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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
The efficiency of the plant __________ with the mechanical draught.

Decreases
None of these
Remains constant
Increases

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Steam Boilers, Engines, Nozzles and Turbines
Mechanical equivalent of heat for 1 kcal or Joule's equivalent is equal to

102 kg.m
539 kg.m
421 kg.m
421 kg.m

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Steam Boilers, Engines, Nozzles and Turbines
A single stage impulse turbine with a diameter of 1.2 m runs at 3000 r.p.m. If the blade speed ratio is 0.42, then the inlet velocity of steam will be

450 m/s
79 m/s
900 m/s
188 m/s

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Steam Boilers, Engines, Nozzles and Turbines
Which of the following boiler is best suited to meet the fluctuating demand of steam?

Lancashire boiler
Cornish boiler
Babcock and Wilcox boiler
Locomotive boiler

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Steam Boilers, Engines, Nozzles and Turbines
The maximum steam pressure in a Locomotive boiler is limited to

18 MN/m²
180 MN/m²
1.8 MN/m²
0.18 MN/m²

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Steam Boilers, Engines, Nozzles and Turbines
On Mollier chart, free expansion, or throttling process from high pressure to atmosphere is represented by

Horizontal straight line
Vertical straight line
Straight inclined line
Curved line

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