RRB/SSC JE Mech: POWER PLANT Quiz 1

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Question 1

The gas in a cooling chamber of a closed-cycle gas turbine is cooled at

• Aconstant volume
• Bconstant temperature
• Cconstant pressure
• DNone of the above

Question 2

The index of expansion of dry saturated steam flowing through a nozzle is equal to 1.135, and then what is the critical pressure ratio for this flowing steam in the nozzle?

• A0.96
• B0.58
• C0.33
• D0.15

Question 3

A Rankine cycle operates between pressures of 80 bar and 0.1 bar. The maximum cycle temperature is 600 °c. Relevant steam table extract is given below. Thermal efficiency of the cycle is ____ %.

• A21.05
• B35.34
• C40.90
• D49.12

Question 4

Gas turbine cycle with regenerator improves

• Awork ratio
• Bpower output
• Cthermal efficiency
• Dexhaust presure

Question 5

Atmospheric air at 101.325 kPa and 27 °C enters the compressor of a gas turbine operating on Brayton cycle which is having a pressure ratio of 6 (= 1.4). If the turbine work is 2.5 times the work of compressor then the maximum temperature in the cycle will be

• A950
• B1550
• C1100
• D1250

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