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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
Pick up wrong statement about desired properties of a good fuel

Ease in storing
Produce minimum smoke and gases
High calorific value
High ignition point

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Steam Boilers, Engines, Nozzles and Turbines
The pressure velocity compounded impulse turbine allows a bigger pressure drop and hence __________ numbers of stages are required.

Less
None of the listed here
Equal
More

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Steam Boilers, Engines, Nozzles and Turbines
In impulse turbines, when friction is neglected, the relative velocity of steam at outlet tip of the blade is _________ the relative velocity of steam at inlet tip of the blade.

Greater than
Less than
Equal to
None of these

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Steam Boilers, Engines, Nozzles and Turbines
The ratio of the workdone on the blades to the energy supplied to the blades, is called

Mechanical efficiency
Gross or stage efficiency
Nozzle efficiency
Blading efficiency

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Steam Boilers, Engines, Nozzles and Turbines
The critical pressure ratio for gases is

0.582
0.528
0.577
0.546

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Steam Boilers, Engines, Nozzles and Turbines
The diameter of cylindrical shell of the Lancashire boiler is of the order of

2 to 4 m
1 to 1.25 m
1.75 to 2.75 m
1 to 1.75 m

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