Related Questions

The blade friction in the impulse turbine reduces the velocity of steam by __________ while it passes over the blades.
ক 10 to 15%
খ 15 to 20%
গ 20 to 30%
ঘ 30 to 40%
In impulse turbines, when friction is neglected, the relative velocity of steam at outlet tip of the blade is _________ the relative velocity of steam at inlet tip of the blade.
ক Equal to
খ Less than
গ Greater than
ঘ None of these
In a velocity compounded impulse turbine, when steam flows through the second row of moving blades,
ক Velocity increases
খ Velocity decreases
গ Velocity remains constant
ঘ Pressure remains constant
The efficiency of a pressure-velocity compounded impulse turbine is __________ as compared to pressure compounded impulse turbine.
ক Same
খ Less
গ More
ঘ None of these
A pitched-blade turbine draws __________ a straight blade turbine.
ক Less power than
খ More power than
গ Same power as
ঘ Data insufficient to predict
A turbine is said to have an axial discharge when the steam leaves the blade tip at _________ to the direction of the blade motion.
ক 60°
খ 90°
গ 180°
ঘ 270°
An impulse turbine as compared to a reaction turbine, for a given power has _________ row of blades.
ক Equal
খ Less
গ More
ঘ None of these
The isentropic enthalpy drop in moving blade is two-third of the isentropic enthalpy drop in fixed blades of a turbine. The degree of reaction will be
ক 0.4
খ 0.56
গ 0.67
ঘ 1.67
The expansion of steam, as it flows over the blades in reaction turbine, represents
ক Isothermal process
খ Isentropic process
গ Throttling process
ঘ Free expansion process
The pressure compounded impulse turbine as compared to velocity compounded turbine require __________ number of stages.
ক Same
খ Less
গ More
ঘ None of these

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