Related Questions

Out of the following, the highest emf for a given temperature is generated by the __________ thermocouple.
A Chromel - alumel
B Iron - constantan
C Platinum - platinum + rhodium
D Copper-constantan
Temperature of hot gases flowing in a pipe is measured by a thermocouple inserted in the thermal well. The thermal well made of __________ will facilitate the most accurate measurement of the temperature.
A Copper
B Steel
C Aluminium
D Brass
Which of the following relates the emf. generated in a single homogeneous wire to the temperature difference?
A Peltier effect
B Thomson effect
C Seebeck effect
D None of these
The maximum service temperature for fibre glass used as thermocouple wire insulation material is __________ °C.
A 250
B 500
C 750
D 1000
The emf generated in a dc generator is directly proportional to
A Flux per pole
B No, of oples
C Spped of armature
D all above
An emf of the order of mV is generated when two solutions of different hydrogen ion concentration are separated by a thin glass wall. This is the working principle of a
A PH meter
B Polarimeter
C Chromatograph
D Polarograph
Nickel percentage in invar which is an iron-nickel alloy, and is used as a thermocouple material is
A 12
B 36
C 54
D 68
The output of a thermocouple is:
A a capacitance
B a resistance
C a current
D a voltage
E None of the above
The thermocouple instrument will measure
A Current
B Voltage
C Flux
D None of the above
The thermocouple instruments do not have
A High sensitivity
B Absence of frequency error
C Independence of ambient temperature
D High degree of measuring accuracy

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