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Process Control and Instrumentation

Continuous measurement of moisture content of paper in paper industry is done by measuring the_________________?

Process Control and Instrumentation /
Continuous measurement of moisture content of paper in paper industry is done by measuring the_________________?

A. Thermal conductivity through the paper
B. Electrical resistance through the paper
C. Magnetic susceptibility
D. None of these

Continuous measurement of moisture content of paper in paper industry is done by measuring the_________________? Read More »

Process Control and Instrumentation

According to Bode stability criterion, a system is unstable, if the open loop frequency response exhibits an amplitude ratio exceeding unity at frequency for which phase lag is_________________?

Process Control and Instrumentation /
According to Bode stability criterion, a system is unstable, if the open loop frequency response exhibits an amplitude ratio exceeding unity at frequency for which phase lag is_________________?

A. 0°
B. 45°
C. 90°
D. 180°

According to Bode stability criterion, a system is unstable, if the open loop frequency response exhibits an amplitude ratio exceeding unity at frequency for which phase lag is_________________? Read More »

Process Control and Instrumentation

Ordinary mercury in glass thermometer is used for measuring temperature upto 120°C. However, for measuring higher temperature upto __________ °C, thermometer is made by filling nitrogen under pressure above the mercury, which stops the evaporation of mercury and reduces the chance of broken thread of mercury?

Process Control and Instrumentation /
Ordinary mercury in glass thermometer is used for measuring temperature upto 120°C. However, for measuring higher temperature upto __________ °C, thermometer is made by filling nitrogen under pressure above the mercury, which stops the evaporation of mercury and reduces the chance of broken thread of mercury?

A. 250
B. 350
C. 550
D. 700

Ordinary mercury in glass thermometer is used for measuring temperature upto 120°C. However, for measuring higher temperature upto __________ °C, thermometer is made by filling nitrogen under pressure above the mercury, which stops the evaporation of mercury and reduces the chance of broken thread of mercury? Read More »

Process Control and Instrumentation

Which of the following is not suitable for measuring the temperature of a red hot object in the range of 800 – 1600°C ?

Process Control and Instrumentation /
Which of the following is not suitable for measuring the temperature of a red hot object in the range of 800 – 1600°C ?

A. Optical pyrometer
B. Radiation pyrometer
C. Photoelectric pyrometer
D. Thermocouples

Which of the following is not suitable for measuring the temperature of a red hot object in the range of 800 – 1600°C ? Read More »

Process Control and Instrumentation