Test
ROB_6 Sensor technologies
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Preguntas del test (50)
1Which of the following is an undesirable dynamic characteristic of an instrument ?
- AReproducibility
- BDead zone
- CTime lag
- DStatic error
2Which of the following is not the triple point of water ?
- A32°R
- B273°K
- C492°R
- D32°F
3Pick out the one which is a first order instrument.
- AMercury in glass thermometer (without any covering or air gap).
- BBare metallic thermometer.
- CBare vapor pressure thermometer.
- DAll (a), (b) and (c).
4Load cells are used for the measurement of
- AA. stress
- BB. weight
- CC. strain
- DD. velocity
5Which of the following is the dynamic characteristics of an instrument ?
- AReproducibility
- BSensitivity
- CDead zone
- DFidelity
6Pick out the wrong statement.
- AO2, NO and NO2 exhibit paramagnetic properties as a result of unpaired electrons.
- BCO2 is the strongest paramagnetic gas.
- CParamagnetic susceptibility of gases decreases with temperature.
- DParamagnetic susceptibility of gases permits the measurement of their concentration.
7The __________ of a vapor pressure thermometer is a functioning element.
- Apointer
- Bbourdon tube
- Cbulb
- Dnone of these
8A negative gain margin expressed in decibels means a/an __________ system.
- Astable
- Bunstable
- Ccritically damped
- Dnone of these
9Thermistor, which has high temperature co-efficient of resistivity, is used as the sensing element in resistance thermometer. It is a/an
- Ainsulator
- Bconductor
- Csolid semi-conductor
- Dliquid semi-conductor
10Flapper nozzle is used in a/an __________ controller.
- Aelectronic
- Bhydraulic
- Cpneumatic
- Dnone of these
11Typical specifications for design stipulates the gain margin and phase margin to be respectively
- A> 1.7 and > 30°
- B< 1.7 and > 30°
- C< 1.7 and < 30°
- D> 1.7 and < 30°
12Working principle of radiation pyrometer is based on the
- AWien's law
- BKirchoffs law
- CStafan-Boltzman law
- DSeebeck effect
13Which of the following relates the emf. generated in a single homogeneous wire to the temperature difference ?
- APeltier effect
- BThomson effect
- CSeebeck effect
- Dnone of these
14Temperature measuring instruments are standardised mostly with __________ points of pure substances.
- Amelting
- Bboiling
- Cboth (a) & (b)
- Dneither (a) nor (b)
15Dilute wine was used as a thermometric liquid initially to develop temperature scale. First emperical temperature scale developed was the
__________ scale.- AKelvin
- BCentigrade
- CFarenhite
- DReaumer
16 In a single tank system, the transfer function of level to inlet flow rate is
- AR/TS
- BR/(TS + 1)
- Cl(TS + l)
- D1/TS
17 Pick out the first order system from among the following.
- ADamped vibrator.
- BMercury in glass thermometer kept in boiling water
- CInteracting system of two tanks in series.
- DNon-interacting system of two tanks in series
18The maximum service temperature for fibre glass used as thermocouple wire insulation material is __________ °C.
- A250
- B500
- C750
- D1000
19Which of the following is a desirable characteristic of an instrument ?
- AHigh drift
- BHigh fidelity
- CHigh measuring lag
- DPoor reproducibility
20Which of the following controllers has the least maximum deviation ?
- AP-controller
- BP-I controller
- CP-I-D controller
- DP-D controller
21The operation of a rotameter is based on
- Avariable flow area.
- Brotation of a turbine.
- Cpressure drop across a nozzle.
- Dpressure at a stagnation point.
22The temperature of tempering oil baths maintained at 400°C during heat treatment of steel is measured by a/an __________ thermocouple.
- Achromel-alumel
- Biron-constantan
- Cplatinum-platinum/rhodium
- Dnone of these.
23Volumetric expansion is the working principle of the __________ thermometers.
- Amercury in glass
- Bconstant volume gas
- Cvapor pressure
- Dbimetallic
24Which of the following measurements can be made by the measurement of emf ?
- ApH value
- BDegree of hydrolysis
- CComposition of complex ions
- DAll (a), (b) & ©
25A magnetic flowmeter is
- Abased on the principle of Faraday's law.
- Bcapable of measuring the flow rate of slurries and electrolytes.
- Cbased on the linear relationship between the fluid flow rate and the induced voltage.
- Dall (a), (b) and (c).
26Zirconia probe is used for the continuous measurment of __________ flue gases going out of the furnace.
