The correct representation of a simple Rankine cycle on a T-s diagram is

1.  

2.  

3.  

4.  

View Answer  
4
Correct Answer :


Explanation :
No Explanation available for this question

A Brayton cycle (air standard) has a pressure ratio of 4 and inlet conditions of one standard atmospheric pressure and 200 C. Find the air flow rate required for 100 kW power output if the maximum temperature in the cycle is 10000 C. Assume γ =1.4 and cp=1.0 kJ/kg-k.

1.  0.24 kJ/kg

2.  0.32 kJ/kg

3.  0.36 kJ/kg

4.  0.42 kJ/kg

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4
Correct Answer :

0.36 kJ/kg


Explanation :
No Explanation available for this question

In an ideal air-standard Gas turbine cycle, the minimum and maximum temperatures are respectively 310 K and 1100 k. What will be the optimal pressure ratio of the cycle for maximum work output Assume for air(γ-1)/γ  is 0.29 where γ is the ratio of specific heats

1.  0.68

2.  0.78

3.  8.87

4.  0.92

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4
Correct Answer :

8.87


Explanation :
No Explanation available for this question

In a gas turbine, hot combustion products with the specific heats cp=0.98 kJ/kgK, and cv=0.7538 kJ/kg K enter the turbine at 20 bar; 1500 K and exit at 1 bar. The isoentropic efficiency of the turbine is 0.94. The developed by the turbine per kg of gass flow will be

1.  689.64 kJ/kg

2.  794.66 kJ/kg

3.  1009.72 kJ/kg

4.  1312.00 kJ/kg

View Answer  
4
Correct Answer :

689.64 kJ/kg


Explanation :
No Explanation available for this question

Otto cycle consists of sets of processes

1.  Adiabatic and constant volume

2.  Adiabatic and constant pressure

3.  Isothermal and constant pressure

4.  Isothermal and constant volume

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4
Correct Answer :

Adiabatic and constant volume


Explanation :
No Explanation available for this question

Otto cycle is a theoretical cycle, on which

1.  Only petrol engine run

2.  Only diesel engine run

3.  Only gas engines run

4.  Petrol and gas engine run

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4
Correct Answer :

Petrol and gas engine run


Explanation :
No Explanation available for this question

Diesel cycle consists of

1.  Two adiabatic and two constant volume processes

2.  Two adiabatic and two constant pressure processes

3.  Two adiabatic, one constant pressure and one constant volume processes

4.  Two isothermal, one constant pressure and one constant volume processes

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4
Correct Answer :

Two adiabatic, one constant pressure and one constant volume processes


Explanation :
No Explanation available for this question

For the same compression ratio, the efficiency of diesel cycle as compared to otto cycle is

1.  Less

2.  More

3.  Equal

4.  None of the above

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4
Correct Answer :

Less


Explanation :
No Explanation available for this question

The efficiency of diesel cycle approaches otto cycle efficiency with

1.  Increase in cut-off

2.  Decreases in cut-off

3.  Zero cut-off

4.  Constant cut-off

View Answer  
4
Correct Answer :

Zero cut-off


Explanation :
No Explanation available for this question

With decreases in cut-off, the efficiency of diesel cycle

1.  Increases

2.  Decreases

3.  Remains constant

4.  None of the above

View Answer  
4
Correct Answer :

Increases


Explanation :
No Explanation available for this question
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