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Quiz 6
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Q.1
__________ type of element is normally not used in the bimetallic thermometers.
Flat spiral
Bourdon tube
Single helix
Multiple helix
Q.2
Which of the following thermocouples will give the highest output for the same value of hot and cold junction temperature?
Platinum-platinum + rhodium
Iron-constantan
Chromel-constantan
All of the above
Q.3
Nichol's chart deals with
A.R. vs. phase lag of first order
A.R. vs. phase lag of second order
Closed loop values vs. open loop values
Frequency response values of controllers
Q.4
Dilatometer is used to measure
Stress
Strain
Deflection
Contraction/expansion due to changes in temperature
Q.5
In an exothermic chemical reactor, the manipulated variable is the flow rate of
Coolant
Reactants
Product
None of these
Q.6
Which of the following shows maximum dip effect (indicating reverse direction of temperature change)?
Mercury thermometer
Radiation pyrometer
Bimetallic thermometer
Thermocouple
Q.7
Minute depression of freezing point of a liquid solvent on addition of a solid solute can be best measured by a
Beckman thermometer
Dilatometer
Mercury thermometer
Bimetallic thermometer
Q.8
Specific conductance is defined as the reciprocal of resistance in ohms of 1c.c. of liquid at a specified temperature. Its value for distilled water is about __________ micro mho/cm³.
50
100
10
1
Q.9
Which of the following thermocouples is the most suitable for measuring a temperature of about 1600°C in an oxidizing atmosphere?
Platinum-platinum + rhodium
Iron-constantan
Copper-constantan
Chromel-alumel
Q.10
Thermal wells used in temperature measurements should have
Very thick walls
Low emissivity
Polished surface
High transmissivity of radiation
Q.11
Process degree of freedom indicates __________ number of controllers to be used.
The maximum
The minimum
Both maximum and the minimum
Nothing about the
Q.12
Which of the following can measure temperatures in the range of - 20 to 300°C ?
Mercury in glass thermometer
Vapor pressure thermometer
Resistance thermometer
None of these
Q.13
Paramagnetism method is not used for the composition determination of __________ in gases.
Oxygen
Oxides of nitrogen
Carbon dioxide
Any of these
Q.14
Phase lag of the sinusoidal response of a first order system is
120°
30°
180°
90°
Q.15
The unit step response of the transfer function 1/(s² + 2s + 3)
Has a non-zero slope at the origin
Has a damped oscillatory characteristics
Is overdamped
Is unstable
Q.16
Thermal conductivity based continuous flue gas analyser makes use of varying thermal conductivity of the constituents of flue gases. Which of the following constituents of flue gases has the maximum thermal conductivity?
CO₂
N₂
O₂
CO
Q.17
In Bode plot, A.R. vs. w is plotted on a/an __________ graph paper.
Log-lag
Triangular
Ordinary
Semi-log
Q.18
Small furnace draught is accurately measured by an inclined tube manometer, in which the manometric liquid used most commonly is
Water
Carbon tetrachloride
Paraffin
Ethylene glycol
Q.19
Bimetal strips are not used in
Bimetallic thermometers
Thermocouples
Thermostats
Relays for opening & closing of electrical circuits
Q.20
A first order system with unity gain and time constant τ is subjected to a sinusoidal input of frequency w = 1/τ. The amplitude ratio for this system is
1
0.5
1/√2
0.25
Q.21
The Laplace transform of exp(at), where a > 0, is defined only for the Laplace parameter, s > a since
The function is exponential
The Laplace transform of integral of exp(at) has finite values only for s > a
The Laplace transform integral of exp(at) has initial values only for s > a
The function exp(at) is piece-wise continuous only for s > a
Q.22
Hot wire anemometer is used for the measurement of
Flow rates of fluids
Flow rates of granular solids
Very high temperature
Thermal conductivity of gases
Q.23
Stroboscope is used for the measurement of
Rpm of a flywheel
Frequency of light
Depression of freezing point
Liquid level under pressure
Q.24
The transfer function for a P-D controller is
Kc(1+τD s)
Kc(1 +1/τD s)
Kc τD s
Kc/τD s
Q.25
The thermal emf-temperature relationship of most thermocouples is
Linear
Parabolic
Exponential
Square root
Q.26
In Bode plot, Φ vs ω is plotted on a/an __________ graph paper.
