Process Control and Instrumentation Quiz 4
1 / 50
Silver point temperature is _______ ?C?
2 / 50
Stabilising time for the controllers is the time required for the response to reach ______ percent of its ultimate value?
3 / 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__________?
4 / 50
The Laplace transform of exp(at), where a > 0, is defined only for the Laplace parameter, s > a since_______?
5 / 50
Relationship between absorption/evolution of heat at the thermocouple junctions and the current flow in the circuit is given by ______ effect?
6 / 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 ?
7 / 50
Temperature of molten pig iron (1450?C) and molten slag (1500?C) flowing out of a blast furnace is measured by a/an________?
8 / 50
Stroboscope is used for the measurement of __________?
9 / 50
The level of a liquid under pressure can be determined using_____?
10 / 50
Response of a system to a sinusoidal input is called ______ response?
11 / 50
Reference points i.e., ice point and steam point in Reaumer temperature scale are respectively__________?
12 / 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 ?
13 / 50
Process degree of freedom indicates ________ number of controllers to be used?
14 / 50
The frequency at which maximum amplitude ratio is attained is called the _______ frequency?
15 / 50
Starting temperature of optical radiation pyrometer is _______ ?C?
16 / 50
The _____ of the fluid contained in the temperature sensing element (i.e., bulb) of filled system thermometers changes with change in temperature ?
17 / 50
Radiation pyrometers as compared to thermocouples______?
18 / 50
The _____ of a vapor pressure thermometer is a secondary element ?
19 / 50
Temperature measurement by optical pyrometer is done above _____ point, which is 1063?C ?
20 / 50
The maximum service temperature for fibre glass used as thermocouple wire insulation material is __________ ?C?
21 / 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_________?
22 / 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) ?
23 / 50
Temperature measuring instruments are standardised mostly with ______ points of pure substances?
24 / 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_________?
25 / 50
The deflection of the free end of the bimetallic strips in a bimetallic thermometer with temperature is nearly___________?
26 / 50
Sub-zero temperature (< 0?C) can be measured by a constant volume gas thermometer employing ?
27 / 50
Smoke density of the flue gas going out of the chimney is measured by a ___________?
28 / 50
Temperature of ______ cannot be measured by an optical or radiation pyrometer?
29 / 50
Select the correct statement from the following?
30 / 50
Reset rate is the another term used for _____ time?
31 / 50
The function of a transducer is to ________ ?
32 / 50
Routh test__________?
33 / 50
Specific gravity of a liquid cannot be measured by a/an ___________?
34 / 50
The amplitude ratio for the sinusoidal response of __________ is < 1?
35 / 50
The closed loop pole of a stable second order system could be________?
36 / 50
Small furnace draught is accurately measured by an inclined tube manometer, in which the manometric liquid used most commonly is ___________?
37 / 50
Routh stability method uses _______ loop transfer function?
38 / 50
Stalagmometer is used for the measurement of___________?
39 / 50
Range of hydrogen gas constant volume thermometer is ______ ?C?
40 / 50
Response of a linear control system for a change in set point is called ___________?
41 / 50
Radiation thermometer cannot measure the temperature _____?
42 / 50
Stability of a control system containing a transportation lag can be best analysed by________?
43 / 50
The amplitude ratio for the sinusoidal response of a ______ is 1?
44 / 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________?
45 / 50
The frequency response of a first order system, has a phase shift with lower and upper bounds given by_________?
46 / 50
The inverse Laplace transform of the function f(S) = 1/S (1 + S) is__________?
47 / 50
The _______ of a vapor pressure thermometer is a primary element?
48 / 50
The ______ of a vapor pressure thermometer is a functioning element?
49 / 50
Strain gage pressure transducers are used to measure ______ pressures?
50 / 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__________?
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