Process Control and Instrumentation problems
- 1. Load cells are used for the measurement of
Options- A. stress
- B. weight
- C. strain
- D. velocity Discuss
Correct Answer: weight
- 2. The symbol for "capillary line" in instrumentation diagram is
Options- A.
- B.
- C.
- D.
Discuss
Correct Answer:
- 3. The __________ of a vapor pressure thermometer is a functioning element.
Options- A. pointer
- B. bourdon tube
- C. bulb
- D. none of these Discuss
Correct Answer: pointer
- 4. For an input forcing function, X(t) = 2t2, the Laplace transform of this function is
Options- A. 2/s2
- B. 4/s2
- C. 2/s3
- D. 4/s3 Discuss
Correct Answer: 4/s3
- 5. Temperature measuring instruments are standardised mostly with __________ points of pure substances.
Options- A. melting
- B. boiling
- C. both (a) & (b)
- D. neither (a) nor (b) Discuss
Correct Answer: both (a) & (b)
- 6. Pick out the one which is a first order instrument.
Options- A. Mercury in glass thermometer (without any covering or air gap).
- B. Bare metallic thermometer.
- C. Bare vapor pressure thermometer.
- D. All (a), (b) and (c). Discuss
Correct Answer: All (a), (b) and (c).
- 7. In a shell and tube heat exchanger, the flow rate of heating/cooling fluid is the __________ variable.
Options- A. load
- B. controlled
- C. manipulated
- D. none of these Discuss
Correct Answer: manipulated
- 8. Typical specifications for design stipulates the gain margin and phase margin to be respectively
Options- A. > 1.7 and > 30°
- B. < 1.7 and > 30°
- C. < 1.7 and < 30°
- D. > 1.7 and < 30° Discuss
Correct Answer: > 1.7 and > 30°
- 9. __________ is undesirable in thermocouples used in industries,
Options- A. Linear relation of emf to temperature
- B. Corrosion resistance
- C. Oxidation resistance
- D. Non-linear relation of emf to temperature Discuss
Correct Answer: Non-linear relation of emf to temperature
- 10. Pick out the first order system from among the following.
Options- A. Damped vibrator.
- B. Mercury in glass thermometer kept in boiling water.
- C. Interacting system of two tanks in series.
- D. Non-interacting system of two tanks in series. Discuss
Correct Answer: Mercury in glass thermometer kept in boiling water.
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