Process Instrumentation and Control - Interview Questions | Exam2Win

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46. Proving rings are used to measure :

A. displacement

B. force

C. velocity

D. acceleration

E. shock.

Explanation:

47. A siphon or loop in the connecting pipe is interposed as close as possible to the pressure gauge so that:

A. steam can condense to form a seal of water to fill the tube or bellows at the pressure being measured

B. air or vapour collection is avoided

C. moisture formed in pipe can be drained

D. static head errors are eliminated

E. it acts as dampener and does not pass on pressure variations to sensor.

Explanation:

48. Which of the following thermocouple generates highest e.m.f. for a given temperature :

A. copper-constantan

B. iron-constantan

C. chromel-alumel

D. platinum-rhodium platinum

E. silver-palladium.

Explanation:

49. For measuring temperature in the range of 20 to 600�C, following liquid is used in glass thermometer :

A. mercury

B. alcohol

C. toluene

D. pentane

E. creosote.

Explanation:

50. In case of strain gauge transducers, several strain cycles, and temperature cycles are carried out before making measurements, in order to :

A. increase life

B. enable high repeatable readings

C. eliminate premature failures

D. increase accuracy

E. avoid drift.

Explanation: