Chemical Engineering - Process Control and Instrumentation

21. 

Thermistors are used in __________ devices.

A. voltage measuring
B. temperature measuring
C. temperature compensating
D. both(b)&(c)

Answer: Option D

Explanation:

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22. 

__________ is the static characteristics of an instrument,

A. Response
B. Tine lag
C. Drift
D. dynamic error

Answer: Option C

Explanation:

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23. 

Phase lag of the frequency response of a second order system to a sinusoidal forcing function

A. is 30°
B. is 90° at the most
C. approaches 180° asymptotically
D. is 120°

Answer: Option C

Explanation:

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24. 

Dead zone in an instrument must be less than __________ percent of the scale.

A. 0.2
B. 1.5
C. 4
D. 8

Answer: Option A

Explanation:

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25. 

Emission spectroscopy is used for

A. solids and metal analysis.
B. determining water purity.
C. determination of CO2 in gases.
D. NOxdetermination.

Answer: Option A

Explanation:

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