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Mechanical Engineering Objective Questions { Instrumentation and Control }



78. The density can be measured using
A.Weight
B.All of above.
C.Hydrostatic head
D.Resonant elements

79. Electrode potential is concerned with measurement of :
A.Density
B.Viscosity
C.Chemical analysis
D.PH

80. Almost all pH measurements are best made with a:
A.Glass electrode
B.Solid state electrode
C.Liquid ion exchange electrode
D.Redox electrode

81. Pure water has pH value of 7. This means that pure water has :
A.7 of ionized hydrogen per litre
B.10 g of ionized hydrogen in/rn3
C.10-7 % of ionized hydrogen
D.10-7 g of ionized hydrogen per litre

82. Which measurement is a good guide to the quality of the water :
A.Conductivity
B.PH
C.Dissolved O2 content
D.Turbidity

83. Spectrophotometer is used to :
A.Measure surface hardness
B.Measure surface characteristics
C.Measure chemical composition of alloys
D.Analyse colour spectrum

84. The change in length of humidity sensitive elements is measured by :
A.Hydrometer
B.Hygrometer
C.Psychrometer
D.Photometer

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