SIDDHARTH GROUP OF INSTITUTIONS :: PUTTUR Siddharth Nagar, Narayanavanam Road QUESTION BANK (DESCRIPTIVE) UNIT I

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1 SIDDHARTH GROUP OF INSTITUTIONS :: PUTTUR Siddharth Nagar, Narayanavanam Road QUESTION BANK (DESCRIPTIVE) Subject with Code : EMI(16EC416) Year & Sem: III B.Tech & I Sem Course & Branch: B.Tech ECE Regulation: R16 UNIT I 1.a) Explain about static characteristics of measuring instrument. b) Define any two statistical analysis of measuring instrument. 2. a) Explain the construction of multi-range voltmeter&range extension DC voltmeter. b) A D Arsonval movement with a full scale deflection current of 50 µa and internal resistance of 500Ω is to be converted into a multirange voltmeter.define the value of multiplier required for 0-20v, 0-50v,0-100v, 3. a) Explain different types of errors that occur in measurements. b) Explain about Differential type voltmeter. 4. a) How do we determine the performance characteristics(static & dynamic) of an instrument. b) Explain the process of calibration. 5. a) Define sensitivity. Calculate the sensitivity of a 200 µa meter movement which is to be used as a dc voltmeter. b) Draw and explain solid state DC Voltmeter. 6. a) Explain the dynamic response of Zero order,first order,second order instrument. b) Explain multirange AC voltmeter. 7. a) With neat sketch explain thermocouple type RF ammeter. b) Discuss about basic DC Ammeters. 8. a) Describe with the help of circuit diagram the construction and working of a shunt-type ohm meter b) Explain the fundamental principle on which DC meter is constructed. 9. Explain how a multi-meter can be used as i) DC voltmeter & AC volt meter ii) DC ammeter & ohmmeter 10. a) Explain with the help of circuit diagram the construction & working of a series type ohm meter. b) A 100 Ω basic movement is to be used as an ohmmeter requiring full scale deflection of 1µa and internal battery voltage of 3v.A half scale deflection marking 1k Ω is required.calculate (i) find the value of R1and R2. (ii)maximum value of R2 to compensate for a3% drop in battery voltage Electronic Measurements and Instrumentation Page 1

2 UNIT II QUESTION BANK Draw the neat diagrams of both vertical & horizontal deflection systems and explain briefly about their working. 2. a) Discuss about important CRT features. b) Draw the block diagram of a dual beam oscilloscope & explain its working. 3. Draw the block diagram of a general purpose oscilloscope(cro) and explain function of each block 4. a) Explain the major parts of CRT with a block diagram. b) Compare dual trace oscilloscopes and dual beam CRO. 5. a) Draw the block diagram of Delay line circuit and explain its working. b) State the standard specifications of a sample CRO. 6. a) Discuss in detail, the construction and working of a digital sampling oscilloscope. b) Explain with a diagram how phase can be measured using a Lissajous method 7. a) Describe in details the construction and working of an analog type storage oscilloscope. b) Explain the principle of secondary emission. 8. a) State the various applications of an oscilloscope. b) Explain the function of trigger circuit. 9. a) Explain with a diagram how frequency can be measured using a Lissajous method b) Briefly discuss about digital storage oscilloscope. 10. a) Explain with the block diagram how the digital frequency and time period can be measured using counter/meter instrument. b) What are the different types of CRO probes? UNIT III 1. a) With the help of block diagram explain the functioning of a conventional standard signal generator. b) Write about fixed AF oscillator and variable AF oscillator. 2. a) Draw the block diagram of a function generator and explain its operation. b) List the applications of random noise generator. 3. With a neat diagram discuss the operation of a pulse generator. 4. a).discuss in detail about RF signal generator operation. b) Explain the method of generate random noise. 5. a) Explain the working of a standard sweep generator with diagram. b) What is sweep generator? Explain in detail. 6. a) With help of a neat sketch, explain the working of a frequency selective wave analyser. b) What is the function of wave analyser? 7. a) Describe with diagram the operation of a Logic analyser. b) List the application of wave analysers. 8. a) Draw the circuit diagram and explain the working of a heterodyne type wave analyser. b) What is distortion? What does a distortion analyser measure 9. a) What is the function of harmonic distortion analyser. b) Describe the diagram with operation of a harmonic distortion analyser using Wein bridge and frequency selective type. Electronic Measurements and Instrumentation Page 2

3 10.a) With a neat sketch explain the operation of Spectrum analyser. b) Explain how wave analyser can be tuned to a particular frequency with in the audible frequency range. Prepared by: J.Jhansi,V.Latha Electronic Measurements and Instrumentation Page 3

