EC 2351 MEASUREMENTS AND INSTRUMENTATION QUESTIONBANK | ANNA UNIVERSITY QUESTION BANKQUESTION BANKEC 2351 MEASUREMENTS AND INSTRUMENTATION2 MARK QUESTIONS

UNIT I BASIC MEASUREMENT CONCEPTS

1. What is mean by measurement?2. What are the main functional elements in measurement system?3. How are instruments classified?4. Define static error.5. Define accuracy.6. Define sensitivity.7. Define dead time.8. What is environmental error?9. What are random errors?10. Define dynamic error.

UNIT II BASIC ELECTRONIC MEASUREMENTS

1. What are the main parts in CRO?2. What is the purpose of time base generator?3. Define deflection sensitivity.4. What is known as fluorescence?5. Explain split beam method.6. What are the two types of delay line used?7. What is dual trace CRO?8. What is Q factor?9. What is a sampling oscilloscope?

10. What is the purpose of time base circuit in a CRO?11. What are the applications of Q meter?12. What is vector impedance meter?13. Define deflection sensitivity.14. What are the various sources of errors in Q-Meter?

UNIT III SIGNAL GENERATORS AND ANALYZERS

1. What is an oscillator?2. What is known as duty cycle?3. Define Rise time, fall time.4. Define droop.5. Define rounding.6. Define pulse width.7. Define pulse period.8. What is a sweep frequency generator?9. What are the causes of distortion?

10. What is resolution in FFT spectrum analyzer?

UNIT IV DIGITAL INSTRUMENTS

1. What is analog instrument?2. What is digital instrument?3. What is DVM?4. What is known as quantization?5. What is known as quantization error?6. How is DC current measured in digital multimeter?7. What is offset current error?8. What is the need for period measurements?

UNIT V DATA ACQUISITION SYSTEMS AND FIBER OPTICMEASUREMENTS

1. What is meant by data acquisition?2. What is a multiplexer?3. What are the two types of MUX operation?4. What you mean by ATE?5. What is IEEE 488 bus system?6. Why ATN line is used?7. What is meant by talker, listener, controller?8. What are the three layers in OFC?

16 MARK QUESTIONS

UNIT I BASIC MEASUREMENT CONCEPTS

9. Discuss different type of Standards of measurement. Classify and explain the different typeof Standards of measurement.

10. Discuss basic characteristics of measuring devices.

11. Define and explain with examples the different types of possible errors in measurement.

12. With neat diagram explain the construction, working, torque equation and advantages ,disadvantages of PMMC instrument.

13. Explain any one bridge circuit for measurement of inductance.

UNIT II BASIC ELECTRONIC MEASUREMENTS

1. Explain the main parts in CRO.

2. Explain the main parts in CRT.3. Explain with block diagram of Sweep frequency generator.4. Explain with block diagram of dual beam oscilloscope.5. Explain with block diagram of dual trace oscilloscope.6. Explain the working principle of a vector voltmeter with the help of a neat block diagram.7. With a neat block diagram explain the function of a general purpose oscilloscope.8. Explain different types of power measurement.

UNIT III SIGNAL GENERATORS AND ANALYZERS

1. Explain how power is measured in an optical fiber.2. Explain with block diagram of Optical time domain reflectometer.3. Explain the wave analyzer.4. Draw and explain the working of Digital multimeter5. Explain the Instruments used in computer controlled instrumentation6. Describe the working of function generator with the a block diagram .

UNIT IV DIGITAL INSTRUMENTS

1. Explain with neat diagram.(ii) Single slope ADC(ii) Successive approximation ADC

2. Draw the Circuit diagram for n bit binary weighted resistor DAC & obtainan expression for output voltage.

3. Write short note on Flash type ADC.

4. Explain with block diagram, the operation of ramp type DVM.5. Draw and explain the circuit diagram of Digital frequency meter.

UNIT V DATA ACQUISITION SYSTEMS AND FIBER OPTICMEASUREMENTS

11. With the help of block diagram explain the data acquisition system.

2. With the help of block diagram explain analog to digital multiplexing.

3. Explain with block diagram the automatic test system to analyse an audioamplifier & radio receiver.

4. How signal is transmitted in a microprocessor based measurement?

5. Explain the sequence of operations in an IEEE 488 bus system.

Au questionsMay/june 2006

Part A1.Differentiate zero drift and span drift.2.Compare attraction and repulsion type instrument3.define deflection sensitivity4.give the characteristics of probes used in CRO5.Define harmonic distortion6.What is spectrum analyzer7.What are the advantage of digital instruments8.give the various types of digital voltmeter9/what is the necessary of digital interface

PARTB11 (i) Give a block biagram of computer based data acquisition syaytem. Explain each blockelaborately.(8)(ii) Discuss in detail the various techniques of multiplexing(8)

12 a (i)what are the types of errorii) With neat circuit diagram and phasor explain Anderson bridge derive suitable expression. What are its advantage anddisadvantage.

