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WorksheetsMI MCQ SET3
Total questions: 21
Worksheet time: 11mins
Temperature Coefficient of RTD =
α= ( R100 - R0)/100 X R0
α= ( R100 - R0)/100 X R0
( R100 - R100)/100 X R1
α0= ( R0 - R0)/100 X R0
R100 = RTD resistance at _____________°C
0°C
10°C
100°C
1000°C
RTD has____ temperature co-efficient of resistance.
Negative
Positive
Non linear
linear
RTD is constructed using
Copper
Platinum
Aluminium
Brass
To prevent short circuit between wire and metal sheath in RTD
Inconel sheet used
Aluminium powder used
Rubber insulator used
porcelain insulator
used
In industrial application RTD rarely used above
660 °C.
6600 °C.
1000 °C.
100 °C.
Thermistor made from a specific mixture of pure oxides & metals
660 °C.
982ºc
100°C
0°C
NTC Thermistor has resistance values between 0.1 Ω and 100Ω AT
35ºC
33ºC
25ºC
20ºC
PTC thermistors are designed to operate is the range
20ºC to 200ºC
2ºC to 200ºC
100ºC to 200ºC
10ºC to 200ºC
The material used for PTC Thermistor is
chromium
barium tiltanate.
manganese
iron
PTC stands for
post temperature component
positive temperature
coefficient
positive transistor
conductor
post transistor
coefficient
Thermocouple converts temparature into
volatage
resistence
current
temprature
Working principle of a thermocouple depends on the
Mechanical displacement
Electric effect
Thermal effect
thermo-electric effect
The amount of the current produced depends on the difference in
temperature between the two junctions
Static electric effect
see beck effect
petlier effect
Pizo electric effect
Thermocouple has
2 junctions
3 junctions
4 junctions
no junction
J type thermocouple is combination of
Copper Constantan
Iron Constantan
Chromel Alumel
Cobalt
K type thermocouple is combination of
Copper Constantan
Iron Constantan
Chromel Alumel
Cobalt
T type thermocouple is combination of
Copper Constantan
Iron Constantan
Chromel Alumel
Cobalt
J type thermocouple+ve terminal
Iron
Constantan
chromel
Alumel
J type thermocouple -ve terminal
Iron
Constantan
chromel
Alumel
K type thermocouple+ve terminal
Copper
Constantan
iron
Chromel