4 SIDDHARTH GROUP OF INSTITUTIONS :: PUTTUR Siddharth Nagar, Narayanavanam Road QUESTION BANK (OBJECTIVE) Subject with Code : EMI(16EC416) Year & Sem: III B.Tech & I Sem UNIT I Course & Branch: B.Tech ECE Regulation: R16 1.The true value of quantity change with time is known as (a) static error (b) Dynamic error c) Speed of response (d) Lag 2. Which of the following is not a static characteristics (a) Drift (b) Dead zone (c) sensitivity (d) Fidelity refers to the degree of closeness or conformity to the true value of quantity under measurement (a) Precision (b) Accuracy (c) Drift (d) Resolution is defined as the nearness of the indicated value to the true value of the quantity being measured (a) Accuracy (b) Precision (c) Reproducibility (d) Static error 5. A meter reads V and the true value of voltage is What is static error (a) 0.07V (b) 0.7V (c) -0.7V (d) What type of errors are due to largely human errors like misreading of instruments (a) Gross error (b) Systematic errors (c) Random error (d)environmental error 7. The AC voltmeter using PMMC measures (a) True RMS voltage (b) Peak voltage (c) Average voltage (d) Instantaneous value 8. The true RMS voltmeter measures (a) average value (b) Instantaneous value (c) RMS value (d) Peak value 9. The instrument required to measure voltage is (a) Ohmmeter (b)ammeter (c) Voltmeter (d) Wattmeter 10. A D Arsonval Movement is (a) Taut band (b) PMMC (c) Electrodynamometer (d) Moving Iron type 11. The sensitivity of a voltmeter is defined as (a) ᘯ/V (b) V/ᘯ (c) I/ᘯ (d) ᘯ/I 12. A measure of the consistency or repeatability of measurement is known as (a) Precision (b) Resolution (c) Accuracy (d) Sensitivity 13.Variance = (a) Standard deviation (b) 1/ Standard deviation (c) 1/( Standard deviation) 2 (d) ( Standard deviation) is defined as the degree to which the instrument indicates the changes in the measured without dynamic error (a) Fidelity (b) Dynamic error (c) Speed of response (d) settling time 15. A set of readings has a wide range and therefore it has (a) Low precision (b) Dynamic precision (c) low accuracy (d) High accuracy 16. Which of the characteristic is not a dynamic characteristic? Electronic Measurements and Instrumentation Page 4

5 (a) Fidelity (b) Dynamic error (c) Resolution (d) Measures lag is the rapidity with which a measuring device responds to the change in the measured (a) Dynamic error (b) Fidelity (c) measurement lag (d) speed of response is the difference between the true value of quantity and the value indicated by instrument (a) Dynamic error (b) Fidelity (c) measurement lag (d) Speed of response 19. A D' Arsonval movement is rated at 50 μa, Its sensitivity is given by (a) 200 (b) (c) 0.02 (d) is defined as the ability of the instrument to reproduce a certain set of readings within a given accuracy (a) Accuracy (b) Precision (c) Reproducibility (d) Static error 21. The smallest measurable input change is called (a) Resolution (b) threshold (c) Dead zone (d) drift is defined as the difference between the largest and smallest reading of instrument (a) Span (b) Range (c) deadspace (d) Resolution is defined as the nearness of the indicated value to the true value of the quantity being measured (a) Accuracy (b) Reproducibility (c) Reproducibility (d) Static error 24. The voltage of a circuit is measured by a voltmeter having input impedance comparable with the output impedance of the circuit there by causing error in voltage measurement. This error may be called as (a) gross error (b)random error (c) error caused by misuse of instrument (d) error caused by loading effect is defined as the largest change in input quantity for which there is not output of the instrument (a) Fidelity (b) accuracy (c) dead zone (d) drift 26. What type of errors are due to shortcomings of the instruments like detective (or) worn parts? (a) gross errror (b)random error (c) systematic errors (d) Environmental errors 27. Accuracy is expressed as (a)relative acceracy (b) % accuracy (c) error (d) % error 28. A 0-300V voltmeter has an error of ± 2% of full scale deflection. What would be the range of readings if true voltages is 30V? (a)24v-36v (b)29.4v-30.6v (c) 20V to 40V (d) 30V-40V is the delay in the response of the instrument to the change in the measured quantity (a)fidelity (b) Dynamic error (c) Speed of response (d) measurement lag 30. is the time for the instrument not reach and stay within a specified tolerance band around its final value. (a)fidelity (b) Dynamic error (c) Speed of response (d) Settling time 31. A 1mA d'arsonval multimeter movement has a resistance of 100 Ω. I is to be converted to 10V voltmeter. The value of multiplier resistance is given by (a) 999 Ω. (b) 9999 Ω. (c) 990 Ω. (d) 9900 Ω. 32. Which of the characteristic is not a dynamic characterstic? (a)fidelity (b) Dynamic error (c) Resolution (d) Measured lag is the delay in the response of the instrument to the change in the measured quantity (a)dynamic error (b) Fidelity (c) Measured lag (d) Speed of response Electronic Measurements and Instrumentation Page 5

6 34.A digital voltmeter has a readout range from 0 to 9,999 counts. Determine the resolution (a) 1 mv (b) 10 mv (c) 100 mv (d) 1000 mv 35. Gross errors occur due to (a)human error (b) instrumental error (c) random error (d) none 36. In measurement system, which of following are undesireble static characterstics? (a)sensitivity, accurancy (b) Drift, static error and dead zone (c)reproducibility, nonlinearity (d) Drift, static error, dead zone and non-linearity 37. Static errors occurs due to (a)measuring devices (b) Human error (c) random error (d) none 38. A. 1mA ammeter has a resistance of 100 Ω. It is to be converted to a 1A ammeter. The value of shunt resistance is (a)0.001ω (b) Ω (c) Ω (d) 100 Ω 39. A 1mA meter movement with an internal resistance of 100Ω is to be converted in to 0-100mA ammeter. Calculate the value of shunt current I S = (a)10ma (b)1ma (c) 99mA (d) 100mA 40. The addition of a , converts the basic d'arsonval movement into a DC voltmeter (a)parallel resistor (b) Series Capacitor (c) Series resistor (d) Parallel Capacitor Prepared by: J.Jhansi,V.Latha Electronic Measurements and Instrumentation Page 6