STEAM BOILERS, ENGINES, NOZZLES AND TURBINES QUIZ

The length of Lancashire boiler varies from

9 to 10 m

6 to 7 m

7.25 to 9 m

5 to 6 m

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A stage, in reaction turbine, is represented by

Each row of blades

Number of exits of steam

Number of entries of steam

Number of casing

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The rate of discharge through the nozzle ___ when the exit pressure is gradually reduced.

Remains same

Decreases

None of the listed here

Increases

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The impulse turbine rotor efficiency will have a maximum value of 0.5 cos 2α, where α is the nozzle exit flow angle, if the

Blade velocity coefficient is unity

Blades are equiangular

Blade solidity is 0.65

Blades are equiangular and frictionless

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Duplex feed pumps are used in small steam boilers. These operate on the principle of

Axial flow pump

Reciprocating pump

Gear pump

Centrifugal pump

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A supercritical boiler is one that operates above the pressure and temperature of following values

1 kg/cm² and 100°C

100 kg/cm² and 540°C

218 kg/cm² abs and 540°C

218 kg/cm² abs and 373°C

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Thermal equilibrium means that the flow of steam is

Hyperbolic

Isothermal

Isentropic

Polytropic

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The high pressure and low pressure cylinders in a receiver type compound engine are regarded as having cranks

0° to each other

180° to each other

90° to each other

None of these

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The ratio of brake power to the indicated power is known as

Indicated thermal efficiency

Brake thermal efficiency

Overall efficiency

Mechanical efficiency

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Size of boiler tubes is specified by

Inside diameter and thickness

Mean diameter and thickness

Outside diameter and inside diameter

Outside diameter and thickness

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