A. Insulator
B. Conductor
C. Solid semi-conductor
D. Liquid semi-conductor
Related Mcqs:
- The ____________ of the fluid contained in the temperature sensing element (i.e., bulb) of filled system thermometers changes with change in temperature ?
A. Pressure
B. Volume
C. Viscosity
D. All A., B. and C. - 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. - 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 - Thermistors which have a very high temperature co-efficient of resistivity belong to the class of solid called________________?
A. Dielectrics
B. Insulators
C. Semi conductors
D. Conductors - Which of the following is never used as an element of industrial resistance thermometer ?
A. Lead
B. Nickel
C. Copper
D. 30% iron + 70% nickel - Which of the following is not a mechanical pressure sensing element ?
A. Bellows
B. Diaphragm
C. Bourdon tube
D. U-tube - The pressure sensing element of elastic type pressure gauge is never made in the form of a_________________?
A. Bellow
B. Diaphragm
C. Strip
D. Bourdon tube - To increase the speed of response of a pressure spring liquid or gas expansion thermometer, the clearance space between the thermometer bulb and the thermal well should not be filled with ________________?
A. Air
B. A metal powder or graphite
C. Oil
D. Mercury - A bimetallic thermometer as compared to industrial mercury in glass thermometer has almost the same_________________?
A. Temperature measuring range (- 40°C to 450°C)
B. Accuracy (± 1% of span)
C. Speed of response
D. All a, b & c - For increased speed of response of an expansion pressure spring thermometer, the thermometer bulb should have a__________________?
A. Large area but small mass
B. High thermal conductivity
C. Small specific heat
D. All A , B & C
