Which of the following is a desirable characteristic of an instrument?
A. High drift
B. High fidelity
C. High measuring lag
D. Poor reproducibility
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__________ is the static characteristics of an instrument,
A. Response
B. Tine lag
C. Drift
D. Dynamic error
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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
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Photoelectric pyrometers are suitable in the temperature range of __________ °C.
A. 400-1600
B. 800-1600
C. 800-2500
D. 400-1000
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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
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Mercury thermometer is commonly used for low temperature measruement. The freezing point and boiling point of mercury are respectively __________ °C.
A. - 39 and 350
B. - 51 and 439
C. - 79 and 395
D. - 10 and 425
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Load cells are used for the measurement of
A. Stress
B. Weight
C. Strain
D. Velocity
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Thermistors are used in __________ devices.
A. Voltage measuring
B. Temperature measuring
C. Temperature compensating
D. Both B & C
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The amplitude ratio for the sinusoidal response of __________ is < 1.
A. Transportation lag
B. First order system
C. Second order system
D. None of these
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The amplitude ratio for the sinusoidal response of a __________ is 1.
A. First order system
B. Second order system
C. Transportation lag
D. None of these
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__________ is undesirable in thermocouples used in industries,
A. Linear relation of emf to temperature
B. Corrosion resistance
C. Oxidation resistance
D. Non-linear relation of emf to temperature
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The __________ of a vapor pressure thermometer is a primary element.
A. Pointer
B. Bourdon tube
C. Bulb
D. None of these
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Polarisation of light forms the working principle of a
A. Polarimeter
B. Polarograph
C. Chromatograph
D. Spectrometer
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A constant volume gas thermometer employing __________ is used to measure sub-zero (i.e., < 0° C) temperature.
A. Helium
B. Hydrogen
C. Nitrogen
D. None of these
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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
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Routh test
A. Criterion provides information about the actual location of roots
B. Cannot be used to test the stability of a control system containing transportation lag
C. Criterion is not applicable to systems with polynomial characteristic equation
D. Can not determine as to how many roots of the characteristics equation have positive real roots
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What is the dynamic error in a critically damped second order instrument for a ramp input (AT)?
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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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Liquid levels in autocalves are measued by
A. Simple float
B. Differential float type manometer
C. Glass gauge
D. None of these
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__________ stability method uses open loop transfer function.
A. Nyquist
B. Mikhalov
C. Ruth
D. None of these
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