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Quiz 4
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Q.1
Load cells are used for the measurement of
Stress
Weight
Strain
Velocity
Q.2
Thermistors are used in __________ devices.
Voltage measuring
Temperature measuring
Temperature compensating
Both B & C
Q.3
__________ stability method uses open loop transfer function.
Nyquist
Mikhalov
Ruth
None of these
Q.4
Vapour actuated pressure spring thermometer does not require ambient temperature compensation. Ambient temperature compensation is provided in gas or liquid expansion pressure spring thermometer by
Making the volume of thermometer bulb as large as conveniently possible
Reducing the volume of the capillary to a minimum
Reducing the volume of the receiving element to a minimum
All of the above
Q.5
Psychrometer determines the
Humidity of gases
Moisture content of solids
Water of crystallisation
Hygroscopic nature of solids
Q.6
A constant volume gas thermometer employing __________ is used to measure sub-zero (i.e., < 0° C) temperature.
Helium
Hydrogen
Nitrogen
None of these
Q.7
Which of the following thermocouples is incapable of measuring sub-zero (i.e., < 0°C) temperature?
Chromel-alumel
Iron-constantan
Platinum-platinum + rhodium
Copper-constantan
Q.8
A first order system with a time constant of 1 min is subjected to frequency response analysis. At an input frequency of 1 radian/min, the phase shift is
45°
-90°
-180°
-45°
Q.9
Photoelectric pyrometers are suitable in the temperature range of __________ °C.
400-1600
800-1600
800-2500
400-1000
Q.10
A mercury thermometer can not be used to measure the temperature below the freezing point of mercury, which is __________ °C.
-38.9
-11.9
-60.9
-80.9
Q.11
Number of poles in a system with transfer function 1/(s² + 2s² + 1) is
2
5
3
1
Q.12
The amplitude ratio for the sinusoidal response of __________ is < 1.
Transportation lag
First order system
Second order system
None of these
Q.13
The amplitude ratio for the sinusoidal response of a __________ is 1.
First order system
Second order system
Transportation lag
None of these
Q.14
Phase margin is equal to
180° - phase lag
Phase lag - 180°
Phase lag + 180°
Phase lag + 90°
Q.15
Which of the following is not a second order instrument?
Mercury in glass thermometer with covering
Bare mercury in glass thermometer
Pressure gauge with one bellow, two tubes and a tank
None of these
Q.16
Temperature of __________ can not be measured by an optical or radiation pyrometer.
Hot blast (air) from stoves
Molten slag flowing out of blast furnace
Combustion space in boilers
Rotary limestone calcination kiln
Q.17
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
Depends only upon the open loop transfer function
Determines its stability
Is the same for set point or load changes
All of the above
Q.18
Dilute wine was used as a thermometric liquid initially to develop temperature scale. First emperical temperature scale developed was the __________ scale.
Kelvin
Centigrade
Fahrenheit
Reaumer
Q.19
Mass spectrometer is used for the composition analysis of
Alloys
Solids
Isotopes
None of these
Q.20
Stability of a control system containing a transportation lag can be best analysed by
Routh test
Root locus methods
Frequency response methods
None of these
Q.21
Starting temperature of optical radiation pyrometer is __________ °C.
800
400
1200
1500
Q.22
Bourdon gauges are used for measuring pressure (kg/cm² )
< atmospheric
> 2 (gauge)
< 2 (gauge)
> 10 (absolute)
Q.23
Which of the following is an undesirable dynamic characteristic of an instrument?
Reproducibility
Dead zone
Time lag
Static error
Q.24
Pick out the wrong statement
Proportional controller is normally used for level control in industrial applications
CSTR can be considered as a distributed parameter system
Distributed parameter approach gives partial differential equation
Non-linear behaviour is exemplified by an on-off controller
Q.25
Pick out the wrong statement.
O₂, NO and NO₂ exhibit paramagnetic properties as a result of unpaired electrons
CO₂ is the strongest paramagnetic gas
Paramagnetic susceptibility of gases decreases with temperature
Paramagnetic susceptibility of gases permits the measurement of their concentration
Q.26
Pick out the wrong statement.
