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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
The ratio of the clearance volume to the swept volume is called

Clearance ratio
Cut-off ratio
None of these
Expansion ratio

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Steam Boilers, Engines, Nozzles and Turbines
Size of boiler tubes is specified by

Inside diameter and thickness
Mean diameter and thickness
Outside diameter and thickness
Outside diameter and inside diameter

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Steam Boilers, Engines, Nozzles and Turbines
The velocity of whirl at outlet for an axial discharge turbine is

None of these
Zero
Maximum
Minimum

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Steam Boilers, Engines, Nozzles and Turbines
In order to obtain superheated steam, a superheater is added in an existing boiler. As as result, furnace vacuum will

Remain unaffected
Improve
May improve/worsen depending on size
Worsen

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Steam Boilers, Engines, Nozzles and Turbines
Calorific value of coal is of the order of

800-1200 kcal/ kg
5000-8000 kcal/ kg
2000-4000 kcal/ kg
200-400 kcal/ kg

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Steam Boilers, Engines, Nozzles and Turbines
The best suited coal for chain or traveling grate stoker boiler is

Non-coking or free burning coal
Pulverized coal
High sulphur coal
Coking coal

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