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1) A system with a double pole at the origin is unstable since the corresponding term in the time domain________________? a. Is a constant b. Grows exponentially with time c. Grows linearly with time d. Decays linearly with time
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2) Working principle of disappearing filament type optical pyrometer is based on the ________________? a. Wien’s law b. Seebeck effect c. Kirchoff’s law d. Peltier effect
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3) Dilatometer is used to measure __________________? a. Stress b. Strain c. Deflection d. Contraction/expansion due to changes in temperature
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4) 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
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5) pH meter has ____________________? a. One cell b. Two cells c. Three cells d. No cell
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6) Flow rate of those fluids which are insensitive to changes in their density, viscosity or flow velocity profile can be best measured by a ________________? a. Magnetic flowmeter b. Pitot tube c. Flow nozzle type flowmeter d. Turbine flowmeter
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7) 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 alcohol d. Carbon-tetrachloride
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8) Which of the following filled system expansion thermometer has the capability to measure the lowest temperature ? a. Mercury in glass thermometer b. Mercury in steel thermometer c. Alcohol in glass thermometer d. Fused metal (Na or K) in steel thermometer
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9) 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
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10) Which of the following thermocouples can measure the maximum temperature ? a. Platinum-rhodium b. Tungsten-molybdenum c. Chromel-alumel d. Iron-constantan
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11) Optical activity of a solution can be determined using a ___________________? a. Polarimeter b. Polarograph c. Dilatometer d. Refractometer
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12) Strain gage uses an electrical conductor wire, which when elastically stretched increases in length and reduces in diameter. Both these dimensional changes result in ____________ in the electrical resistance of the wire ? a. No change b. Decrease c. Increase d. Exponential decrease
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13) Which of the following is not a composition measuring instrument ? a. Thermal conductivity cell b. Mass spectrometer c. Polarograph d. Hot wire anemometer
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14) Response of a linear control system for a change in set point is called __________________? a. Frequency response b. Transient response c. Servo problem d. Regulator problem
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15) Stroboscope is used for the measurement of _________________? a. Rpm of a flywheel b. Frequency of light c. Depression of freezing point d. Liquid level under pressure
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16) Nickel percentage in invar which is an iron-nickel alloy, and is used as a thermocouple material is __________________? a. 12 b. 36 c. 54 d. 68
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17) Conversion formula for converting amplitude ratio (AR) into decibels is ________________? a. Decibel = 20 log10 (AR) b. Decibel = 20 loge (AR) c. Decibel = 20 log10 (AR)0.5 d. Decibel = 20 loge (AR)0.5
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18) Liquid flow rate in an open channel cannot be measured by a/an __________________? a. Orifice meter b. Cipolletti weir c. Rectangular weir d. V-notch
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19) Temperature of molten pig iron (1450°C) and molten slag (1500°C) flowing out of a blast furnace is measured by a/an_______________? a. Chromel-alumel thermocouple b. Optical pyrometer c. Radiation pyrometer d. Either B. or C.
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20) 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
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