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Chemical Engineering - Process Control and Instrumentation

Exercise : Process Control and Instrumentation - Section 5
6.
Which of the following is not a second order instrument ?
Mercury in glass thermometer with covering.
Bare mercury in glass thermometer.
Pressure gauge with one bellow, two tubes and a tank.
None of these.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
7.
Small furnace draught is accurately measured by an inclined tube manometer, in which the manometric liquid used most commonly is
water
carbon tetrachloride
paraffin
ethylene glycol
Answer: Option
Explanation:
No answer description is available. Let's discuss.
8.
Specific conductance is defined as the reciprocal of resistance in ohms of 1c.c. of liquid at a specified temperature. Its value for distilled water is about __________ micro mho/cm3.
50
100
10
1
Answer: Option
Explanation:
No answer description is available. Let's discuss.
9.
A simple pitot tube measures the
average velocity
maximum velocity
point velocity
static pressure
Answer: Option
Explanation:
No answer description is available. Let's discuss.
10.
For a feed back control system to be stable, the
roots of the characteristic equation should be real.
poles of the closed loop transfer function should lie in the left half of the complex plane.
Bode plots of the corresponding open loop transfer function should monotoni-cally decrease.
poles of the closed loop transfer function should lie in the right half of the complex plane.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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