Process Control and Instrumentation Quiz 4

1 / 50

**Process degree of freedom indicates ________ number of controllers to be used?**

2 / 50

**Response of a system to a sinusoidal input is called ______ response?**

3 / 50

**Starting temperature of optical radiation pyrometer is _______ ?C?**

4 / 50

**The _____ of the fluid contained in the temperature sensing element (i.e., bulb) of filled system thermometers changes with change in temperature ?**

5 / 50

**The closed loop pole of a stable second order system could be________?**

6 / 50

**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__________?**

7 / 50

**The _____ of a vapor pressure thermometer is a secondary element ?**

8 / 50

**The frequency response of a dynamic element shows a constant magnitude ratio at all frequencies. The element exhibits a negative phase shift at all frequencies. The absolute value of the phase shift increases linearly with frequency. The element has the transfer function ?**

9 / 50

**Relationship between absorption/evolution of heat at the thermocouple junctions and the current flow in the circuit is given by ______ effect?**

10 / 50

**Silver point temperature is _______ ?C?**

11 / 50

**The inverse Laplace transform of the function f(S) = 1/S (1 + S) is__________?**

12 / 50

**Stabilising time for the controllers is the time required for the response to reach ______ percent of its ultimate value?**

13 / 50

**Resistance of a gas in a vessel is given by (where, P = pressure, V = volume of the vessel, n = no. of moles of the gas, R = gas constant) ?**

14 / 50

**The amplitude ratio for the sinusoidal response of __________ is < 1?**

15 / 50

**Suppose that the gain, time constant and dead time of a process with the following transfer function: Gc(s) = 10 exp( ? 0.1s)/(0.5s + 1) are known with a possible error of ? 20% of their values. The largest permissible gain Kc of a proportional controller needs to be calculated below taking the values of process gain, time constant and dead time as_________?**

16 / 50

**Small furnace draught is accurately measured by an inclined tube manometer, in which the manometric liquid used most commonly is ___________?**

17 / 50

**Routh test__________?**

18 / 50

**The frequency response of a first order system, has a phase shift with lower and upper bounds given by_________?**

19 / 50

**Strain gage uses an electrical conductor wire, which when elastically stretched increases in length and reduces in diameter. Both these dimensional changes result in _____ in the electrical resistance of the wire ?**

20 / 50

**Strain gage pressure transducers are used to measure ______ pressures?**

21 / 50

**Radiation thermometer cannot measure the temperature _____?**

22 / 50

**The level of a liquid under pressure can be determined using_____?**

23 / 50

**Radiation pyrometers as compared to thermocouples______?**

24 / 50

**Reference points i.e., ice point and steam point in Reaumer temperature scale are respectively__________?**

25 / 50

**Response of a linear control system for a change in set point is called ___________?**

26 / 50

**Smoke density of the flue gas going out of the chimney is measured by a ___________?**

27 / 50

**Sub-zero temperature (< 0?C) can be measured by a constant volume gas thermometer employing ?**

28 / 50

**Temperature of ______ cannot be measured by an optical or radiation pyrometer?**

29 / 50

**The _______ of a vapor pressure thermometer is a primary element?**

30 / 50

**Reset rate is the another term used for _____ time?**

31 / 50

**Temperature of molten pig iron (1450?C) and molten slag (1500?C) flowing out of a blast furnace is measured by a/an________?**

32 / 50

**The frequency at which maximum amplitude ratio is attained is called the _______ frequency?**

33 / 50

**The deflection in diaphragm (which is used as pressure sensor in pneumatic and electronic instruments) is dependent on the metal thickness, its diameter D. and shape & number of corrugations. Its deflection is proportional to________?**

34 / 50

**Select the correct statement from the following?**

35 / 50

**Stroboscope is used for the measurement of __________?**

36 / 50

**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__________?**

37 / 50

**The Laplace transform of exp(at), where a > 0, is defined only for the Laplace parameter, s > a since_______?**

38 / 50

**Routh stability method uses _______ loop transfer function?**

39 / 50

**Temperature measuring instruments are standardised mostly with ______ points of pure substances?**

40 / 50

**The deflection of the free end of the bimetallic strips in a bimetallic thermometer with temperature is nearly___________?**

41 / 50

**Range of hydrogen gas constant volume thermometer is ______ ?C?**

42 / 50

**Temperature control of an exothermic chemical reaction taking place in a CSTR is done with the help of cooling water flowing in a jacket around the reactor. The types of valve and controller action to be recommended are_________?**

43 / 50

**The function of a transducer is to ________ ?**

44 / 50

**Stalagmometer is used for the measurement of___________?**

45 / 50

**The maximum service temperature for fibre glass used as thermocouple wire insulation material is __________ ?C?**

46 / 50

**Stability of a control system containing a transportation lag can be best analysed by________?**

47 / 50

**The ______ of a vapor pressure thermometer is a functioning element?**

48 / 50

**The amplitude ratio for the sinusoidal response of a ______ is 1?**

49 / 50

**Specific gravity of a liquid cannot be measured by a/an ___________?**

50 / 50

**Temperature measurement by optical pyrometer is done above _____ point, which is 1063?C ?**

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