Chemical Engineering - Process Control and Instrumentation
Exercise :: Process Control and Instrumentation - Section 5
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:
2.
Mercury manometer (U-tube type) exemplifies a __________ order system.
Answer: Option C
Explanation:
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:
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:
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?
Answer: Option B
Explanation:
