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Day 2 > Instrumentation > Flashcards

Instrumentation Flashcards

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
Q

Thermocouple in a thermal well behaves as a true

A

Multiple first order system

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26
Q

The transfer function for a P-D controller is

A

Kc(1+τDs)

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27
Q

Bode diagram is a plot of

A

log (AR)vs. log (f) and (Φ) vs. log (f)q

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28
Q

Working principle of disappearing filament type optical pyrometer is based on the

A

Wien’s law

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29
Q

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.

A

increase

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30
Q

True or False. CSTR can be considered as a distributed parameter system.

A

False

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31
Q

The time constant of a first order process with resistance R and capacitance C is

A

RC

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32
Q

sinusoidal variation in the input passing through a linear first order system

A

gets attentuated (magnitude decreases)

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33
Q

Nitrogen gas constant volume thermometer is suitable for measuring a temperature of __________ °C.

A

> 100

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34
Q

Pick out the most suitable instrument for measuring temperature in the range of-40 to 425°C.

A

Bimetallic thermometer

35
Q

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

A

Peltier

36
Q

Configuration of Bourdon spring tube is never made of __________ shape

A

circular

37
Q

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

A

180 C

38
Q

Measurement of pressure in ammonia reactor is done by

A

Bourdon tube

39
Q

The fluid used in hydraulic controller is

A

oil

40
Q

“A control system is unstable, if the open loop frequency response exhibits an amplitude ratio exceeding unity at the crossover frequency.” This is __________ criterion.

A

Bode stability

41
Q

Feed forward controller accounts for the __________ changes.

A

load

42
Q

Which thermocouple can be used to measure a temperature of around 1400°C

A

Platinum Platinum/Rhodium

43
Q

Which of the following filled system expansion thermometer has the capability to measure the lowest temperature ?

A

Alcohol in glass thermometer

44
Q

Which of the following can not measure a temperature of 1600°C ?

A

Platinum resistance thermometer

45
Q

The temperature range for which copper resistance thermometer can be used is __________ °C

A

-200 to 150

46
Q

An amplitude ratio of 0.1 corresponds to __________ decibels.

A

-20

47
Q

Pressure of 0.0001 absolute psi can be measured by __________ gauge.

A

Mcloid

48
Q

thermometer can not measure sub-zero (< 0° C) temperature,

A

Bimetallic

49
Q

Starting temperature of optical radiation pyrometer is __________ °C.

A

800

50
Q

Liquid argon level in a pressurised storage tank (at 3 kg/cm2) is measured by a/an

A

Differential pressure gauge

51
Q

Alphatron measures pressure __________ microns.

A

> 3

52
Q

The deflection of the free end of the bimetallic strips in a bimetallic thermometer with temperature is nearly

A

linear

53
Q

What is the ratio of output amplitude to input amplitude for a sinusoidal forcing function in a first order system ?

A

<1

54
Q

The term analogous to the electrical current in a thermal system is the

A

heat flow rate

55
Q

Reset rate

A

Integral time

56
Q

What is the ratio of output amplitude to input amplitude for a sinusoidal forcing function in a first order system ?

A

less than 1

57
Q

Which of the following is a ‘contact’ pyrometer

A

resistance pyrometer

58
Q

Use ofI-control along withP-control facilitates

A

elimination of offset

59
Q

Liquid discharge from a tank or reservoir can not be measured by

A

orifice meters

60
Q

are analysed using a polarograph

A

solids

61
Q

On-off controllers are normally used for

A

low loads

62
Q

Magnetic flowmeters are generally not used for the velocity/flow measurement of hydrocarbons due to their

A

low electrical conductivity

63
Q

Which of the following controllers has maximum offset ?

A

P controller

64
Q

Pressure of 0.01 psi (absolute) can be measured by __________ gauge.

A

Mcloid

65
Q

Which of the following does not figure in the list of seven substances selected for international temperature scale ?

A

Zinc and Mercury

66
Q

pH meter has

A

2

67
Q

cannot be used to test the stability of a control system containing transportation lag.

A

Routh test

68
Q

When a bare thermocouple is covered by a protective sheath, the response becomes

A

slower, non oscillatory

69
Q

What is the normal percentage of rhodium in platinum + rhodium element used in the thermocouple ?

A

13

70
Q

Helium gas constant volume thermometer is suitable for the measurement of a temperature of __________ °C.

A

<0

71
Q

Which of the following thermocouples is the most suitable for measuring a temperature of about 1600°C in an oxidizing atmosphere ?

A

P-P-R

72
Q

Mercury thermometer can be used to measure the temperature upto __________ °C.

A

350

73
Q

Which of the following is not a differential pressure flow meter ?

A

Rotameter

74
Q

A typical example of a physical system with under damped characteristic is a

A

spring loaded diaphragm valve.

75
Q

aneroid barometer measures the __________ pressure.

A

absolute

76
Q

The offset introduced by proportional controller with gainKcin response of first order system can be reduced by

A

integral control

77
Q

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

A

air

78
Q

Emf generated in a thermocouple depends on the temperature

A

difference between hot and cold junctions

79
Q

Radiation thermometer can not measure the temperature

A

liquid oxygen

80
Q

Temperature measurement by optical pyrometer is done above __________ point, which is 1063°C.

A

gold

81
Q

stability method uses open loop transfer function

A

Nyquist

82
Q

A pyranometer is an instrument used for measuring the

A

global radiation

83
Q

Composition of alloys can be determined by

A

polarograph

Day 2 (6 decks)

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