146. It is required to measure temperature in the range of 1300° C t o 1500° C. The most suitable thermocouple to be used as a transducer would be
     

1. 1. Chromel-constantan

   
   
   

   2. Iron-constantan

   
   
   

   3. Chromel-alumel

   
   
   

   4. Platinum-rhodium

   
   
   

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   NA

   Correct Option: D

   NA

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147. Strain sensing transducers are mode of various materials in various sizes and shapes. The sensitivity of a strain gauge is expressed in terms of a gauge factor. For a certain application, a gauge factor of 100 is desired. The proper strain gauge to be used in this case would be
     

1. 1. constantan strain gauge

   
   
   

   2. nichroma-V strain gauge

   
   
   

   3. semiconductor strain gauge

   
   
   

   4. platinum-tungsten alloy strain gauge.

   
   
   

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   NA

   Correct Option: C

   NA

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148. A periodic signal shown is applied to the ideal diode circuit below. Find the RMS value for the output voltage v₀(t)?
     
     

1. 1. 10

   
   
   

   2. 2

   
   
   

   3. 1/√2

   
   
   

   4. √2

   
   
   

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   RMS or root mean square value is defined as
   
   The diode circuit provides full wave rectification.
   
   

   Correct Option: D

   RMS or root mean square value is defined as
   
   The diode circuit provides full wave rectification.
   
   

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149. Hysteresis in an instrument means
     

1. 1. repeatability of the instrument

   
   
   

   2. reliability of the instrument

   
   
   

   3. change in same reading when input is first increased and then decreased

   
   
   

   4. the inaccuracy due to change in temperature

   
   
   

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   NA

   Correct Option: C

   NA

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150. The RTDs use the principle of change of resistance with temperature. The properties of a conductor material to be used as an element of an RTD should possess which of the following properties?

1. 1. The change in resistance per unit change in temperature should be as small as possible

   
   
   

   2. The resistance of the materials should not have a continuous and stable relationship with temperature

   
   
   

   3. The change of resistance with temperature should not be a linear function

   
   
   

   4. All of these

   
   
   

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   NA

   Correct Option: D

   NA

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