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Process Control and Instrumentation

Which of the following thermocouples will give the highest output for the same value of hot and cold junction temperature ?

Which of the following thermocouples will give the highest output for the same value of hot and cold junction temperature ?

A. Platinum-platinum + rhodium
B. Iron-constantan
C. Chromel-constantan
D. All will give the same output

Which of the following thermocouples will give the highest output for the same value of hot and cold junction temperature ? Read More »

Process Control and Instrumentation

For a feed back control system to be stable, the _________________?

For a feed back control system to be stable, the _________________?

A. Roots of the characteristic equation should be real
B. Poles of the closed loop transfer function should lie in the left half of the complex plane
C. Bode plots of the corresponding open loop transfer function should monotonically decrease
D. Poles of the closed loop transfer function should lie in the right half of the complex plane

For a feed back control system to be stable, the _________________? Read More »

Process Control and Instrumentation

The ____________ of the fluid contained in the temperature sensing element (i.e., bulb) of filled system thermometers changes with change in temperature ?

The ____________ of the fluid contained in the temperature sensing element (i.e., bulb) of filled system thermometers changes with change in temperature ?

A. Pressure
B. Volume
C. Viscosity
D. All A., B. and C.

The ____________ of the fluid contained in the temperature sensing element (i.e., bulb) of filled system thermometers changes with change in temperature ? Read More »

Process Control and Instrumentation

Thermistor, which has high temperature co-efficient of resistivity, is used as the sensing element in resistance thermometer. It is a/an ?

Thermistor, which has high temperature co-efficient of resistivity, is used as the sensing element in resistance thermometer. It is a/an ?

A. Insulator
B. Conductor
C. Solid semi-conductor
D. Liquid semi-conductor

Thermistor, which has high temperature co-efficient of resistivity, is used as the sensing element in resistance thermometer. It is a/an ? Read More »

Process Control and Instrumentation

Which of the following temperature measuring instruments need not touch the object whose temperature is being measured ?

Which of the following temperature measuring instruments need not touch the object whose temperature is being measured ?

A. Radiation/infrared pyrometer
B. Filled system thermometer
C. Mercury in glass thermometer
D. Thermo electric pyrometer

Which of the following temperature measuring instruments need not touch the object whose temperature is being measured ? Read More »

Process Control and Instrumentation