MCQOPTIONS
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MCQOPTIONS
This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The second order system with the transfer function 4/(S² + 2S + 4) has a damping ratio of |
| A. | 2.0 |
| B. | 0.5 |
| C. | 1.0 |
| D. | 4.0 |
| Answer» C. 1.0 | |
| 2. |
Temperature measurement by optical pyrometer is done above __________ point, which is 1063°C. |
| A. | Antimony |
| B. | Gold |
| C. | Silver |
| D. | Nickel |
| Answer» C. Silver | |
| 3. |
Temperature measurement range of iron-constantan thermocouple is 0 to 870°C. It can be used to measure sub zero temperature, because at lower temperature |
| A. | Emf produced is very low of the order of microvolt |
| B. | Embrittlement of iron occurs |
| C. | Rusting of iron takes place |
| D. | Both B and C |
| Answer» E. | |
| 4. |
The temperature of tempering oil baths maintained at 400°C during heat treatment of steel is measured by a/an __________ thermocouple. |
| A. | Chromel-alumel |
| B. | Iron-constantan |
| C. | Platinum-platinum/rhodium |
| D. | None of these |
| Answer» C. Platinum-platinum/rhodium | |
| 5. |
Which of the following is not classified as a thermo electric pyrometer? |
| A. | Resistance thermometer |
| B. | Thermocouple |
| C. | Optical pyrometer (disappearing filament type) |
| D. | Radiation pyrometer |
| Answer» D. Radiation pyrometer | |
| 6. |
The root locus plot of the roots of the characteristics equation of a closed loop system having the open loop transfer function K(s + 1)/2(2s + 1)(3s + 1) will have a definite number of loci for variation of K from 0 to ∞. The number of loci is |
| A. | 1 |
| B. | 3 |
| C. | 4 |
| D. | 2 |
| Answer» C. 4 | |
| 7. |
The response of two tanks of same size and resistance in series is%! |
| A. | Under damped |
| B. | Critically damped |
| C. | Over damped |
| D. | None of the above |
| Answer» C. Over damped | |
| 8. |
To increase the speed of response of a pressure spring liquid or gas expansion thermometer, the clearance space between the thermometer bulb and the thermal well should not be filled with%! |
| A. | Air |
| B. | A metal powder or graphite |
| C. | Oil |
| D. | Mercury |
| Answer» B. A metal powder or graphite | |
| 9. |
Concentration of sugar solution can be determined by the%! |
| A. | Polarimetry |
| B. | Flame photometry |
| C. | Emission spectroscopy |
| D. | Oscillometry |
| Answer» B. Flame photometry | |
| 10. |
Which of the following is not a variable area flow meter?%! |
| A. | Piston type meter |
| B. | Rotameter |
| C. | Magnetic flow meter |
| D. | Orifice and tapered plug meter |
| Answer» D. Orifice and tapered plug meter | |
| 11. |
Positioning controllers are used for%! |
| A. | Low loads |
| B. | Temperature changes |
| C. | High loads |
| D. | Flow rate changes |
| Answer» D. Flow rate changes | |
| 12. |
In a shell and tube heat exchanger, the inlet temperature of heating/cooling fluid is the __________ variable.%! |
| A. | Load |
| B. | Manipulated |
| C. | Controlled |
| D. | None of these |
| Answer» B. Manipulated | |
| 13. |
Bimetal strips are not used in%! |
| A. | Bimetallic thermometers |
| B. | Thermocouples |
| C. | Thermostats |
| D. | Relays for opening & closing of electrical circuits |
| Answer» C. Thermostats | |
| 14. |
__________ are analysed using a polarograph.%! |
| A. | Isotonic solutions |
| B. | Solids |
| C. | Liquids |
| D. | Gases |
| Answer» C. Liquids | |
| 15. |
A mercury barometer measures the __________ pressure.%! |
| A. | Atmospheric |
| B. | Gauge |
| C. | Vacuum |
| D. | Absolute |
| Answer» B. Gauge | |
| 16. |
__________ stability method uses open loop transfer function.%! |
| A. | Nyquist |
| B. | Mikhalov |
| C. | Ruth |
| D. | None of these |
| Answer» B. Mikhalov | |
| 17. |
Thermal conductivity measurement com-prises the working principle of a%! |
| A. | CO‚ÇÇ analyser |
