Chemical Engineering - Process Control and Instrumentation

16. 

A control system has the following transfer function

The initial value of the corresponding time function is

A. 1
B. 1/8
C. 7/8
D. -1

Answer: Option A

Explanation:

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17. 

For measuring the temperature of a red hot furnace, which is the most suitable instrument ?

A. Platinum resistance thermometer
B. Thermocouple
C. Optical pyrometer
D. Bimetallic thermometer

Answer: Option C

Explanation:

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18. 

Continuous measurement of specific gravity of a liquid is done by

A. hydrometer
B. contact-type electric indicators
C. displacement meter
D. both (a) and (c)

Answer: Option D

Explanation:

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19. 

Stroboscope is used for the measurement of

A. rpm of a flywheel
B. frequency of light
C. depression of freezing point
D. liquid level under pressure

Answer: Option A

Explanation:

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20. 

The root locus plot of the roots of the characteristics equation of a closed loop system having the open loop transfer function will have a definite num-ber of loci for variation of K from 0 to ∞. The number of loci is

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

Answer: Option B

Explanation:

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