Chemical Engineering - Process Control and Instrumentation

11. 

A mercury thermometer can not be used to measure the temperature below the freezing point of mercury, which is __________ °C.

A. -38.9
B. -11.9
C. -60.9
D. -80.9

Answer: Option A

Explanation:

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12. 

__________ controller has the maximum stabilising time.

A. P
B. PD
C. PI
D. PID

Answer: Option C

Explanation:

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13. 

Out of the following temperature measuring instruments, the measurement accuracy will be minimum for the

A. mercury in glass thermometer.
B. optical pyrometer.
C. iron-constantan thermocouple.
D. alcohol filled thermometer.

Answer: Option B

Explanation:

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14. 

Stalagmometer is used for the measurement of

A. kinematic viscosity
B. surface tension
C. refractive index
D. optical activity

Answer: Option B

Explanation:

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15. 

The deflection in diaphragm (which is used as pressure sensor in pneumatic and electronic instruments) is dependent on the metal thickness, its diameter (d) and shape & number of corrugations. Its deflection is proportional to

A. d
B. d2
C. d3
D. d4

Answer: Option D

Explanation:

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