Process Instrumentation and Control - Interview Questions | Exam2Win

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36. The development of following element has improved the reliability and the response action of low pressure gauges :

A. diaphragm

B. capsule

C. bourdon

D. ring balance

E. all of the above.

Explanation:

37. The deflection of center of capsule (formed by circumferential welding of two diaphragms) is proportional to :

A. active diameter of diaphragm (D)

B. D

C. D2

D. D3

E. D4

Explanation:

38. The resistance of strain gauge grid used in pressure transducers is of the order of :

A. 0.1 to 1 ohm

B. 1 to 10 ohm

C. 10 to 100 ohm

D. 100 to 2000 ohm

E. 2000 to 105 ohm

Explanation:

39. Which of the following have relatively large and negative temperature coefficients of resistance :

A. radiation pyrometers

B. optical pyrometers

C. thermistors

D. platinum resistance detectors

E. thermocouples.

Explanation:

40. Protective coating by a suitable cover are applied over strain gauge in order to protect it against:

A. temperature rise

B. dust and dirt

C. moisture

D. ageing

E. shorting by conductive contact.

Explanation: