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GATE 2019: Thermodynamics Quiz 12
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Question 1
Gas turbine works on:
Question 2
In a 3-stage air compressor, the inlet pressure is p1, discharge pressure is p4 and the intermediate pressure are p2 and p3 (p2 < p3). The total pressure ratio of the compressor is 10 and the pressure ratios of the stages are equal. If p1= 100 kPa, the value of the pressure p3 (in kPa. is_____
Question 3
A small steam whistle (perfectly insulated and doing no shaft work) causes a drop of 0.8 kJ/kg in the enthalpy of steam from entry to exit. If the kinetic energy of the steam at entry is negligible, the velocity of the steam at exit is
Question 4
In an ideal Brayton cycle with regeneration, air is compressed from 1 bar and 300 K to 4 bar and 450 K, is heated to 750 K in the regenerator, and then further heated to 1200 K before entering the turbine. Under cold-air standard conditions, the effectiveness of the regenerator (in percentage) is _____ [Take = 1.3 for gas]
Question 5
In a gas turbine, hot combustion products enter the turbine at 18 bar 1400 K and exit at 1 bar. The isentropic efficiency of turbine is 0.96. Ratio of specific heats for combustion product is 1.3 and CV = 0.77kJ/kg-k. The work developed by the turbine is __________ kJ/kg.
Question 6
The values of enthalpy of steam at the inlet and outlet of a steam turbine in a Rankine cycle are 2800 kJ/kg and 1800 kJ/kg respectively. Neglecting pump work, the specific steam consumption in kg/kW-hour is
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