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Process Control and Instrumentation

A proportional controller with a gain of Kc is used to control a first order process. The offset will increase, if________________?

Process Control and Instrumentation /
A proportional controller with a gain of Kc is used to control a first order process. The offset will increase, if________________?

A. Kc is reduced
B. Kc is increased
C. Integral control action is introduced
D. Derivative control action is introduced

A proportional controller with a gain of Kc is used to control a first order process. The offset will increase, if________________? Read More »

Process Control and Instrumentation

The unit step response of the transfer function (2s – 1)/[(3s + 1) (4s + 1)] reaches its final steady state asymptotically after _____________?

Process Control and Instrumentation /
The unit step response of the transfer function (2s – 1)/[(3s + 1) (4s + 1)] reaches its final steady state asymptotically after _____________?

A. A monotonic increase
B. A monotonic decrease
C. Initially increasing and then decreasing
D. Increasing decreasing and then increasing

The unit step response of the transfer function (2s – 1)/[(3s + 1) (4s + 1)] reaches its final steady state asymptotically after _____________? Read More »

Process Control and Instrumentation

Emf developed by a thermocouple, while measuring a temperature of 600°C is about 5.5 mV. The type of thermocouple used is_______________?

Process Control and Instrumentation /
Emf developed by a thermocouple, while measuring a temperature of 600°C is about 5.5 mV. The type of thermocouple used is_______________?

A. Chromel-alumel
B. Iron-constantan
C. Platinum-platinum + rhodium
D. Either A., B. or C.

Emf developed by a thermocouple, while measuring a temperature of 600°C is about 5.5 mV. The type of thermocouple used is_______________? Read More »

Process Control and Instrumentation

Working principle of bimetallic thermometers is difference in linear co-efficient of thermal expansion of two strips of different metals welded together. Which of the following has the maximum thermal co-efficient of linear expansion ?

Process Control and Instrumentation /
Working principle of bimetallic thermometers is difference in linear co-efficient of thermal expansion of two strips of different metals welded together. Which of the following has the maximum thermal co-efficient of linear expansion ?

A. Nickel
B. Brass
C. Chromel
D. Invar

Working principle of bimetallic thermometers is difference in linear co-efficient of thermal expansion of two strips of different metals welded together. Which of the following has the maximum thermal co-efficient of linear expansion ? Read More »

Process Control and Instrumentation

The temperature of tempering oil baths maintained at 400°C during heat treatment of steel is measured by a/an _____________ thermocouple?

Process Control and Instrumentation /
The temperature of tempering oil baths maintained at 400°C during heat treatment of steel is measured by a/an _____________ thermocouple?

A. Chromel-alumel
B. Iron-constantan
C. Platinum-platinum/rhodium
D. None of these

The temperature of tempering oil baths maintained at 400°C during heat treatment of steel is measured by a/an _____________ thermocouple? Read More »

Process Control and Instrumentation

The deflection of the free end of the bimetallic strips in a bimetallic thermometer with temperature is nearly__________________?

Process Control and Instrumentation /
The deflection of the free end of the bimetallic strips in a bimetallic thermometer with temperature is nearly__________________?

A. Linear
B. Non-linear
C. Parabolic
D. Hyperbolic

The deflection of the free end of the bimetallic strips in a bimetallic thermometer with temperature is nearly__________________? Read More »

Process Control and Instrumentation