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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
In a 50% reaction turbine stage, tangential component of absolute velocity at rotor inlet is 537 m/s and the blade velocity is 454 m/s. The power output in kW of steam will be

260 kW
282 kW
302 kW
296 kW

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Steam Boilers, Engines, Nozzles and Turbines
Heating value of fuel used is as on fired basis. If it is reported for dry or moisture free fuel, then latter should be multiplied by the following factor to correct for as fired value

(1- moisture content)
(1 + moisture content)
1 – moisture content
1 + moisture content

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Steam Boilers, Engines, Nozzles and Turbines
The diameter of Cornish boiler varies from

0.5 to 1 m
1.25 to 2.5 m
2 to 3 m
1 to 2 m

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Steam Boilers, Engines, Nozzles and Turbines
Which of the following is correct? (Where pa = Actual mean effective pressure, pm = Theoretical mean effective pressure, and K = Diagram factor)

pa = pm + K
pa = pm × K
pa = K/pm
pa = pm/K

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Steam Boilers, Engines, Nozzles and Turbines
The function of a cross-head is to guide motion of the _________ and to prevent it from bending.

Valve rod
Eccentric rod
Piston rod
Connecting rod

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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

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

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