56. In a Rankine cycle heat is added
    

1. 1. Reversibly at constant volume
      

   
   
   

   2. Reversibly at constant temperature
      

   
   
   

   3. Reversibly at constant pressure and temperature
      

   
   
   

   4. Reversibly at constant pressure

   
   
   

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   Reversibly at constant pressure

   Correct Option: D

   Reversibly at constant pressure

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57. In the Rankine cycle when superheated steam is used
    

1. 1. Thermal efficiency increases
      

   
   
   

   2. Steam consumption decreases
      

   
   
   

   3. Steam dryness after expansion increases
      

   
   
   

   4. All of the above

   
   
   

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1. View Hint View Answer Discuss in Forum

   N/A

   Correct Option: D

   N/A

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58. In a gas turbine power plant intercooler are used to cool the ____ in order to decrease the ______.

1. 1. hot gases

   
   
   

   2. compressed air

   
   
   

   3. expansion work

   
   
   

   4. compression work

   
   
   

   5. Compressed air ; compression work

   
   
   

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   Intercoolers are used to cool compressed air so that the compression work can be reduced and more air means can be supplied to turbine.

   Correct Option: E

   Intercoolers are used to cool compressed air so that the compression work can be reduced and more air means can be supplied to turbine.

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59. The fundamental objective of employing the condenser in a steam power plant is to _____ (reduce/increase) the dryness fraction of steam.

1. 1. increase

   
   
   

   2. reduce

   
   
   

   3. decrease

   
   
   

   4. increase and decrease

   
   
   

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   Reduce

   Correct Option: B

   Reduce

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60. For a compressible fluid, sonic velocity is
    

1. 1. a property of the fluid
      

   
   
   

   2. always given by √γ RT where γ , R and T are respectively the ratio of specific heats, gas constant and temperature in K
      

   
   
   

   3. always given by		∂p		1/2	s, where p, ρ and s are respectively pressure, density and entropy
      		∂ρ

      
      

   
   
   

   4. always greater then the velocity of fluid at any location

   
   
   

   5. Both A and B

   
   
   

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1. View Hint View Answer Discuss in Forum

   Here , Options A and B are correct answer .

   Correct Option: E

   Here , Options A and B are correct answer .

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