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Mechanical Engineering Objective Questions { Instrumentation and Control }



36. Which gauge is based on the change of heat conductivity of a gas with pressure and the change of electrical resistance of a wire with temperature :
A.Thermocouple gauge
B.Pirani gauge.
C.Ionization gauge
D.Nuitating disk gauge

37. Thermal expansion of a solid is employed in :
A.Thermocouple
B.Resistance thermometer
C.Bulb thermometer
D.Bimetal element

38. Col.d junction compensation is needed in case of measurement of temperature by :
A.Thermocouple
B.Thermopile
C.Thermistor
D.Zener diode

39. Which of the following consists of a very thin strip of nickel or platinum foil which responds to temperature in the same manner as the resistance thermometer :
A.Therm? pile
B.Bolometer
C.Radiation pyrometer
D.Thennistor

40. For measuring temperature in the range of ?20 to 600?C, following liquid is used in glass thermometer :
A.Mercury
B.Alcohol
C.Toluene
D.Pentane

41. For measuring temperature in the range of ?200 to 30?C, following liquid is used in glass thermometer :
A.Mercury
B.Alcohol
C.Toluene
D.Pentane

42. Which of the following glass is used for 500-600?C temperature measurement by mercury-in-glass thermometer :
A.Lead glass
B.Normal grade
C.Borosilicate
D.Supennax

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