Chemical Engineering - Process Control and Instrumentation

11. 

0n-off control which is a special case of proportional control, has a band width of about __________ percent.

A. 100
B. 75
C. 25
D. 0

Answer: Option D

Explanation:

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12. 

The thermal emf-temperature relationship of most thermocouples is

A. linear
B. parabolic
C. exponential
D. square root

Answer: Option B

Explanation:

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13. 

Which is the strongest paramagnetic gas?

A. CO2
B. O2
C. NO
D. NO2

Answer: Option B

Explanation:

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14. 

In Bode plot, A.R. vs. w is plotted on a/an __________ graph paper.

A. log-lag
B. triangular
C. ordinary
D. semi-log

Answer: Option A

Explanation:

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15. 

A first order system with unity gain and time constant τ is subjected to a sinusoidal input of frequency w = 1/τ. The amplitude ratio for this system is

A. 1
B. 0.5
C. 1/2
D. 0.25

Answer: Option C

Explanation:

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