Process Control and Instrumentation problems
- 1. Pick out the wrong statement.
Options- A. O2, NO and NO2 exhibit paramagnetic properties as a result of unpaired electrons.
- B. CO2 is the strongest paramagnetic gas.
- C. Paramagnetic susceptibility of gases decreases with temperature.
- D. Paramagnetic susceptibility of gases permits the measurement of their concentration. Discuss
Correct Answer: CO2 is the strongest paramagnetic gas.
- 2. The closed loop pole of a stable second order system could be
Options- A. both real and positive.
- B. complex conjugate with positive real parts.
- C. both real and negative.
- D. one real positive and the other real negative. Discuss
Correct Answer: both real and negative.
- 3. Working principle of radiation pyrometer is based on the
Options- A. Wien's law
- B. Kirchoffs law
- C. Stafan-Boltzman law
- D. Seebeck effect Discuss
Correct Answer: Stafan-Boltzman law
- 4. A magnetic flowmeter is
Options- A. based on the principle of Faraday's law.
- B. capable of measuring the flow rate of slurries and electrolytes.
- C. based on the linear relationship between the fluid flow rate and the induced voltage.
- D. all (a), (b) and (c). Discuss
Correct Answer: all (a), (b) and (c).
- 5. In a single tank system, the transfer function of level to inlet flow rate is
Options- A. R/TS
- B. R/(TS + 1)
- C. l(TS + l)
- D. 1/TS Discuss
Correct Answer: R/(TS + 1)
- 6. Volumetric expansion is the working principle of the __________ thermometers.
Options- A. mercury in glass
- B. constant volume gas
- C. vapor pressure
- D. bimetallic Discuss
Correct Answer: mercury in glass
- 7. Nichol's chart deals with
Options- A. A.R. vs. phase lag of first order.
- B. A.R. vs. phase lag of second order.
- C. closed loop values vs. open loop values.
- D. frequency response values of controllers. Discuss
Correct Answer: closed loop values vs. open loop values.
- 8. Compositional analysis of __________ is done using mass spectrometer.
Options- A. an isotope
- B. natural gas
- C. a solid
- D. an alloy Discuss
Correct Answer: an isotope
- 9. The maximum service temperature for fibre glass used as thermocouple wire insulation material is __________ °C.
Options- A. 250
- B. 500
- C. 750
- D. 1000 Discuss
Correct Answer: 500
- 10. The operation of a rotameter is based on
Options- A. variable flow area.
- B. rotation of a turbine.
- C. pressure drop across a nozzle.
- D. pressure at a stagnation point. Discuss
Correct Answer: variable flow area.
More in Chemical Engineering:
Programming
Copyright ©CuriousTab. All rights reserved.