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Chemical Engineering - Process Control and Instrumentation

Exercise : Process Control and Instrumentation - Section 2
41.
Flow rate of those fluids which are insensitive to changes in their density, viscosity or flow velocity profile can be best measured by a
magnetic flowmeter
pitot tube
flow nozzle type flowmeter
turbine flowmeter
Answer: Option
Explanation:
No answer description is available. Let's discuss.
42.
Identify an unbounded input from inputs whose transfer functions are given below
1
1/S
1/S2
1/(S2 + 1)
Answer: Option
Explanation:
No answer description is available. Let's discuss.
43.
"A control system is unstable, if the open loop frequency response exhibits an amplitude ratio exceeding unity at the crossover frequency." This is __________ criterion.
Bode stability
Nyquist
Routh stability
none of these
Answer: Option
Explanation:
No answer description is available. Let's discuss.
44.
Feed forward controller accounts for the __________ changes.
set point
load
both (a) & (b)
neither (a) nor (b)
Answer: Option
Explanation:
No answer description is available. Let's discuss.
45.
Which thermocouple can be used to measure a temperature of around 1400°C ?
Copper-constantan
Aluminium-chromel
Platinum-platinum+rhodium
None of these
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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