(or)b (i) with a neat diagram and phasor diagram discuss in detail about schering bridge. Find an expression for the capacitance,and dissipation factor.(ii) with a neat diagram explain 1. Construction, 2. Working, 3. Torque equation and 4. Advantages and disadvantages of aPMMC instruments.

13.a.i. With a neat diagram explain various parts of CROii. Explain the working of a Q meter with a neat circuit diagram. List the application of Q meter.

(or)b.i.with neat block diagram, explain in detail sampling oscilloscopes.

(ii) draw a test set up to measure of power at high frequencies.

14.a.i.with a neat block diagram explain signal generator.ii. with a neat block diagram, explain harmonic distortion analyser intermodulation distortion meter.

(or)b.i.draw a block diagram of heterodyne frequency generator and explain

15.a.i. with a neat block diagram and circuit, explain about of digital frequency meter.ii. Explain with neat diagram the working of integration type digital voltmeter.

(or)B.i. with a neat diagram explain the time interval measurement.ii. Expalin the working of potentiometric DVM. With a neat block diagram.

NOV/DEC-2006Part – a1.precision is necessary for not necessary condition for accuracy. True or false.2. What are the two conditions to make A.C bridge balance.3. what is vector voltmeter.4.justify-‘a CRO can be regarded as a X-Y recorder.5.What are the requirement of signal generator.6.What is real time spectrum analyzer7.Enumerate the advantage of digital meter aver analog meter.8.why is period mode preferred for measurement of low frequency in a frequency counter.9.What is meant by IEEE 488 standard of GPIB?10. What are the various instruments used in computer controlled instrumentation system.

Part-b11.a.i. Explain the types of errors possible in an instrument and also discuss their causes and remedies

ii. a resistance is measured by voltmeter ammeter method. Ammeter shows 3.22 A on a 10 A scale and the meter shows 96.6Von 300V range . Both ammeter 8v are guaranteed to be accurate within I 0.5% of full scale reading. Find the limiting error.

(or)11. b .i. Explain how schering bridge is used for the measurement of unknown capacitor. Derive its balance equation.ii.Explain how the quality factor can be obtained using schering bridge.

12.a.i.Draw and explain the digital storage oscilloscope and the modes of operation of digital storage oscilloscope.ii. what are lissajous patterns? How are they used for frequency measurement?

(or)b.i. explain how the Q-meter can be used for the measurement of Q factor and effective resistance and discuss the sources oferror.ii. a coil with a resistance of 10ohm is connected in the direct measurement mode. Resonance occurs when the oscillationfrequency is 1.0 Mhz and the resonating capacitor is set at 65pf. Calculate the % error introduced in the calculated value of Qby the 0.02ohm insertion resistance.

13.a.i. Draw and explain the block diagram of sweep generator.ii. What is marker generator? How does it overcome the disadvantages of a sweep generator?

(or)b.i. with a neat diagram, describe the operation of superhetrodyne spectrum analyzer.ii. what is the dynamic range a spectrum analyser with third order intercept point of +25dbm and a noise level of -85 dbm

14.a.i. With a neat diagram explain the operation of a dual slope ADC conversion.ii. a dual slope ADC used a 16 bit counter and 4 mhz clock rate. The maximum input voltage is +10v. The maximum integratoroutput voltage should be -8v, when the counter has cycled through 2n counts. The capacitor used in the integrator is 0.1microF. Find the value of resistor, R of the integrator.

(or)b.i.with a block schematic, explain the frequency mode and the frequency ratio mode operation of a frequency counter.ii. what is meant by gating error in a frequency counter. How does it arise? Can it be eliminated?

15.a.i. explain the generalised block schematic of a digital data acquisition system and list out its advantage over analog dataacquisition system.ii. what are the various techniques of multiplexing? Discuss any one in detail.

(or)b.i.draw the schematic diagram of a computer controlled measurement system for testing a adio receiver using an automaticsystem.ii. explain the various management lines and data transfer lines of GPIB.