Related Questions

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 instruments do not have
A High sensitivity
B Absence of frequency error
C Independence of ambient temperature
D High degree of measuring accuracy
The time constant of a thermocouple is
A The time taken to attain the final temperature to be measured
B The time taken to attain 50% of the value of initial temperature difference
C The time taken to attain 63.2% of the value of initial temperature difference
D Determined by the time taken to reach 100°C from 0°C
When a bare thermocouple is covered by a protective sheath, the response becomes
A Faster and oscillatory
B Faster and non-oscillatory
C Slower and oscillatory
D Slower and non-oscillatory
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
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
What is the normal percentage of rhodium in platinum + rhodium element used in the thermocouple?
A 0.1
B 3
C 13
D 29
Which of the following thermocouple materials does not contain nickel?
A Alumel
B Chromel
C Constantan
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

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