MI MCQ SET3

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