Q.1
Relationship between absorption/evolution of heat at the thermocouple junctions and the current flow in the circuit is given by __________ effect.
Q.2
Flapper nozzle is used in a/an __________ controller.
Q.3
Which of the following is not suitable for measuring the temperature of a red hot object in the range of 800 - 1600°C?
Q.4
Zirconia probe is used for the measurement of
Q.5
Specific gravity of a liquid can not be measured by a/an
Q.6
Continuous shell temperature measurement in a liquid-liquid heat exchanger is done by a
Q.7
Polarograph is meant for the analysis of
Q.8
0n-off control which is a special case of proportional control, has a band width of about __________ percent.
Q.9
Which is the strongest paramagnetic gas?
Q.10
A bimetallic thermometer as compared to industrial mercury in glass thermometer has almost the same
Q.11
Which of the following flow-metering instru-ments is an areameter?
Q.12
For two non-interacting first order systems connected in series, the overall transfer function is the __________ of the individual transfer functions.
Q.13
In a shell and tube heat exchanger, the flow rate of heating/cooling fluid is the __________ variable.
Q.14
Typical specifications for design stipulates the gain margin and phase margin to be respectively
Q.15
Which of the following judges the accuracy of an instrument?
Q.16
Out of the following themocouple wire insulating material, the highest temperature rating is for
Q.17
Which of the following thermocouple materials does not contain nickel?
Q.18
In a shell and tube heat exchanger, the inlet temperature of heating/cooling fluid is the __________ variable.
Q.19

Which of the following is an undesirable dynamic characteristic of an instrument ?

  • Reproducibility
  • Dead zone
  • Time lag
  • Static error
Q.20

Which of the following is not the triple point of water ?

  • 32°R
  • 273°K
  • 492°R
  • 32°F
Q.21

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 (a), (b) and (c).
Q.22

__________ is the static characteristics of an instrument,

  • Response
  • Tine lag
  • Drift
  • dynamic error
Q.23

Typical specifications for design stipulates the gain margin and phase margin to be respectively

  • > 1.7 and > 30°
  • < 1.7 and > 30°
  • < 1.7 and < 30°
  • > 1.7 and < 30°
Q.24

Thermal conductivity measurement com-prises the working principle of a

  • CO2 analyser
  • polarimeter
  • spectrometer
  • chromatograph
Q.25

The __________ of a vapor pressure thermometer is a secondary element.

  • pointer
  • Bourdon tube
  • bulb
  • none ofthese
Q.26

Load cells are used for the measurement of

  • stress
  • weight
  • strain
  • velocity
Q.27

Which of the following is the dynamic characteristics of an instrument ?

  • Reproducibility
  • Sensitivity
  • Dead zone
  • Fidelity
Q.28

Working principle of radiation pyrometer is based on the

  • Wien's law
  • Kirchoffs law
  • Stafan-Boltzman law
  • Seebeck effect
Q.29

Which of the following relates the emf. generated in a single homogeneous wire to the temperature difference ?

  • Peltier effect
  • Thomson effect
  • Seebeck effect
  • none of these
Q.30

Response of a system to a sinusoidal input is called __________ response.

  • impluse
  • unit step
  • frequency
  • none of these
Q.31

The closed loop pole of a stable second order system could be

  • both real and positive.
  • complex conjugate with positive real parts.
  • both real and negative.
  • one real positive and the other real negative.
Q.32

Starting temperature of optical radiation pyrometer is __________ °C.

  • 800
  • 400
  • 1200
  • 1500
Q.33

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.34

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

  • Seebeck effect
  • Peltier effect
  • Joule heating effect
  • Thomson effect
Q.35

Thermistors are used in __________ devices.

  • voltage measuring
  • temperature measuring
  • temperature compensating
  • both(b)&(c)
Q.36

Thermal wells used in temperature measurements should have

  • very thick walls.
  • low emissivity.
  • polished surface.
  • high transmissivity of radiation.
Q.37

Process degree of freedom indicates __________ number of controllers to be used.

  • the maximum
  • the minimum
  • both maximum and the minimum
  • nothing about the
Q.38

Gas analysis is commonly done using the

  • thermal conductivity cell
  • X-ray diffraction
  • mass spectrometer
  • emission spectrometer
Q.39

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.40

Smoke density of the flue gas going out of the chimney is measured by a

  • polarograph
  • thermal conductivity meter
  • photo electric cell
  • chromatograph
Q.41

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

  • gage glass
  • external float gage
  • differential pressure gage
  • none of these
Q.42

Which of the systems having following transfer functions is stable?

  • 1/(s2+ 2)
  • 1/(s2-2s + 3)
  • 1/(s2 + 2s + 2)
  • exp(-20s)/(s2 + 2s-l)
Q.43

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

  • load
  • controlled
  • manipulated
  • none of these
Q.44

Which of the following flow-metering instru-ments is an areameter ?

  • Venturimeter
  • Rotameter
  • Pitot tube
  • Hot wire anemometer
Q.45

Characteristic equation is the denominator of __________ loop transfer function.

  • open
  • closed
  • both (a)and (b)
  • neither (a) nor (b)
Q.46

Operating range of a temperature measuring instrument isto 1600°C. It could be a/an __________ pyrometer.

  • radiation
  • optical
  • photoelectric
  • none of these
Q.47

Thermal conductivity measurement is used for the determination of

  • O2 percentage in the flue gas.
  • specific gravity of petrofuels.
  • composition of an alloy.
  • CO2 percentage in the flue gas.
Q.48

In a single tank system, the transfer function of level to inlet flow rate is

  • R/TS
  • R/(TS + 1)
  • l(TS + l)
  • 1/TS
Q.49

What is the dynamic error in a critically damped second order instrument for a ramp input (At) ?

  • 0.5 AT
  • 2 AT
  • AT
  • 1.5 AT
Q.50

Phase lag of the frequency response of a second order system to a sinusoidal forcing function

  • is 30°
  • is 90° at the most
  • approaches 180° asymptotically
  • is 120°
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