Process Control and Instrumentation problems
- 1. Psychrometer determines the
Options- A. humidity of gases
- B. moisture content of solids
- C. water of crystallisation
- D. hygroscopic nature of solids Discuss
Correct Answer: humidity of gases
- 2. The characteristic equation for the control system with a closed loop transfer function G1/1 + G2 is given by 1 + G2 = 0. The characteristic equation for the control system
Options- A. depends only upon the open loop transfer function.
- B. determines its stability.
- C. is the same for set point or load changes.
- D. all 'a', 'b' & 'c' Discuss
Correct Answer: all 'a', 'b' & 'c'
- 3. The experimental response of the controlled variable y(t) for a step change of magnitude P in the manipulated variable x(t) is shown below :
The appropriate transfer function of the process is
Options- A.
- B.
- C.
- D.
Discuss
Correct Answer:
- 4. What is the ratio of output amplitude to input amplitude for a sinusoidal forcing function in a first order system?
Options- A. 1
- B. >1
- C. < 1
- D. none of these Discuss
Correct Answer: < 1
- 5. Alphatron measures pressure __________ microns.
Options- A. < 1
- B. < 3
- C. > 3
- D. < 0.1 Discuss
Correct Answer: > 3
- 6. Which of the systems having following transfer functions is stable?
Options- A. 1/(s2+ 2)
- B. 1/(s2-2s + 3)
- C. 1/(s2 + 2s + 2)
- D. exp(-20s)/(s2 + 2s-l) Discuss
Correct Answer: 1/(s2 + 2s + 2)
- 7. High temperature of around 2000°C of incandescent gas mantles is measured by a/an
Options- A. specially designed thermocouple.
- B. optical pyrometer.
- C. radiation pyrometer.
- D. none of these. Discuss
Correct Answer: radiation pyrometer.
- 8. The temperature range for which copper resistance thermometer can be used is __________ °C
Options- A. 0 to 150
- B. -200 to 150
- C. 350 to 750
- D. 500 to 900 Discuss
Correct Answer: -200 to 150
- 9. Reset rate is the another term used for __________ time.
Options- A. dead
- B. integral
- C. derivative
- D. none of these Discuss
Correct Answer: integral
- 10. What is the normal percentage of rhodium in platinum + rhodium element used in the thermocouple?
Options- A. 0.1
- B. 3
- C. 13
- D. 29 Discuss
Correct Answer: 13
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