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1) Which of the following can measure temperatures in the range of – 20 to 300°C ? a. Mercury in glass thermometer b. Vapor pressure thermometer c. Resistance thermometer d. None of these
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2) _____________ is an example of distributed parameter system ? a. Tubular reactor b. CSTR c. On-off controller d. None of these
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3) The thermal emf-temperature relationship of most thermocouples is_________________? a. Linear b. Parabolic c. Exponential d. Square root
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4) Which of the following thermocouples has the widest temperature measurement range ? a. Iron-constantan b. Chromel-alumel c. Copper-constantan d. Platinum-platinum/rhodium
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5) In Bode plot, φ vs. ω is plotted on a/an ______________ graph paper? a. log-log b. Ordinary c. Semi-log d. Triangular
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6) Cascade control means _______________? a. Feed forward control b. More than one feed-back loop c. On-off control d. One feed-back loop
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7) What is the normal percentage of rhodium in platinum + rhodium element used in the thermocouple ? a. 0.1 b. 3 c. 13 d. 29
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8) Pick out the most suitable instrument for measuring temperature in the range of-40 to 425°C ? a. Mercury thermometer b. Bimetallic thermometer c. Radiation pyrometer d. None of these
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9) A first order system with a time constant of 1 min is subjected to frequency response analysis. At an input frequency of 1 radian/min, the phase shift is______________? a. 45° b. -90° c. -180° d. -45°
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10) Liquid flow rate in a small channel is best measured by a/an____________________? a. Weir b. Pitot tube c. Vane meter d. Venturimeter
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11) Thermal wells are used in the temperature measurement to____________________? a. Guard against corrosive and oxidising action on thermocouple materials b. Reduce measuring lag c. Increase the fidelity d. Increase the sensitivity
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12) Feed forward controller accounts for the ______________ changes? a. Set point b. Load c. Both A. & B. d. Neither A. nor B.
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13) The open loop transfer function of a process is K [{(s + 1) (s + 4)}/{(s + 2) (s + 3)}]. In the root locus diagram, the poles will be at ___________________? a. -1, -4 b. 1, 4 c. -2, -3 d. 2, 3
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14) Accurate temperature measurement performance of a radiation pyrometer cannot be affected, if the ? a. Enhancement or attenuation of radiation occurs in the sighting path b. Object and surrounding are at almost the same temperature c. Object has varying emissivity d. Object is transparent
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15) Stability of a control system containing a transportation lag can be best analysed by_______________? a. Routh test b. Root locus methods c. Frequency response methods d. None of these
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16) Thermocouple in a thermal well behaves as a true ________________? a. First order system b. Second order system (overdamped) c. Multiple first order system d. Second order system (underdamped)
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17) Number of poles in a system with transfer function 1/(s2 + 2s2 + 1) is ________________? a. 2 b. 5 c. 3 d. 1
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18) Radiation pyrometers as compared to thermocouples____________________? a. Has a slower speed of response b. Can measure higher temperature c. Can’t measure the temperature of moving objects d. Is more affected by corrosive atmosphere
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19) Bourdon gauges are used for measuring pressure (kg/cm2) ? a. < atmospheric b. > 2 (gauge) c. 10 (absolute)
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20) Thermodynamic Celsius scale of temperature measurement is________________? a. Defined on the basis of melting point of ice and evaporation temperature of water vapor b. Defined on the basis of melting point of ice and condensation temperature of water vapor c. Having an interval of 100° between ice point to steam point d. Both B. and C.
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