Discussion
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- Question
The root locus plot of the roots of the characteristics equation of a closed loop system having the open loop transfer function
will have a definite num-ber of loci for variation of K from 0 to ?. The number of loci is
Options- A. 1
- B. 3
- C. 4
- D. 2
- Correct Answer
- 3
- 1. Which of the following can measure temperatures in the range of - 20 to 300°C?
Options- A. Mercury in glass thermometer
- B. Vapor pressure thermometer
- C. Resistance thermometer
- D. None of these. Discuss
- 2. Phase lag of the sinusoidal response of a first order system is
Options- A. 120°
- B. 30°
- C. 180°
- D. 90° Discuss
- 3. Which of the following thermocouples is incapable of measuring sub-zero (i.e., < 0°C) temperature?
Options- A. Chromel-alumel
- B. Iron-constantan
- C. Platinum-platinum + rhodium
- D. Copper-constantan Discuss
- 4. Which is the strongest paramagnetic gas?
Options- A. CO2
- B. O2
- C. NO
- D. NO2 Discuss
- 5. Composition of natural gas is determined by the
Options- A. Haldane apparatus
- B. mass spectrometer
- C. chromatograph
- D. both (b) and (c) Discuss
- 6. For two non-interacting first order systems connected in series, the overall transfer function is the __________ of the individual transfer functions.
Options- A. product
- B. ratio
- C. sum
- D. difference Discuss
- 7. In Bode plot, ? vs ? is plotted on a/an __________ graph paper.
Options- A. log-log
- B. ordinary
- C. semi-log
- D. triangular Discuss
- 8. Pick out the wrong statement.
Options- A. There is no transfer lag for a single first order system.
- B. Stirred tank with a water jacket exemplifies an interacting system.
- C. Transfer lag is a characteristics of all higher order systems (other than first order systems).
- D. Transfer lag decreases as the number of stages decreases. Discuss
- 9. For measuring the temperature of a red hot furnace, which is the most suitable instrument?
Options- A. Platinum resistance thermometer
- B. Thermocouple
- C. Optical pyrometer
- D. Bimetallic thermometer Discuss
- 10. 0n-off control which is a special case of proportional control, has a band width of about __________ percent.
Options- A. 100
- B. 75
- C. 25
- D. 0 Discuss
Process Control and Instrumentation problems
Search Results
Correct Answer: None of these.
Correct Answer: 90°
Correct Answer: Platinum-platinum + rhodium
Correct Answer: O2
Correct Answer: both (b) and (c)
Correct Answer: product
Correct Answer: log-log
Correct Answer: Transfer lag decreases as the number of stages decreases.
Correct Answer: Optical pyrometer
Correct Answer: 0
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