There is no transfer lag for a single first order system
Stirred tank with a water jacket exemplifies an interacting system
Transfer lag is a characteristics of all higher order systems (other than first order systems)
Transfer lag decreases as the number of stages decreases
Q.27
Which of the following is not the triple point of water?
32°R
273°K
492°R
32°F
Q.28
The frequency response of a first order system, has a phase shift with lower and upper bounds given by
- ∞, π/2
-π/2, π/2
-π/2, 0
0, π/2
Q.29
Thermisters which have a very high temperature co-efficient of resistivity belong to the class of solid called
Dielectrics
Insulators
Semi conductors
Conductors
Q.30
Gain margin is equal to the
Amplitude ratio
Reciprocal of amplitude ratio
Gain in P controller
Gain in P-I controller
Q.31
Working principle of mercury in glass thermometer is based on volumetric expansion of mercury with increase in temperature. Which of the following undergoes minimum volumetric expansion for a given temperature change?
Water
Mercury
Methyl alcohal
Carbon-tetrachloride
Q.32
The offset introduced by proportional controller with gain K
c
in response of first order system can be reduced by
Reducing value of K
c
Introducing integral control
Introducing derivative control
None of the above
Q.33
In a second order under damped system, the
Time required for the response of first reach its ultimate value is called the response time
Overshoot (which is a measure of how much the response exceeds the ultimate value) increase with the decrease of damping co-efficient e
Decay ratio (which is the ratio of the sizes of successive peaks) is equal to the reciprocal of overshoot
None of these
Q.34
A system with a double pole at the origin is unstable since the corresponding term in the time domain
Is a constant
Grows exponentially with time
Grows linearly with time
Decays linearly with time
Q.35
Use of I-control along with P-control facilitates
Elimination of offset
Reduction of offset
Reduction of stability time
None of these
Q.36
Emf generated in a thermocouple depends on the temperature
Of cold junction only
Of hot junction only
Difference between hot and cold junctions
Difference between cold junction and atmospheric temperature
Q.37
Stabilising time for the controllers is the time required for the response to reach __________ percent of its ultimate value.
63.2
87.5
95
100
Q.38
pH meter has
One cell
Two cells
Three cells
No cell
Q.39
A sinusoidal variation in the input passing through a linear first order system
Becomes more oscillatory (frequency increases)
Becomes less oscillatory (frequency decreases)
Gets amplified (magnitude increases)
Gets attenuated (magnitude decreases)
Q.40
Continuous measurement of specific gravity of a liquid is done by
Hydrometer
Contact-type electric indicators
Displacement meter
Both A and C
Q.41
Which of the following temperature measuring instruments need not touch the object whose temperature is being measured?
Radiation/infrared pyrometer
Filled system thermometer
Mercury in glass thermometer
Thermo electric pyrometer
Q.42
Emf developed by a thermocouple while measuring a temperature of 400°C is 22 mV. The type of thermocouple used is
Chromel-alumel
Iron-constantan
Platinum-rhodium
Platinum-platinum+rhyodium
Q.43
The level of a liquid under pressure can be determined using
Bubbler system
Differential pressure manometer
Diaphragm box system
Air-trap system
Q.44
The __________ of a vapor pressure thermometer is a functioning element.
Pointer
Bourdon tube
Bulb
None of these
Q.45
Working principle of mercury in glass thermometer is
Volumetric expansion
Pressure rise with temperature
Linear expansion
None of these
Q.46
Which of the following is not a differential pressure flow meter?
Rotameter
Flow nozzle
Orificemeter
Venturimeter
Q.47
Which of the following is not a composition measuring instrument?
Thermal conductivity cell
Mass spectrometer
Polarograph
Hot wire anemometer
Q.48
Positioning controllers are used for
Low loads
Temperature changes
High loads
Flow rate changes
Q.49
Pick out the one which is a first order instrument.
Mercury in glass thermometer (without any covering or air gap)
Bare metallic thermometer
Bare vapor pressure thermometer
All of the above
Q.50
Emf developed by a thermocouple while measuring a temperature of 800°C is about 31 mV. The type of thermocouple used is
Chromel-alumel
Iron-constantan
Platinum-platinum+rhodium
None of these
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