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37.

Accuracy of standard pressure gauges, used for testing and calibration purposes is of the order of :                        
A. ± 1.5% B. ± 1%
C. ± 0.5% D. ± 0.25%



38.

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. Bourdon gauge
C. Ionization gauge D. nuitating disk gauge



39.

Which of the following have relatively large and negative temperature coefficients of resistance :                        
A. radiation pyrometers B. optical pyrometers
C. thermistors D. platinum resistance detectors




40.

Thermal expansion of a solid is employed in :                        
A. thermocouple B. resistance thermometer
C. bulb thermometer D. bimetal element



41.

Cold junction compensation is needed in ase of measurement of temperature by :                        
A. thermocouple B. thermopile
C. thermistor D. zener diode



42.

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. thermo pile B. bolometer
C. radiation pyrometer D. thermistor



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