Chemical Engineering - Process Control and Instrumentation

1. 

Time constant is the

A. time taken by the controlled variable to reach 63.2% of its full change.
B. same as transportation lag.
C. same as dead time.
D. time required by the measured variable to reach 63.2% of its ultimate change.

Answer: Option A

Explanation:

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2. 

Mercury manometer (U-tube type) exemplifies a __________ order system.

A. zero
B. first
C. second
D. third

Answer: Option C

Explanation:

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3. 

Emf developed by a thermocouple while measuring a temperature of 400°C is 22 mV. The type of thermocouple used is

A. chromel-alumel
B. iron-constantan
C. platinum-rhodium
D. platinum-platinum+rhyodium

Answer: Option B

Explanation:

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4. 

Bode stability method uses __________ loop transfer function.

A. open
B. closed
C. either (a) or (b)
D. neither (a) nor (b)

Answer: Option A

Explanation:

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5. 

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

Answer: Option B

Explanation:

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