Discussion
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- Question
Cascade control means
Options- A. feed forward control.
- B. more than one feed-back loop.
- C. on-off control.
- D. one feed-back loop.
- Correct Answer
- more than one feed-back loop.
- 1. Which of the following shows maximum dip effect (indicating reverse direction of temperature change)?
Options- A. Mercury thermometer
- B. Radiation pyrometer
- C. Bimetallic thermometer
- D. Thermocouple Discuss
- 2. Response of a linear control system for a change in set point is called
Options- A. frequency response
- B. transient response
- C. servo problem
- D. regulator problem Discuss
- 3. Find the ultimate gain and frequency for a proportional controller in the case of a process having the transfer function Gp(s) = 1/(4s + 1)(2s + 1)(s + 1).
Options- A. w = 1/14, Kc = 45/714
- B. w = 7/6, Kc = 46/3
- C. w = 1, Kc = 13
- D. w = 7/8, Kc = 45/4 Discuss
- 4. In a shell and tube heat exchanger, the outlet temperature of heating/cooling fluid is the __________ variable.
Options- A. load
- B. manipulated
- C. controlled
- D. none of these Discuss
- 5. Hot wire anemometer is used for the measurement of
Options- A. flow rates of fluids.
- B. flow rates of granular solids.
- C. very high temperature.
- D. thermal conductivity of gases. Discuss
- 6. Meleoid gauge measures the __________ pressure.
Options- A. positive
- B. sub-atmospheric
- C. very high
- D. atmospheric Discuss
- 7. Phase margin is equal to
Options- A. 180° - phase lag
- B. phase lag - 180°
- C. phase lag + 180°
- D. phase lag + 90° Discuss
- 8. Maximum differential pressure in liquid manometer is __________ psi.
Options- A. 20
- B. 30
- C. 40
- D. 50 Discuss
- 9. What is the Laplace transform of impulse input having magnitude 'X'?
Options- A. X
- B. X2
- C. 1/X
- D. 1 Discuss
- 10. Which of the following is not classified as a thermo electric pyrometer?
Options- A. Resistance thermometer.
- B. Thermocouple.
- C. Optical pyrometer (disappearing filament type)
- D. Radiation pyrometer Discuss
Process Control and Instrumentation problems
Search Results
Correct Answer: Mercury thermometer
Correct Answer: servo problem
Correct Answer: w = 7/6, Kc = 46/3
Correct Answer: controlled
Correct Answer: flow rates of fluids.
Correct Answer: sub-atmospheric
Correct Answer: 180° - phase lag
Correct Answer: 30
Correct Answer: 1
Correct Answer: Optical pyrometer (disappearing filament type)
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