| B. | Polarimeter |
| C. | Spectrometer |
| D. | Chromatograph |
| Answer» B. Polarimeter | |
| 18. |
An amplitude ratio of 0.1 corresponds to __________ decibels.%! |
| A. | 20 |
| B. | -20 |
| C. | 10 |
| D. | -10 |
| Answer» C. 10 | |
| 19. |
Non-metallic diaphragm used as pressure sensor in instruments is generally made of%! |
| A. | Teflon |
| B. | Synthetic rubber |
| C. | Bakelite |
| D. | Thick paper |
| Answer» C. Bakelite | |
| 20. |
Feed forward controller accounts for the __________ changes. |
| A. | Set point |
| B. | Load |
| C. | Both A & B |
| D. | Neither A nor B |
| Answer» C. Both A & B | |
| 21. |
Degree to which an instrument indicates the changes in measured variable without dynamic error is called its%! |
| A. | Speed of response |
| B. | Reproducibility |
| C. | Fidielity |
| D. | Static characteristics |
| Answer» D. Static characteristics | |
| 22. |
Suppose that the gain, time constant and dead time of a process with the following transfer function:Gc(s) = 10 exp( - 0.1s)/(0.5s + 1) are known with a possible error of ± 20% of their values. The largest permissible gain Kc of a proportional controller needs to be calculated below taking the values of process gain, time constant and dead time as%! |
| A. | 8, 0.6, 0.08 |
| B. | 12, 0.6, 0.12 |
| C. | 8, 0.6, 0.12 |
| D. | 12, 0.4, 0.08 |
| Answer» C. 8, 0.6, 0.12 | |
| 23. |
Which of the following is never used as an element of industrial resistance thermometer?%! |
| A. | Lead |
| B. | Nickel |
| C. | Copper |
| D. | 30% iron + 70% nickel |
| Answer» B. Nickel | |
| 24. |
Which of the following thermocouples has the least temperature measurement range?%! |
| A. | Copper-constantan |
| B. | Chromel-alumel |
| C. | Platinum-platinum/rhodium |
| D. | Iron-constantan |
| Answer» B. Chromel-alumel | |
| 25. |
For measuring the temperature of a red hot furnace, which is the most suitable instrument?%! |
| A. | Platinum resistance thermometer |
| B. | Thermocouple |
| C. | Optical pyrometer |
| D. | Bimetallic thermometer |
| Answer» D. Bimetallic thermometer | |
| 26. |
Compositional analysis of flue gas coming out of a furnace in respect of O‚ÇÇ and CO‚ÇÇ% can be continuously done by a/an%! |
| A. | Orsat apparatus |
| B. | Thermal conductivity cell |
| C. | Zirconia probe |
| D. | Chromatograph |
| Answer» C. Zirconia probe | |
| 27. |
Which of the following relates the emf. generated in a single homogeneous wire to the temperature difference?%! |
| A. | Peltier effect |
| B. | Thomson effect |
| C. | Seebeck effect |
| D. | None of these |
| Answer» C. Seebeck effect | |
| 28. |
The transfer function for a P-D controller is%! |
| A. | Kc(1+τD s) |
| B. | Kc(1 +1/τD s) |
| C. | Kc τD s |
| D. | Kc/τD s |
| Answer» B. Kc(1 +1/≈ì√ëD s) | |
| 29. |
The thermal emf-temperature relationship of most thermocouples is%! |
| A. | Linear |
| B. | Parabolic |
| C. | Exponential |
| D. | Square root |
| Answer» C. Exponential | |
| 30. |
Which of the following is not a composition measuring instrument?%! |
| A. | Thermal conductivity cell |
| B. | Mass spectrometer |
| C. | Polarograph |
| D. | Hot wire anemometer |
| Answer» E. | |
| 31. |
pH meter has%! |
| A. | One cell |
| B. | Two cells |
| C. | Three cells |
| D. | No cell |
| Answer» C. Three cells | |
| 32. |
Emf generated in a thermocouple depends on the temperature%! |
| A. | Of cold junction only |
| B. | Of hot junction only |
| C. | Difference between hot and cold junctions |
| D. | Difference between cold junction and atmospheric temperature |
| Answer» D. Difference between cold junction and atmospheric temperature | |
| 33. |
Working principle of mercury in glass thermometer is based on volumetric expansion of mercury with increase in temperature. Which of the following undergoes minimum volumetric expansion for a given temperature change?%! |
| A. | Water |
