Chemical Engineering - Process Control and Instrumentation

6. 

Which of the following is not a second order instrument ?

A. Mercury in glass thermometer with covering.
B. Bare mercury in glass thermometer.
C. Pressure gauge with one bellow, two tubes and a tank.
D. None of these.

Answer: Option B

Explanation:

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7. 

Small furnace draught is accurately measured by an inclined tube manometer, in which the manometric liquid used most commonly is

A. water
B. carbon tetrachloride
C. paraffin
D. ethylene glycol

Answer: Option C

Explanation:

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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.

A. 50
B. 100
C. 10
D. 1

Answer: Option D

Explanation:

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9. 

A simple pitot tube measures the

A. average velocity
B. maximum velocity
C. point velocity
D. static pressure

Answer: Option D

Explanation:

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10. 

For a feed back control system to be stable, the

A. roots of the characteristic equation should be real.
B. poles of the closed loop transfer function should lie in the left half of the complex plane.
C. Bode plots of the corresponding open loop transfer function should monotoni-cally decrease.
D. poles of the closed loop transfer function should lie in the right half of the complex plane.

Answer: Option B

Explanation:

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