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Process Control and Instrumentation

Stability of a control system containing a transportation lag can be best analysed by_______________?

August 24, 2021March 5, 2019 by admin
Stability of a control system containing a transportation lag can be best analysed by_______________?

A. Routh test
B. Root locus methods
C. Frequency response methods
D. None of these

Categories Process Control and Instrumentation

Accurate temperature measurement performance of a radiation pyrometer cannot be affected, if the ?

August 24, 2021March 5, 2019 by admin
Accurate temperature measurement performance of a radiation pyrometer cannot be affected, if the ?

A. Enhancement or attenuation of radiation occurs in the sighting path
B. Object and surrounding are at almost the same temperature
C. Object has varying emissivity
D. Object is transparent

Categories Process Control and Instrumentation

The open loop transfer function of a process is K [{(s + 1) (s + 4)}/{(s + 2) (s + 3)}]. In the root locus diagram, the poles will be at ___________________?

August 24, 2021March 5, 2019 by admin
The open loop transfer function of a process is K [{(s + 1) (s + 4)}/{(s + 2) (s + 3)}]. In the root locus diagram, the poles will be at ___________________?

A. -1, -4
B. 1, 4
C. -2, -3
D. 2, 3

Categories Process Control and Instrumentation

Feed forward controller accounts for the ______________ changes?

August 24, 2021March 5, 2019 by admin
Feed forward controller accounts for the ______________ changes?

A. Set point
B. Load
C. Both A. & B.
D. Neither A. nor B.

Categories Process Control and Instrumentation

Thermal wells are used in the temperature measurement to____________________?

August 24, 2021March 5, 2019 by admin
Thermal wells are used in the temperature measurement to____________________?

A. Guard against corrosive and oxidising action on thermocouple materials
B. Reduce measuring lag
C. Increase the fidelity
D. Increase the sensitivity

Categories Process Control and Instrumentation

Liquid flow rate in a small channel is best measured by a/an____________________?

August 24, 2021March 5, 2019 by admin
Liquid flow rate in a small channel is best measured by a/an____________________?

A. Weir
B. Pitot tube
C. Vane meter
D. Venturimeter

Categories Process Control and Instrumentation

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______________?

August 24, 2021March 5, 2019 by admin
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______________?

A. 45°
B. -90°
C. -180°
D. -45°

Categories Process Control and Instrumentation

Pick out the most suitable instrument for measuring temperature in the range of-40 to 425°C ?

August 24, 2021March 5, 2019 by admin
Pick out the most suitable instrument for measuring temperature in the range of-40 to 425°C ?

A. Mercury thermometer
B. Bimetallic thermometer
C. Radiation pyrometer
D. None of these

Categories Process Control and Instrumentation

What is the normal percentage of rhodium in platinum + rhodium element used in the thermocouple ?

August 24, 2021March 5, 2019 by admin
What is the normal percentage of rhodium in platinum + rhodium element used in the thermocouple ?

A. 0.1
B. 3
C. 13
D. 29

Categories Process Control and Instrumentation

Cascade control means _______________?

August 24, 2021March 5, 2019 by admin
Cascade control means _______________?

A. Feed forward control
B. More than one feed-back loop
C. On-off control
D. One feed-back loop

Categories Process Control and Instrumentation
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