- Aoxygen in
- Bcarbon dioxide in
- Ccarbon monoxide in
- Dtemperature of
27Strain gage pressure transducers are used to measure __________ pressures.
- Agage as well as vacuum
- Babsolute as well as differential
- Cboth (a) and (b)
- Dneither (a) nor (b)
28The transfer function for a PID controller is (where, τ i is the integral (reset) time and τD is the derivative time.)
- AA
- BB
- CC
- DD
29Compositional analysis of __________ is done using mass spectrometer.
- Aan isotope
- Bnatural gas
- Ca solid
- Dan alloy
30The function of a transducer is to
- Amodify the input signal.
- Bamplify the input signal.
- Cconvert the primary signal into a more useful quantity, usually an electric impulse.
- Dcodify/decodify the input signal.
31Nichol's chart deals with
- AA.R. vs. phase lag of first order.
- BA.R. vs. phase lag of second order.
- Cclosed loop values vs. open loop values.
- Dfrequency response values of controllers.
32 Which of the following thermocouples will give the highest output for the same value of hot and cold junction temperature ?
- APlatinum-platinum + rhodium.
- BIron-constantan.
- CChromel-constantan.
- DAll will give the same output.
33A proportional controller with a gain of Kc is used to control a first order process. The offset will increase, if
- AKc is reduced
- BKc is increased.
- Cintegral control action is introduced.
- Dderivative control action is introduced.
34The symbol for "capillary line" in instrumentation diagram is
- AA
- BB
- CC
- DD
35__________ is undesirable in thermocouples used in industries,
- ALinear relation of emf to temperature
- BCorrosion resistance
- COxidation resistance
- DNon-linear relation of emf to temperature
36 Select the correct statement from the following.
- AThe frequency response of a pure capacity process is unbounded.
- BThe phase lag of a pure time delay system decreases with increasing frequency.
- CThe amplitude ratio of a pure capacity process is inversely proportional to frequency.
- DThe amplitude ratio of a pure time delay system increases with frequency.
37For an input forcing function, X(t) = 2t^2, the Laplace transform of this function is
- A2/s^2
- B4/s^2
- C2/s^3
- D4/s^3
38Instrumentation in a plant offers the advantage of
- Agreater safety of operation
- Bbetter quality of product
- Cgreater operation economy
- Dall (a), (b) and (c)
39Continuous shell temperature measurement in a liquid-liquid heat exchanger is done by a
- Athermocouple
- Breistance thermometer
- Cmercury in glass thermometer
- Dvapor pressure thermometer
40The __________ of a vapor pressure thermometer is a secondary element.
- Apointer
- BBourdon tube
- Cbulb
- Dnone ofthese
41Which of the following temperature measuring instruments need not touch the object whose temperature is being measured ?
- ARadiation/infrared pyrometer
- BFilled system thermometer
- CMercury in glass thermometer
- DThermo electric pyrometer
42Emf developed by a thermocouple, while measuring a temperature of 600°C is about 5.5 mV. The type of thermocouple used is
- Achromel-alumel
- Biron-constantan
- Cplatinum-platinum+rhodium
- Deither (a), (b) or ©
43Thermal conductivity measurement com-prises the working principle of a
- ACO2 analyser
- Bpolarimeter
- Cspectrometer
- Dchromatograph
44Which of the following relates the absorption & evolution of heat at the junctions of a thermocouple to the current flow in the circuit?
- ASeebeck effect
- BPeltier effect
- CJoule heating effect
- DThomson effect
45The second order system with the transfer function has a damping ratio of
- A2.0
- B0.5
- C1.0
- D4.0
46Response of a system to a sinusoidal input is called __________ response.
- Aimpluse
- Bunit step
- Cfrequency
- Dnone of these
47In a shell and tube heat exchanger, the flow rate of heating/cooling fluid is the __________ variable.
- Aload
- Bcontrolled
- Cmanipulated
- Dnone of these
48The closed loop pole of a stable second order system could be
- Aboth real and positive.
- Bcomplex conjugate with positive real parts.
- Cboth real and negative.
- Done real positive and the other real negative.
49Smoke density of the flue gas going out of the chimney is measured by a
- Apolarograph
- Bthermal conductivity meter
- Cphoto electric cell
- Dchromatograph
50Transfer function of transportation lag is
- AeTS
- Be-TS
- C
- Dnone of these
Información
- Descripción
- Test sobre ROB_6 Sensor technologies, creado por Robotics Robotics el 19/12/2018.
- Autor
- Robotics Robotics
- Idioma
- English
- Visitas
- 57
- Valoración
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