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Day 2 > Instrumentation > Flashcards

Instrumentation Flashcards

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1
Q

Strongest paramagnetic gas

A

O2

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2
Q

Negative gain margin in decibels means ____ system

A

unstable

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3
Q

Thermistor is a/an

A

solid semi-conductor

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4
Q

Flapper nozzle is used in

A

pneumatic controller

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5
Q

Working principle of radiation pyrometer

A

Stefan Boltzman

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6
Q

Undesirable characteristic of instrument

A

Time Lag

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7
Q

Functioning element of VP thermometer

A

Pointer

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8
Q

Relates emf in a single homogeneous wire to temp difference

A

Thomson Effect

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9
Q

Temperature of tempering oil baths maintained at 400C during heat treatment of steel

A

Iron Constantan

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10
Q

Thermal conductivity measurement

A

CO2 analyzer

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11
Q

Closed loop pole of a stable second order system would be

A

real and negative

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12
Q

Smoke density of flue gas out of the chimney

A

Photoelectric cells

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13
Q

Maximum service temperature for fiber kept in Boiling water

A

500 C

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14
Q

Zirconia probe is used in the measurement of

A

O2 in the flue gas

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15
Q

Compositional analysis of ___ is done using mass spectrometer

A

Isotope

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16
Q

Highest output for the same value of hot, cold junction temperature

A

Chromel-Constantan

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17
Q

Secondary element of VP thermometer

A

Bourdon Tube

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18
Q

Which of the following relates the absorption & evolution of heat at the junctions of a thermocouple to the current flow in the circuit?

A

Peltier effect

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19
Q

The second order system with the transfer functionhas a damping ratio of

A

0.5

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20
Q

In a shell and tube heat exchanger, the flow rate of heating/cooling fluid is the __________ variable.

A

manipulated

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21
Q

Which of the following thermocouples can measure the maximum temperature ?

A

Tungsten-molybdenum

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22
Q

temperature scale assigns 0° to the ‘ice point’ and 80° to the ‘steam point’

A

Reumur

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23
Q

Degree to which an instrument indicates the changes in measured variable without dynamic error is called its

A

Fidelity

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24
Q

Thermistors are made of

A

metal oxides

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25
Thermocouple in a thermal well behaves as a true
Multiple first order system
26
The transfer function for a P-D controller is
Kc(1+τD s)
27
Bode diagram is a plot of
log (AR) vs. log (f) and (Φ) vs. log (f)q
28
Working principle of disappearing filament type optical pyrometer is based on the
Wien's law
29
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.
increase
30
True or False. CSTR can be considered as a distributed parameter system.
False
31
The time constant of a first order process with resistance R and capacitance C is
RC
32
sinusoidal variation in the input passing through a linear first order system
gets attentuated (magnitude decreases)
33
Nitrogen gas constant volume thermometer is suitable for measuring a temperature of __________ °C.
>100
34
Pick out the most suitable instrument for measuring temperature in the range of-40 to 425°C.
Bimetallic thermometer
35
Relationship between absorption/evolution of heat at the thermocouple junctions and the current flow in the circuit is given by __________ effect.
Peltier
36
Configuration of Bourdon spring tube is never made of __________ shape
circular
37
According to Bode stability criterian, a system is unstable, if the open loop frequency response exhibits an amplitude ratio exceeding unity at frequency for which phase lag is1
180 C
38
Measurement of pressure in ammonia reactor is done by
Bourdon tube
39
The fluid used in hydraulic controller is
oil
40
"A control system is unstable, if the open loop frequency response exhibits an amplitude ratio exceeding unity at the crossover frequency." This is __________ criterion.
Bode stability
41
Feed forward controller accounts for the __________ changes.
load
42
Which thermocouple can be used to measure a temperature of around 1400°C
Platinum Platinum/Rhodium
43
Which of the following filled system expansion thermometer has the capability to measure the lowest temperature ?
Alcohol in glass thermometer
44
Which of the following can not measure a temperature of 1600°C ?
Platinum resistance thermometer
45
The temperature range for which copper resistance thermometer can be used is __________ °C
-200 to 150
46
An amplitude ratio of 0.1 corresponds to __________ decibels.
-20
47
Pressure of 0.0001 absolute psi can be measured by __________ gauge.
Mcloid
48
thermometer can not measure sub-zero (< 0° C) temperature,
Bimetallic
49
Starting temperature of optical radiation pyrometer is __________ °C.
800
50
Liquid argon level in a pressurised storage tank (at 3 kg/cm2 ) is measured by a/an
Differential pressure gauge
51
Alphatron measures pressure __________ microns.
> 3
52
The deflection of the free end of the bimetallic strips in a bimetallic thermometer with temperature is nearly
linear
53
What is the ratio of output amplitude to input amplitude for a sinusoidal forcing function in a first order system ?
<1
54
The term analogous to the electrical current in a thermal system is the
heat flow rate
55
Reset rate
Integral time
56
What is the ratio of output amplitude to input amplitude for a sinusoidal forcing function in a first order system ?
less than 1
57
Which of the following is a 'contact' pyrometer
resistance pyrometer
58
Use of I-control along with P-control facilitates
elimination of offset
59
Liquid discharge from a tank or reservoir can not be measured by
orifice meters
60
are analysed using a polarograph
solids
61
On-off controllers are normally used for
low loads
62
Magnetic flowmeters are generally not used for the velocity/flow measurement of hydrocarbons due to their
low electrical conductivity
63
Which of the following controllers has maximum offset ?
P controller
64
Pressure of 0.01 psi (absolute) can be measured by __________ gauge.
Mcloid
65
Which of the following does not figure in the list of seven substances selected for international temperature scale ?
Zinc and Mercury
66
pH meter has
2
67
cannot be used to test the stability of a control system containing transportation lag.
Routh test
68
When a bare thermocouple is covered by a protective sheath, the response becomes
slower, non oscillatory
69
What is the normal percentage of rhodium in platinum + rhodium element used in the thermocouple ?
13
70
Helium gas constant volume thermometer is suitable for the measurement of a temperature of __________ °C.
<0
71
Which of the following thermocouples is the most suitable for measuring a temperature of about 1600°C in an oxidizing atmosphere ?
P-P-R
72
Mercury thermometer can be used to measure the temperature upto __________ °C.
350
73
Which of the following is not a differential pressure flow meter ?
Rotameter
74
A typical example of a physical system with under damped characteristic is a
spring loaded diaphragm valve.
75
aneroid barometer measures the __________ pressure.
absolute
76
The offset introduced by proportional controller with gain Kcin response of first order system can be reduced by
integral control
77
To increase the speed of response of a pressure spring liquid or gas expansion thermometer, the clearance space between the thermometer bulb and the thermal well should not be filled with
air
78
Emf generated in a thermocouple depends on the temperature
difference between hot and cold junctions
79
Radiation thermometer can not measure the temperature
liquid oxygen
80
Temperature measurement by optical pyrometer is done above __________ point, which is 1063°C.
gold
81
stability method uses open loop transfer function
Nyquist
82
A pyranometer is an instrument used for measuring the
global radiation
83
Composition of alloys can be determined by
polarograph

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