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Process Control and Instrumentation MCQs

Chemical Engineering Objective Questions

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57. Thermisters which have a very high temperature co-efficient of resistivity belong to the class of solid called
A. Dielectrics
B. Insulators
C. Semi conductors
D. Conductors
Discussion
58. A manometer measures the __________ pressure.
A. Atmospheric
B. Absolute
C. Gauge
D. None of these
Discussion
59. Pick out the wrong statement.
A. O2, NO and NO2 exhibit paramagnetic properties as a result of unpaired electrons
B. CO2 is the strongest paramagnetic gas
C. Paramagnetic susceptibility of gases decreases with temperature
D. Paramagnetic susceptibility of gases permits the measurement of their concentration
Discussion
60. Phase margin is equal to
A. 180° - phase lag
B. Phase lag - 180°
C. Phase lag + 180°
D. Phase lag + 90°
Discussion
61. Zirconia probe is used for the measurement of
A. Humidity of air
B. % CO2 in flue gas
C. % O2 in flue gas
D. Speed of a submarine
Discussion
62. Emf developed by a thermocouple while measuring a temperature of 400°C is 22 mV. The type of thermocouple used is
A. Chromel-alumel
B. Iron-constantan
C. Platinum-rhodium
D. Platinum-platinum+rhyodium
Discussion
63. Magnetic flowmeters are generally not used for the velocity/flow measurement of hydrocarbons due to their
A. Low thermal conductivity
B. Low electrical conductivity
C. High viscosity index
D. Low flash point
Discussion

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