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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
In a steam condenser, the partial pressure of steam and air are 0.06 bar and 0.007 bar respectively. The condenser pressure is

0.06 bar
0.007 bar
0.053 bar
0.067 bar

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Steam Boilers, Engines, Nozzles and Turbines
The efficiency of an impulse turbine is maximum when (where Vb = Blade speed, V = Absolute velocity of steam entering the blade, and α = Nozzle angle)

Vb = 0.5 V² cosα
Vb = V² cosα
Vb = 0.5 V cosα
Vb = V cosα

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Steam Boilers, Engines, Nozzles and Turbines
A vessel into which the steam is exhausted and condensed after doing work in an engine cylinder or turbine is known as

Steam preheater
Economiser
Steam condenser
Steam boiler

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Steam Boilers, Engines, Nozzles and Turbines
The fire tubes in a Scotch marine boiler are

Vertical
Horizontal
None of the listed here
Inclined

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Steam Boilers, Engines, Nozzles and Turbines
The number of drums in Benson steam generator is

One steam drum and one water drum
Two
No drum
One

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Steam Boilers, Engines, Nozzles and Turbines
Natural water circulation, by convection in water tube boilers, with increase in pressure of boiler

Increases
Remain unaffected
First increases and then decreases
Decreases

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