# Measurements & Instrumentation Two Marks Questions

Here you can find the Measurements & Instrumentation Two Marks Questions list which are asked in exams.

## Measurements & Instrumentation Questions

2 mark questions

L-1

1. A 0-150V voltmeter has a guaranteed accuracy of 1 percent full-scale reading. The voltage measured by this instrument is 83V. Calculate the limiting error in percent.

2. Difference between a primary and secondary standard

3. Significance of measurements

4. Compare moving coil with moving iron instruments

5. Which meter is useful for measuring only DC quantities?

6. Draw the circuit of Wien Bridge and its phasor diagram under balance

7. Error

8. Distinguish between attraction and repulsion type instrument

9. Distinguish between accuracy and precision

10. Two conditions to be satisfied to make an ac bridge balanced

11. In a wheatstone bridge, a change of 6 ohm in the unknown arm of the bridge is required to produce a change in deflection of 2.4 mm of the galvanometer. Determine the sensitivity and deflection factor

12. Basic elements of generalized measurement system

13. Precision

14. Measurement and classification

15. Calibration

16. Different types of errors

17. An ac bridge has the following constants. AB=1 kohm, parallel with C=159 nF, BC=I kohm, CD=500 ohm, DA=0.636 microF in series with an unknown resistance. Find the value of the resistance in an DA to produce balance

18. Draw the circuit of Wien’s bridge and its phasor diagram under balance

19. Transfer instrument

20. Basic elements of generalized measurement system

21. Any four static characteristics of a measuring system

22. Accuracy

23. Differentiate zero drift and span drift

24. Distinguish between active and passive instruments

26. Basic requirements of measurement

27. Applications of dynamic characteristics of instruments

28. Precision is a necessary but not sufficient condition for accuracy. True or false – justify your answer

29. How is the absolute ampere determined

30. Standard and different types of standard in measurement

31. Static error and classification of static error

32. Define the international standard for ohm

L-2

1. Parameters measured using CRO

2. Use of delay line

3. Draw the internal structure of CRT and list its functions

4. Significant problems with diodes when used for RF rectification

5. Sweep voltage in an oscillator and where it is applied

6. Vector meter and applications

7. Q-meter and applications

8. Deflection sensitivity (of CRT)

9. Vector voltmeter and application

10. What is the velocity of electrons that have been accelerated through a potential of 2000V?

11. Basic principle of delayed time base oscilloscope

12. Vector impedance meter and applications

13. Two significant problems with diodes when used for RF rectification

14. Applications of CRO

15. Basic principle behind the working of Q-meter

16. Two modes of operation of dual trace oscilloscope

17. Main parts of CRT

18. How is the electron beam focused to a fine spot on the face of the cathode ray tube

19. Fluorescence

20. Principle of dual beam oscilloscope

21. Principle of sampling oscilloscope

22. Deflection system is required for dual beam oscilloscope

23. Characteristics of probes used in CRO

24. Difference between digital and analog oscilloscopes

25. Justify – ‘A CRO can be regarded as a X-Y recorder’.

26. Disadvantages of storage cathode ray tube

28. Internal structure of CRT and list its functions

29. Applications of digital storage oscilloscope

30. Need for Q-meter

31. List the source of error that affect measurement accuracy of Q-meter

32. Applications of Q-meter

L-3

1. Wave analyzer

2. Use of attenuator in sine wave generator

3. Barkhausen criteria for sinusoidal oscillation (sustained oscillation)

4. Draw the block diagram of spectrum analyzer

5. Need for isolation between the signal generator output and oscillator and how can be this done

6. What is the maximum frequency and resolution for an analyzer using a 1.5 s window and a 1500 KHz sample rate?

7. Classification of signal generators

8. Harmonic distortion

9. Requirements of signal generators

10. What is the dynamic range of a spectrum analyzer if the noise level of the display is equal to -80 dB and two -10 dB signal produce third order intermodulation products that just appear above the noise?

11. In a sweep frequency generator, two oscillators, one with frequency range of 3 GHz to 5 GHz is heterodyned with a second oscillator having a fixed frequency output of 3 GHz. What is the range of output frequency?

12. Signal sources and the desirable characteristics of a signal

13. THD

14. List different instruments used as signal analyzers

15. Any four features of sweep frequency generator

16. Frequency synthesis using indirect method

17. A signal is sampled for 4 seconds at 20 kHz rate using 10 bit conversion. Calculate the dynamic range, spectral frequency and resolution

18. How does placing a fixed attenuator ahead of a spectrum analyzer affect the third order intercept and noise figure

19. Heterodyne principle

20. Distortion factor (total harmonic distortion)

21. Harmonic distortion

22. Use of distortion meter

23. Spectrum analyzer

24. Real time spectrum analyzer

25. Drawbacks of tuned circuit analyzers

26. Applications of wave analyzers

27. Difference between network analyzer and spectrum analyzer

28. Function of an attenuator in a signal generator

29. Rise time and fall time of a pulse

30. Draw the simplified block diagram of a sweep frequency generator

31. Any three applications of frequency synthesizer

L-4

2. Components required for a computer-operated test system

4. Different types of digital voltmeter

5. A frequency meter with 1 MHz clock source is used for measuring the time period of input wave. Determine the measured time period when 1560 pulses are registered on the display.

6. Ways to extend the frequency range

7. A digital frequency counter which has a 3-digit display, gated period of 10 milliseconds, is selected to measure an unknown frequency. The reading is 045. What is the frequency of the system?

9. Need for multiple period measurement

10. Classification of digital voltmeter

11. Different guarding techniques used in digital instruments

12. Resolution and sensitivity of DVM

13. A digital voltmeter has a read out range from 0 to 9999 counts. Determine the resolution of the instrument in volts when the full scale reading is 9.999 V

14. Virtual instruments

15. Requirements of computer controlled systems (automatic test systems)

16. Draw the block diagram for computer controlled testing for an audio amplifier

17. Draw the block diagram for computer controlled testing for a radio receiver

18. Difference between analog and digital instruments

19. Essential parts of a ramp-type digital voltmeter

20. Additional features found on individual digital multimeters

21. Principle of ramp type DVM

22. How prescalar can be use to extend range of frequency counter

23. Why period mode preferred for measurement of a very low frequency in a frequency counter

24. Importance of gate time in frequency counter

25. How is trigger time error reduced

L-5

1. Data loggers

2. What is the velocity of light in a glass with an index of refraction of 1.38?

3. Draw the block diagram of Digital Data Acquisition System

4. Key features of fully automatic digital instruments

5. Handshake signals in the IEEE 488 bus system

6. Applications of OTDR

7. Data acquisition system

8. Compare analog and digital data acquisition systems

9. Numerical aperture

10. Data acquisition system

11. How much loss will be experienced if a fiber of numerical aperture of 0.3 is the source for a fiber with a numerical aperture of 0.242?

12. Basic operating principle of digital tape recording

13. Three-state bus transceiver

14. Distinguish between active and passive transducers

15. List any 4 causes of power loss in fiber-optic cables

16. Need for multiplexing and how is it classified

17. Any three instruments used in computer controlled instrumentation

18. Specify the analog data acquisition systems element

19. Handshake singles in IEEE 488 bus system

20. Necessity of digital interface

21. IEEE 488 bus system

22. Multiplexing

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