201. Which combination of the following statements is correct?
     The incorporation of reheater in a steam power plant:
     P: Always increases the thermal efficiency of the plant.
     Q: Always increases the dryness fraction of steam at condenser inlet.
     R: Always increases the mean temperature of heat addition.
     S: Always increases the specific work output.

1. 1. P and S

   
   
   

   2. Q and S

   
   
   

   3. P, R and S

   
   
   

   4. P, Q, R and S

   
   
   

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1. View Hint View Answer Discuss in Forum

   Reheater always increases the dryness fractions of steam at condensor inlet. Always increases the specific work output.

   Correct Option: B

   Reheater always increases the dryness fractions of steam at condensor inlet. Always increases the specific work output.

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202. Group-I shows different heat addition processes in power cycles. Likewise, Group-II shows different heat removal processes. GroupIII lists power cycles. Match items from Groups I, II and III.
     

     Group I	Group II	Group III
     P. Pressure constant	S. Pressure constant	1. Rankine cycle
     Q. Volume constant	T. Volume constant	2. Otto cycle
     R. Temperature	U. Temperature	3. Carnot cycle
     		4. Diesel cycle
     		5. Brayton cycle

1. 1. P–S–5, R–U–3, P–S–1, Q–T–2

   
   
   

   2. P–S–1, R–U–3, P–S–4, P–T–2

   
   
   

   3. R–T–3, P–S–1, P–T–4, Q–S–5

   
   
   

   4. P–T–4, R–S–3, P–S–1, P–S–5

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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203. Determine the correctness or otherwise of the following Assertion (A) and the Reason (R).
     Assertion (A):Condenser is an essential equipment in a steam power plant.
     Reason (R): For the same mass flow rate and the same pressure rise, a water pump requires substantially less power than a steam compressor.

1. 1. Both (A) and (R) are true and (R) is the correct reason for (A)

   
   
   

   2. Both (A) and (R) are true but (R) is NOT the correct reason for (A)

   
   
   

   3. Both (A) and (R) are false

   
   
   

   4. (A) is false but (R) is true

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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204. Determine the correctness or otherwise Assertion (A) and the Reason (R).
     Assertion (A): In a power plant working on a Rankine cycle, the regenerative feed water heating improves the efficiency of the steam turbine.
     Reason (R): The regenerative feed water heating raises the average temperature of heat addition in the Rankine cycle.

1. 1. Both (A) and (R) are true and (R) is the correct reason for (A)

   
   
   

   2. Both (A) and (R) are true but (R) is NOT the correct reason for (A)

   
   
   

   3. Both (A) and (R) are false

   
   
   

   4. (A) is false but (R) is true

   
   
   

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1. View Hint View Answer Discuss in Forum

   In a regenerative the heat added in low temperature range is reduced which increase heat addition temperature.

   Correct Option: A

   In a regenerative the heat added in low temperature range is reduced which increase heat addition temperature.

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205. Given below is an extract from steam tables.
     
     Specific enthalpy of water in kJ/kg at 150 bar and 45°C is

1. 1. 203.60

   
   
   

   2. 200.53

   
   
   

   3. 196.38

   
   
   

   4. 188.45

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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