Process Instrumentation and Control - Interview Questions | Exam2Win

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56. Dall tube is another variation of :

A. orifice plate

B. nozzle

C. venturi tube

D. rotameter

E. pitot-tube.

Explanation:

57. Which of the following flow meter maintains a constant pressure differential but varies the orifice area with flow :

A. Ledoux bell

B. variable area

C. straightening vane

D. variable head

E. vane-type.

Explanation:

58. Pick up correct statement about calibration of temperature sensors by comparison method using liquid bath :

A. water is used for temperatures from 0 to I00�C

B. special grade of paraffin oil is used for temperatures between 100 and 200�C

C. For temperature between 200 and 600�C, a mixture of sodium nitrate and potassium nitrate is used

D. all of above are true

E. none of above is true.

Explanation:

59. Flow in open channels is measured by using :

A. nozzle

B. orifice plate

C. propeller

D. weir

E. vortex-shedding meter.

Explanation:

60. The flow error in case of normal nozzles is of the order of :

A. 0.1%

B. 0.2%

C. 0.5%

D. 1%

E. 2%.

Explanation: