Process control and measurement Quiz Leave a Comment / By Sivaranjith / March 8, 2018 Welcome to your Quiz.This quiz is about Process control and Instrumentation. it contains 20 questions 1. Load cells are used for the measurement of stress weight velocity strain 2. Dilute wine was used as a thermometric liquid initially to develop temperature scale. First emperical temperature scale developed was the __________ scale. Kelvin Reaumer Centigrade Farenhite 3. The __________ of a vapor pressure thermometer is a functioning element. bulb pointer bourdon tube none of these 4. Thermistor, which has high-temperature co-efficient of resistivity, is used as the sensing element in resistance thermometer. It is a/an solid semi-conductor liquid semi-conductor conductor insulator 5. The operation of a rotameter is based on pressure drop across a nozzle. variable flow area. rotation of a turbine pressure at a stagnation point 6. Which of the following is not the triple point of water? 32°R 492°R 273°K 7. A negative gain margin expressed in decibels means a/an __________ system. Unstable stable Critically damped None of the above 8. Which of the following relates the emf. generated in a single homogeneous wire to the temperature difference? Thomson effect Seebeck effect Peltier effect none of these 9. The temperature of tempering oil baths maintained at 400°C during heat treatment of steel is measured by a/an __________ thermocouple. iron-constantan chromel-alumel platinum-platinum/rhodium None of these 10. Pick out the first order system from among the following. Damped vibrator. Mercury in glass thermometer kept in boiling water. Interacting system of two tanks in series. Non-interacting system of two tanks in series. 11. Which of the following temperature measuring instruments need not touch the object whose temperature is being measured? Filled system thermometer Mercury in glass thermometer Radiation/infrared pyrometer Thermo electric pyrometer 12. The closed-loop pole of a stable second order system could be one real positive and the other real negative. complex conjugate with positive real parts. both real and negative. both real and positive. 13. Typical specifications for design stipulates the gain margin and phase margin to be respectively > 1.7 and > 30° 30° < 1.7 and < 30° > 1.7 and < 30° 14. Which of the following is an undesirable dynamic characteristic of an instrument? Dead zone Reproducibility Static error Time lag 15. Flapper nozzle is used in a/an __________ controller. electronic hydraulic pneumatic none of these 16. Which of the following is a desirable characteristic of an instrument? High fidelity High measuring lag High drift Poor reproducibility 17. Response of a system to a sinusoidal input is called __________ response. unit step impulse frequency none of these 18. Working principle of radiation pyrometer is based on the Kirchoffs law Wien's law Stafan-Boltzman law Seebeck effect 19. Which of the following is the dynamic characteristics of an instrument? Sensitivity Dead zone Reproducibility Fidelity 20. Smoke density of the flue gas going out of the chimney is measured by a thermal conductivity meter photo electric cell polarograph chromatograph Time's up
