MCQOPTIONS
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MCQOPTIONS
This section includes 26 Mcqs, each offering curated multiple-choice questions to sharpen your Instrumentation Transducers knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
______ is an example of a passive transducer that uses the variation in electrical resistance in wires to sense the ______ produced by a force on the wires. |
| A. | Bimetallic strip; stress |
| B. | Strain gauge; strain |
| C. | LVDT; strain |
| D. | RVDT; stress |
| Answer» C. LVDT; strain | |
| 2. |
Direction: It consists of two statements, one labelled as Statement (I) and the other as Statement (II). Examine these two statements carefully and select the answers to these items using the codes given below:Statement (I): A ‘strain gauge’ is an example of a ‘Transducer’ or an electromechanical transformer.Statement (II): In the ‘strain gauge’, displacement is used to vary the resistance of a circuit component and the ‘strain’ is measured in terms of the change in the resistance. |
| A. | Both statement (I) and Statement (II) are individually true and Statement (II) is the correct explanation of Statement (I) |
| B. | Both statement (I) and Statement (II) are individually true and Statement (II) is not the correct explanation of Statement (I) |
| C. | Statement (I) is true but Statement (II) is false |
| D. | Statement (I) is false but Statement (II) is true |
| Answer» B. Both statement (I) and Statement (II) are individually true and Statement (II) is not the correct explanation of Statement (I) | |
| 3. |
A resistance strain gauge is used to measure the stress of steel which is stressed to 1200 kg/cm2. If the gauge factor is 2.5 and Young’s modulus of steel is 2 x 106 kg/cm2, the percentage change in resistance of the gauge is |
| A. | 0.05% |
| B. | 0.10% |
| C. | 0.15% |
| D. | 0.25% |
| Answer» D. 0.25% | |
| 4. |
Direction: The following item consists of two statements, one labelled as ‘Statement (I)’ and the other as ‘Statement (II)’. Examine these two statements carefully and select the answers to these items using the code given below:Statement I: The gauge factor of a strain gauge is the ratio of strain to per unit change in resistance.Statement II: Poisson’s effect is defined as producing less strain with opposite sign on the plane perpendicular to the applied load. |
| A. | Both Statement I and Statement II are individually true and Statement II is the correct explanation of Statement I |
| B. | Both Statement I and Statement II are individually true but Statement II is not the correct explanation of Statement I |
| C. | Statement I is true but Statement II is false |
| D. | Statement I is false but Statement II is true |
| Answer» E. | |
| 5. |
Dummy strain gauges are used for: |
| A. | Compensation of temperature changes |
| B. | Increasing the sensitivity of bridge in which they are included |
| C. | Compensating for different expansion |
| D. | Calibration of strain gauges |
| Answer» B. Increasing the sensitivity of bridge in which they are included | |
| 6. |
Four identical resistive strain gauges with gauge factor of 2.0 are used in a Wheatstone bridge as shown in the figure below. Only one of the strain gauges RSENSE changes its resistance due to strain. If the output voltage VOUT is measured to be 1 mV, the magnitude of strain, in units of microstrain, is |
| A. | 1 |
| B. | 10 |
| C. | 100 |
| D. | 1000 |
| Answer» E. | |
| 7. |
A resistance wire strain gauge with a gauge factor of 2 is bonded to a steel structural member subjected to a stress of 100 MN / m2. The modulus of elasticity of steel is 200 GN / m2. The change in the value of gauge resistance due to the applied stress will be |
| A. | 0.05% |
| B. | 0.10% |
| C. | 0.30% |
| D. | 0.60% |
| Answer» C. 0.30% | |
| 8. |
A resistance strain gauge is cemented to a steel member, which is subjected to a strain of 2 × 10-6. If the original resistance is 100 Ω and change in resistance is 600 μΩ, the gauge factor will be |
| A. | 3 |
| B. | 0.33 |
| C. | 300 |
| D. | 0.03 |
| Answer» B. 0.33 | |
| 9. |
A structural member is compressed to produce a strain of 5 μm/m. The nickel wire strain gauge has a gauge factor of -12.1. The pre-stress resistance of the gauge is 120 Ω. The change in resistance due to compressive strain will |
| A. | increase the resistance by 7.26 mΩ |
| B. | decrease the resistance by 7.26 mΩ |
| C. | increase the resistance by 49.6 mΩ |
| D. | decrease the resistance by 49.6 mΩ |
| Answer» C. increase the resistance by 49.6 mΩ | |
| 10. |
