Thermistors which have a very high temperature co-efficient of resistivity belong to the class of solid called________________?

Related Mcqs:

1. Thermistor, which has high temperature co-efficient of resistivity, is used as the sensing element in resistance thermometer. It is a/an ?

   A. Insulator B. Conductor C. Solid semi-conductor D. Liquid semi-conductor...

2. Thermistors are made of__________________?

   A. Ultra pure metals B. Metal oxides C. Iron-copper alloys D. Nickel-chromium alloys...

3. Thermistors are used in ____________ devices?

   A. Voltage measuring B. Temperature measuring C. Temperature compensating D. Both B. & C....

4. Working principle of bimetallic thermometers is difference in linear co-efficient of thermal expansion of two strips of different metals welded together. Which of the following has the maximum thermal co-efficient of linear expansion ?

   A. Nickel B. Brass C. Chromel D. Invar...

5. Water is entering a storage tank at a temperature T0 and flow rate Q0 and leaving at a flow rate Q and temperature T. There are negligible heat losses in the tank. The area of cross-section of the tank is A0. The model that describes the dynamic variation of temperature of water in the tank with time is given as________________?

   A. Q0(T0 – T) = Ac . h (dT/dt) B. Q0T0 – QT = Ac . h (dT/dt) C. Q(T0 – T) = Ac . h (dT/dt) D. Q(T0 – T) = Ac . (dTH/dt)...

6. Platinum resistance thermometer can be used upto antimony point which is ____________ °C, and is the temperature of equilibrium between solid antimony & liquid antimony at normal atmospheric pressure?

   A. 961.93 B. 630.74 C. 1064.43 D. 1261.93...

7. High temperature of around 2000°C of incandescent gas mantles is measured by a/an __________________?

   A. Specially designed thermocouple B. Optical pyrometer C. Radiation pyrometer D. None of these...

8. Vapour actuated pressure spring thermometer does not require ambient temperature compensation. Ambient temperature compensation is provided in gas or liquid expansion pressure spring thermometer by__________________?

   A. Making the volume of thermometer bulb as large as conveniently possible B. Reducing the volume of the capillary to a minimum C. Reducing the volume of the receiving element to a minimum D. All A , B & C....

9. Which of the following temperature measuring instruments need not touch the object whose temperature is being measured ?

   A. Radiation/infrared pyrometer B. Filled system thermometer C. Mercury in glass thermometer D. Thermo electric pyrometer...

10. Ordinary mercury in glass thermometer is used for measuring temperature upto 120°C. However, for measuring higher temperature upto __________ °C, thermometer is made by filling nitrogen under pressure above the mercury, which stops the evaporation of mercury and reduces the chance of broken thread of mercury?

    A. 250 B. 350 C. 550 D. 700...