At room temperature [H+] [OH-] is equal to ________________?
A.10-7 moles/litre
B.10-14 moles/litre
C.10-10 moles/litre
D.10-16 moles/litre
Category: Instrumentation and Process Control Mcqs
Thermistor is made of __________________?
A. Oxides or salts of metals
B. Metal
C. Two different metals
D. Two similar metal wires.
Conductivity of platinum __________________?
A. Remains constant with change in temperature
B. Increases with increase in temperature
C. Decreases with increase in temperature
D. Increases linearly with increase in temperature
Bolometer works on the principle of__________________?
A.change of electrical resistance with change in temperature
B.volumetric expansion of mercury with increase in temperature
C.increase of vapour pressure with increase in temperature
D.linear expansion with increase in temperature
Thermopile is used for the measurement of ___________________?
A.current
B.e.m.f.
C.temperature
D.flow rate
For a given thermocouple E.M.F. generated __________________?
A.depends on the tempaterature of hot junction
B.depends on the temperature of cold junction
C.depends on the temperature difference between hot and cold junctions
D.is constant for all temperature differences between hot and cold junctions
The units of specific conductance are_____________________?
A.ohm/cm
B.mho/cm
C.ohm-cm
D.mho-cm
If [OH-] = 10-6 moles/litre its pH is___________________?
A.6
B.8
C.12
D.3
Conductivity meter works on the principle of ______________________?
A.change of angle of refraction with composition
B.polarisation of light
C.change of electrical conductivity of solution with composition
D.change of electrical resistance with temperature.
Which one of the following properties of thermocouples for industrial use is undersirable?
A.Relative large thermal e.m.f.
B.Resistance to corrosion and oxidation
C.Non-linear relation of e.m.f. to temperature
D.Precision of calibration