A resistance strain gauge with a gauge factor of 2.0 is fastened to a steel member subjected to a stress of 100 N/mm2. The modulus of elasticity of steel is approximately 2 × 105 N/mm2. The percentage change in resistance is |
| A. | 1.5 |
| B. | 1 |
| C. | 0.15 |
| D. | 0.1 |
| Answer» E. | |
| 11. |
Measurement of pressure can be done by using wire, foil, or semiconductor type Strain Gauges. The disadvantage of the semiconductor type of Strain Gauge compared to the other two is in terms of |
| A. | Gauge factor |
| B. | Hysteresis characteristics |
| C. | Temperature sensitivity |
| D. | Frequency response |
| Answer» D. Frequency response | |
| 12. |
A resistance strain gauge with a guage factor of 3 is fixed to a steel member subjected to a stress of 100 N / mm. The Young’s modulus of steel is 2 × 105 N / mm2.The percentage change in resistance is |
| A. | 0.1% |
| B. | 0.15% |
| C. | 1.0% |
| D. | 1.5% |
| Answer» C. 1.0% | |
| 13. |
Direction: It consists of two statements, one labelled as Statement (I) and the other as Statement (II). Examine these two statements carefully and select the answers to these items using the codes given below:Statement (I): The principle of the resistance strain gauge is that if gauge factor is known, the measurement of \(\frac{{dR}}{R}\) allows the measurement of strain \(\frac{{dL}}{L} = \varepsilon \)Statement (II): The output of a LVDT is of the order of millivolt. |
| A. | Both statement (I) and Statement (II) are individually true and Statement (II) is the correct explanation of Statement (I) |
| B. | Both statement (I) and Statement (II) are individually true and Statement (II) is not the correct explanation of Statement (I) |
| C. | Statement (I) is true but Statement (II) is false |
| D. | Statement (I) is false but Statement (II) is true |
| Answer» C. Statement (I) is true but Statement (II) is false | |
| 14. |
A resistance strain gauge with a gauge factor of 3 is cemented to a steel member subjected to a strain of 2 × 10-6. If the original resistance is 100 Ω, what is the change in resistance? |
| A. | 600 μΩ |
| B. | 600 mΩ |
| C. | 300 μΩ |
| D. | 200 μΩ |
| Answer» C. 300 μΩ | |
| 15. |
A strain gauge with gauge factor 4 and resistance 250 Ω undergoes a change of 0.15 Ω during a test. The measured strain is |
| A. | 150 × 10-4 |
| B. | 15 × 10-4 |
| C. | 1.5 × 10-4 |
| D. | 0.15 × 10-4 |
| Answer» D. 0.15 × 10-4 | |
| 16. |
In wire wound strain gauges, the change in resistance is due to |
| A. | Change in diameter of the wire |
| B. | Change in length of the wire |
| C. | Both 1 and 2 |
| D. | None of the above |
| Answer» D. None of the above | |
| 17. |
WHICH_OF_THE_FOLLOWING_IS_CORRECT_FOR_THERMISTORS??$ |
| A. | Positive temperature coefficient of resistance |
| B. | Negative temperature coefficient of resistance |
| C. | Unpredictable temperature coefficient |
| D. | None of the mentioned |
| Answer» C. Unpredictable temperature coefficient | |
| 18. |
Thermistors_have_high_stability.$ |
| A. | True |
| B. | False |
| Answer» C. | |
| 19. |
Thermistors may be in wire form? |
| A. | True |
| B. | False |
| Answer» C. | |
| 20. |
Which of the following can be used to measure using thermistors? |
| A. | Very low |
| B. | In-between 100Ω and 1MΩ |
| C. | Greater than 1MΩ |
| D. | None of the mentioned |
| Answer» C. Greater than 1M‚Äö√Ñ√∂‚àö√´¬¨‚àÇ | |
| 21. |
A metal with temperature coefficient of resistance has a value 200, its initial resistance is given by 40Ω. For an increase in 300c to350c what will be the final resistance value?$ |
| A. | 40 KΩ |
| B. | 4 KΩ |
| C. | 40 Ω |
| D. | 400 Ω |
| Answer» B. 4 K‚Äö√Ñ√∂‚àö√´¬¨‚àÇ | |
| 22. |
What is the relation of temperature coefficient of resistivity on coefficient of thermal expansion in RTD? |
| A. | Higher |
| B. | Lower |
| C. | Equal |
| D. | None of the mentioned |
| Answer» B. Lower | |
| 23. |
What will happen for resistivity metal and semiconductor if temperature is increased? |
| A. | Increases |
| B. | Decreases |
| C. | For metal increases and for semiconductor decreases |
| D. | For metal decreases and for semiconductor increases |
| Answer» D. For metal decreases and for semiconductor increases | |
| 24. |
Which of the following can be measured using change in resistivity? |
| A. | Temperature |
| B. | Visible radiation |
| C. | Moisture content |
| D. | All of the mentioned |
| Answer» E. | |
| 25. |
What will happen to resistance, if length of conductor is increased? |
| A. | Decreases |
| B. | No change |
| C. | Increases |
| D. | Doubles |
| Answer» D. Doubles | |
| 26. |
Resistive transducers are ______________ |
| A. | Primary transducers |
| B. | Secondary transducers |
| C. | Either primary or secondary |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |