Process Control and Instrumentation problems
- 1. Which of the following thermocouple materials does not contain nickel?
Options- A. Alumel
- B. Chromel
- C. Constantan
- D. None of these. Discuss
Correct Answer: None of these.
- 2. The initial value (t=0) of the unit step response of the transfer function [(s + 1)/(2s + 1)] is
Options- A. 0
- B. 1/2
- C. 1
- D. 2 Discuss
Correct Answer: 1/2
- 3. Which of the following thermometers is not suitable for distant reading upto 60 metres?
Options- A. Vapor pressure thermometer
- B. Mercury in glass thermometer
- C. Constant volume gas thermometer
- D. Resistance thermometer Discuss
Correct Answer: Mercury in glass thermometer
- 4. Liquid flow rate in a small channel is best measured by a/an
Options- A. weir
- B. pitot tube
- C. vane meter
- D. venturimeter Discuss
Correct Answer: pitot tube
- 5. A barometer measures the __________ pressure.
Options- A. absolute
- B. gauge
- C. absolute as well as gauge
- D. dynamic Discuss
Correct Answer: absolute
- 6. Radiation pyrometers as compared to thermocouples
Options- A. has a slower speed of response.
- B. can measure higher temperature.
- C. can't measure the temperature of moving objects.
- D. is more affected by corrosive atmosphere. Discuss
Correct Answer: can measure higher temperature.
- 7. Pick out the wrong statement
Options- A. Proportional controller is normally used for level control in industrial applications.
- B. CSTR can be considered as a distributed parameter system.
- C. Distributed parameter approach gives partial differential equation.
- D. Non-linear behaviour is exemplified by an on-off controller. Discuss
Correct Answer: CSTR can be considered as a distributed parameter system.
- 8. Which of the following filled system expansion thermometer has the capability to measure the lowest temperature?
Options- A. Mercury in glass thermometer
- B. Mercury in steel thermometer
- C. Alcohol in glass thermometer
- D. Fused metal (Na or K) in steel thermometer Discuss
Correct Answer: Alcohol in glass thermometer
- 9. Range of hydrogen gas constant volume themometer is __________ °C.
Options- A. -10 to 20
- B. 0 to 100
- C. 100 - 500
- D. 400 - 1000 Discuss
Correct Answer: 0 to 100
- 10. A sinusoidal variation in the input passing through a linear first order system
Options- A. becomes more oscillatory (frequency increases).
- B. becomes less oscillatory (frequency decreases).
- C. gets amplified (magnitude increases).
- D. gets attenuated (magnitude decreases). Discuss
Correct Answer: gets attenuated (magnitude decreases).
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