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# Process Control and Instrumentation Quiz 3

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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 ?