Process Control and Instrumentation problems
- 1. A pyranometer is an instrument used for measuring the
Options- A. beam radiation.
- B. global radiation.
- C. bright sunshine period.
- D. none of these. Discuss
Correct Answer: global radiation.
- 2. An aneroid barometer measures the __________ pressure.
Options- A. atmospheric
- B. absolute
- C. vacuum
- D. gage Discuss
Correct Answer: absolute
- 3. Which of the following does not figure in the list of seven substances selected for international temperature scale?
Options- A. Ice (F.P) and steam (B.P)
- B. Oxygen and sulphur (B.P)
- C. Antimony and silver (F.P)
- D. Zinc (B.P) and mercury (F.P) Discuss
Correct Answer: Zinc (B.P) and mercury (F.P)
- 4. Working principle of mercury in glass thermometer is based on volumetric expansion of mercury with increase in temperature. Which of the following undergoes minimum volumetric expansion for a given temperature change?
Options- A. Water
- B. Mercury
- C. Methyl alcohal
- D. Carbon-tetrachloride Discuss
Correct Answer: Mercury
- 5. Very low pressure is expressed in microns(?), which is equal to __________ mm of Hg coloumn (absolute) at 0°C.
Options- A. 0.0001
- B. 0.001
- C. 0.01
- D. 0.1 Discuss
Correct Answer: 0.001
- 6. Mercury thermometer can be used to measure the temperature upto __________ °C.
Options- A. 100
- B. 250
- C. 350
- D. 750 Discuss
Correct Answer: 350
- 7. Bourdon gauges are used for measuring pressure (kg/cm2 )
Options- A. < atmospheric
- B. > 2 (gauge)
- C. < 2 (gauge)
- D. > 10 (absolute) Discuss
Correct Answer: > 2 (gauge)
- 8. All the thermocouples used for temperature measurement use dissimilar metal
Options- A. strips
- B. bars
- C. wires
- D. beads Discuss
Correct Answer: wires
- 9. The time constant of a unity gain, first order plus time delay process is 5 min. If the phase lag at a frequency of 0.2 rad/min is 60°, then the dead time (in minutes) is
Options- A. 5?/12
- B. ?/6
- C. ?/12
- D. ?/3 Discuss
Correct Answer: 5?/12
- 10. In a second order under damped system, the
Options- A. time required for the response of first reach its ultimate value is called the response time.
- B. overshoot (which is a measure of how much the response exceeds the ultimate value) increase with the decrease of damping co-efficient e.
- C. decay ratio (which is the ratio of the sizes of successive peaks) is equal to the reciprocal of overshoot.
- D. characteristics of a step response is represented by
Discuss
Correct Answer: overshoot (which is a measure of how much the response exceeds the ultimate value) increase with the decrease of damping co-efficient e.
More in Chemical Engineering:
Programming
Copyright ©CuriousTab. All rights reserved.