71. Dynamometers are :
A.Force measuring devices
B.Torque measuring devices
C.Power measuring devices
D.Energy measuring devices
72. In some measurements, in order to increase the sensitivity, two measuring and two reference cells are often used. This arrangement is usually referred to as :
A.Wheatstone bridge
B.Katharometer
C.Attenuator
D.Amplifier
73. Paramagnetic analyser is used to measure following gas sample in air
A.Oxygen
B.Ozone
C.Nitrogen
D.Nitrogen oxides
74. Continuous analysers for measuring following are based on the chemiluminescent nameless reaction with ethylene
A.Oxygen
B.Ozone
C.Sulphur oxides
D.Nitrogen oxides
75. Industrial flow meters are based on
A.Rotational devices
B.Flow through restrictions
C.Flow around obstructions
D.All of above
76. Chromatographic analyser is used to measure the
A.02 content in flue gases
B.CO2 content in flue gases
C.CO content in flue gases
D.(a) amount of individual gases in a mixture
77. The pH value is a measure of hydrogen ion in a solution. The letters pH stand for :
A.Percentage of H2 in solution
B.Power of the hydrogen ion concentration
C.Presence of hydrogen ions
D.Purity of H2O
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