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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
The efficiency of reaction turbine is maximum when (where α = Angle made by the absolute velocity ‘V’ at inlet)

Vb = 0.5 V cosα
Vb = 0.5 V² cosα
Vb = V² cos α
Vb = V cos α

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Steam Boilers, Engines, Nozzles and Turbines
The discharge of steam in a convergent-divergent nozzle __________ after the throat (i.e. in the divergent portion of the nozzle)

Decreases
Remains constant
None of these
Increases

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Steam Boilers, Engines, Nozzles and Turbines
Which of the following is not a boiler mounting?

Fusible plug
Blow off cock
Feed check valve
Economiser

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Steam Boilers, Engines, Nozzles and Turbines
Water tube boilers are those in which

Change in enthalpy
Water passes through the tubes and flue gases around it
Work is done during adiabatic expansion
Flue gases pass through tubes and water around it

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Steam Boilers, Engines, Nozzles and Turbines
Steam turbines are used for

All of these
Large marine propulsion
Direct drive of fans, compressors, pumps
Electric power generation

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Steam Boilers, Engines, Nozzles and Turbines
Relative percentage of heat absorbed through the heat transfer of (i) Furnace water wall (ii) Boiler tank (iii) Superheater (iv) Economizer (v) Air-heater of a typical boiler of 200 MW capacity would be of the order of

7 : 15 : 20 : 10 : 48
10 : 7 : 15 : 20 : 48
20 : 48 : 7 : 15 : 10
48 : 20 : 15 : 7 : 10

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