| B. | Mercury |
| C. | Methyl alcohal |
| D. | Carbon-tetrachloride |
| Answer» C. Methyl alcohal | |
| 34. |
Which of the following is an undesirable dynamic characteristic of an instrument?%! |
| A. | Reproducibility |
| B. | Dead zone |
| C. | Time lag |
| D. | Static error |
| Answer» D. Static error | |
| 35. |
A mercury thermometer can not be used to measure the temperature below the freezing point of mercury, which is __________ °C.%! |
| A. | -38.9 |
| B. | -11.9 |
| C. | -60.9 |
| D. | -80.9 |
| Answer» B. -11.9 | |
| 36. |
Which of the following thermocouples is incapable of measuring sub-zero (i.e., < 0°C) temperature?%! |
| A. | Chromel-alumel |
| B. | Iron-constantan |
| C. | Platinum-platinum + rhodium |
| D. | Copper-constantan |
| Answer» D. Copper-constantan | |
| 37. |
*$_The thermal emf-temperature relationship of most thermocouples is? |
| A. | Linear |
| B. | Parabolic |
| C. | Exponential |
| D. | Square root |
| Answer» C. Exponential | |
| 38. |
*$_The transfer function for a P-D controller is? |
| A. | Kc(1+τD s) |
| B. | Kc(1 +1/τD s) |
| C. | Kc τD s |
| D. | Kc/τD s |
| Answer» B. Kc(1 +1/≈ì√ëD s) | |
| 39. |
*$_The __________ of a vapor pressure thermometer is a secondary element.? |
| A. | Pointer |
| B. | Bourdon tube |
| C. | Bulb |
| D. | None ofthese |
| Answer» C. Bulb | |
| 40. |
*$_Which of the following relates the emf. generated in a single homogeneous wire to the temperature difference?? |
| A. | Peltier effect |
| B. | Thomson effect |
| C. | Seebeck effect |
| D. | None of these |
| Answer» C. Seebeck effect | |
| 41. |
*$_Compositional analysis of flue gas coming out of a furnace in respect of O‚ÇÇ and CO‚ÇÇ% can be continuously done by a/an? |
| A. | Orsat apparatus |
| B. | Thermal conductivity cell |
| C. | Zirconia probe |
| D. | Chromatograph |
| Answer» C. Zirconia probe | |
| 42. |
*$_In a shell and tube heat exchanger, the flow rate of heating/cooling fluid is the __________ variable.? |
| A. | Load |
| B. | Controlled |
| C. | Manipulated |
| D. | None of these |
| Answer» D. None of these | |
| 43. |
*$_Which of the following thermocouple materials does not contain nickel?? |
| A. | Alumel |
| B. | Chromel |
| C. | Constantan |
| D. | None of these |
| Answer» E. | |
| 44. |
*$_Which of the following flow-metering instru-ments is an areameter?? |
| A. | Venturimeter |
| B. | Rotameter |
| C. | Pitot tube |
| D. | Hot wire anemometer |
| Answer» C. Pitot tube | |
| 45. |
*$_For two non-interacting first order systems connected in series, the overall transfer function is the __________ of the individual transfer functions.? |
| A. | Product |
| B. | Ratio |
| C. | Sum |
| D. | Difference |
| Answer» B. Ratio | |
| 46. |
*$_Zirconia probe is used for the measurement of? |
| A. | Humidity of air |
| B. | % CO‚ÇÇ in flue gas |
| C. | % O‚ÇÇ in flue gas |
| D. | Speed of a submarine |
| Answer» D. Speed of a submarine | |
| 47. |
*$_Relationship between absorption/evolution of heat at the thermocouple junctions and the current flow in the circuit is given by __________ effect.? |
| A. | Peltier |
| B. | Thomson |
| C. | Seebeck |
| D. | None of these |
| Answer» B. Thomson | |
| 48. |
*$_Sub-zero temperature (< 0°C) can be measured by a constant volume gas thermometer employing? |
| A. | Helium |
| B. | Nitrogen |
| C. | Hydrogen |
| D. | None of these |
| Answer» B. Nitrogen | |
| 49. |
*$_The transfer function of a pure dead time system with dead time τd is? |
| A. | 1/(τds + 1) |
| B. | Τds + 1 |
| C. | E-τds |
| D. | Eτds |
| Answer» D. E≈ì√ëds | |
| 50. |
*$_The function of a transducer is to? |
| A. | Modify the input signal |
| B. | Amplify the input signal |
| C. | Convert the primary signal into a more useful quantity, usually an electric impulse |
| D. | Codify/decodify the input signal |
| Answer» D. Codify/decodify the input signal | |