Chemical Engineering - Process Control and Instrumentation

21. 

In second order underdamped system,

A. decay ratio = overshoot
B. decay ratio = (overshoot)2
C. overshoot increases for increasing damping co-efficient.
D. large damping co-efficient means smaller damping.

Answer: Option B

Explanation:

No answer description available for this question. Let us discuss.

22. 

Dome temperature of blast furnace stove is most accurately measured by a

A. radiation pyrometer.
B. platinum-platinum/rhodium ther-mocuple.
C. iron-constantan thermocouple.
D. platinum resistance thermometer.

Answer: Option B

Explanation:

No answer description available for this question. Let us discuss.

23. 

Phase lag of the sinusoidal response of a first order system is

A. 120°
B. 30°
C. 180°
D. 90°

Answer: Option D

Explanation:

No answer description available for this question. Let us discuss.

24. 

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

Answer: Option B

Explanation:

No answer description available for this question. Let us discuss.

25. 

Thermal well made of __________ gives the fastest speed of response, while measuring temperature by thermocouples.

A. steel
B. vycor (a glass)
C. nichrome
D. inconel

Answer: Option B

Explanation:

No answer description available for this question. Let us discuss.