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GATE ME 2021 : Thermodynamics & Applications Quiz 11 (App update required to attempt this test)

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Question 1

In Rankine cycle, the work output from the turbine is given by __________.

Question 2

If a reheater is added to a Rankine Cycle, then usually ___________.

Question 3

In a steam power plant, superheated steam at 10 MPa and 500°C, is expanded isentropically in a turbine until it becomes a saturated vapour. It is then reheated at constant pressure to 500°C. The steam is next expanded isentropically in another turbine until it reaches the condenser pressure of 20 kPa. Relevant properties of steam are given in the following two tables. The work done by both the turbines together is _______ kJ/kg (round off to the nearest integer).

Superheated Steam Table:

Saturated Steam Table:

Question 4

A steam plant has the boiler efficiency of 82%, turbine efficiency (mechanical) of 84%, generator efficiency of 85%. If 6% of the generated power is used to run the auxiliaries, the overall plant efficiency is ___________.

Question 5

A powerplant operating on the Rankine cycle has steam entering the turbine at 15 MPa and 700°C [h=3375.1 kJ/kg , s=6.5995kJ/kg K]. The steam is then cooled eventually to a condenser pressure of 25 kPa.
At 25 kPa, h_f = 191.81kJ/kg, s_f = 0.6492kJ/kgK, h_g = 2583.9 kJ/kg and s_g = 8.1488kJ/kgK. The magnitude of the heat rejected in the condenser is _______ kJ/kg

Question 6

In a regenerative Rankine cycle, cold feed-water enters in a open feed-water heater at 200 kPa, 90^o C with an enthalpy of 293.07 kJ/kg at a rate of 10 kg/s. Bleed steam is available from the turbine at 200 kPa and 160^o C with an enthalpy of 2789.7 kJ/kg. If feed-water leaves this unit as saturated liquid with an enthalpy of 504.71 kJ/kg, then find the rate (in kg/s) at which bleed steam must be supplied to open feed-water heater

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ESE & GATE ME Thermodynamics

Jun 12ESE & GATE ME