Log-log
Ordinary
Semi-log
Triangular
Q.27
Compositional analysis of flue gas coming out of a furnace in respect of O₂ and CO₂% can be continuously done by a/an
Orsat apparatus
Thermal conductivity cell
Zirconia probe
Chromatograph
Q.28
The maximum service temperature for fibre glass used as thermocouple wire insulation material is __________ °C.
250
500
750
1000
Q.29
The transfer function of a first order system is
1/(Ts + 1)
1/Ts
S/(Ts + 1)
None of these
Q.30
The pressure sensing element of elastic type pressure gauge is never made in the form of a
Bellow
Diaphragm
Strip
Bourdon tube
Q.31
Gas chromatography is used for the measurement of
Temperature
Pressure
Concentration
Flow rate
Q.32
The frequency at which maximum amplitude ratio is attained is called the __________ frequency.
Corner
Resonant
Cross-over
Natural
Q.33
Continuous flue gas analyser makes use of paramagnetic properties of some of its constituents, which move towards the strongest part of the magnetic field thus displacing diamagnetic gases. Which of the following gases is diamagnetic?
CO₂
O₂
NO
NO₂
Q.34
The time constant of a first order process with resistance R and capacitance C is
R + C
R - C
RC
1/RC
Q.35
Which of the following thermometers is not suitable for distant reading upto 60 metres?
Vapor pressure thermometer
Mercury in glass thermometer
Constant volume gas thermometer
Resistance thermometer
Q.36
Presence of a small amount of water in the organic systems can be determined by the __________ method.
Electrical conductivity
Polarimetry
Emission spectroscopy
Dielectric constant end loss factor
Q.37
Which of the following is a 'contact' pyrometer?
Resistance pyrometer
Optical pyrometer
Radiation pyrometer
Infra red pyrometer
Q.38
The operation of a rotameter is based on
Variable flow area
Rotation of a turbine
Pressure drop across a nozzle
Pressure at a stagnation point
Q.39
Response of a system to a sinusoidal input is called __________ response.
Impluse
Unit step
Frequency
None of these
Q.40
Mercury manometer (U-tube type) exemplifies a __________ order system.
Zero
First
Second
Third
Q.41
The term analogous to voltage in a single tank system is the
Heat content of the system
Liquid volume in the tank
Flow rate
Level of liquid
Q.42
Pirani gauge is used for the measurement of
Very high pressure
High vacuum
Liquid level under pressure
Liquid level at atmospheric pressure
Q.43
Stalagmometer is used for the measurement of
Kinematic viscosity
Surface tension
Refractive index
Optical activity
Q.44
Working principle of disappearing filament type optical pyrometer is based on the
Wien's law
Seebeck effect
Kirchoff's law
Peltier effect
Q.45
Emf developed by a thermocouple, while measuring a temperature of 600°C is about 5.5 mV. The type of thermocouple used is
Chromel-alumel
Iron-constantan
Platinum-platinum+rhodium
Either A, B or C
Q.46
If response of a control system is to be free of offset and oscillation, the most suitable controller is
Proportional controller
Proportional-derivative(PD)controller
Proportional-integral (PI) controller
Proportional integral-derivative (PID) controller
Q.47
Sub-zero temperature (< 0°C) can be measured by a constant volume gas thermometer employing
Helium
Nitrogen
Hydrogen
None of these
Q.48
The transfer function of a pure dead time system with dead time τ
d
is
1/(τ
d
s + 1)
Τ
d
s + 1
E
-τ
d
s
E
τ
d
s
Q.49
In a shell and tube heat exchanger, the outlet temperature of heating/cooling fluid is the __________ variable.
Load
Manipulated
Controlled
None of these
Q.50
Which is the most suitable instrument for measuring pressure below 3 microns?
Mcleoid gauge
Alphatron
Ionisation gauge
Bourdon guage
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