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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
The friction in the nozzle __________ exit velocity of steam.

Increases
Has no effect on
None of these
Decreases

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Steam Boilers, Engines, Nozzles and Turbines
The friction present between the steam and the nozzle surfaces reduces the heat drop by

15 to 25%
25 to 40%
10 to 15%
40 to 60%

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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

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

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Steam Boilers, Engines, Nozzles and Turbines
In order to compare the capacity of boilers, the feed water temperature and working pressure are taken as

50°C and 1.1 bar pressure
100°C and normal atmospheric pressure
50°C and normal atmospheric pressure
100°C and 1.1 bar pressure

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Steam Boilers, Engines, Nozzles and Turbines
The working pressure range for a LaMont boiler is

0.5 to 10 MN/m²
3.5 to 20 MN/m²
1 to 15 MN/m²
2.5 to 15 MN/m²

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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?

Babcock and Wilcox boiler
Cornish boiler
Locomotive boiler
Lancashire boiler

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