loading effect of the voltmeter d)Repeat the identical if the milliammeter reads 800mA & the voltmeter reads 40 V on its 150V scale



UNIT - II

PART – A
1. Mention the main sources of errors in moving coil instruments.
2. Mention the main kinds of instruments used as ammeter & Voltmeters
3. For direct current measurement which kind of instrument are used.
4. Why Electrodynamometer are very useful as transfer instruments.
5. What is known as multiplier.
6. Mention the advantage and disadvantages of PMMC Instruments
7. Define transfer Instrument
8. What are the uses of electrodynamometer?
9. Mention the advantages and disadvantages of Electrodynamometer.
10. Mention the advantages of stair case kind digital voltmeter.
11. Mention the disadvantages of stair case kind digital voltmeter.
12. What is digital voltmeters?
13. What are the operating and performance characteristics of a digital voltmeter ?
14. How are digital voltmeters classified.
15. Mention the advantages and disadvantages of Ramp kind DVM
16. What is sample rate circuit?
17. What is the basic principle of dual slope kind DVM?
18. What is the basic principle of Ramp kind DVM?
19. Why dual slope technique has excellent noise rejection?
20. Draw the block diagram of an Integrating kind DVM.
21. An Integrator contains a 100 K ohm and one microfarad capacitor.If the voltage applied to the integrator is 1v ,What voltage will be current at the output of the integrator after 1s .

Earning:   Approval pending.