Process Instrumentation and Control - Interview Questions | Exam2Win

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61. Local velocity is measured by a :

A. pitot tube

B. venturi tube

C. orifice plate

D. vena contracta device

E. nozzle.

Explanation:

62. Automatic cold junction compensation in thermocouple is provided by :

A. connecting thermocouple wires, in op-position

B. a nickel wire resistance in series with a manganin resistance

C. maintaining cold junction temperature constant by a cooling unit

D. using a photovoltaic cell

E. connecting a dry battery cell in opposi�tion.

Explanation:

63. Pick out the odd flow measuring device among the following :

A. positive displacement type

B. nutating disc type

C. sliding vane type

D. turbine type

E. hydraulic flume.

Explanation:

64. In calibration of temperature sensors by fixed point method, the device is calibrated at:

A. ice point (0�C)

B. steam point (100�C)

C. sulphur point (444.6�C)

D. all of the above

E. none of the above.

Explanation:

65. Pick out false statement about advantages of orifice plates, used for flow measurement :

A. no moving parts

B. long-term reliability

C. highturn-down ratio

D. inexpensive

E. inherently simple in operation.

Explanation: