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

The degree of reaction of an axial flow turbine is the ratio of isentropic temperature drop in a blade row to the

A

Adiabatic temperature drop in the stage

B

Total temperature drop

C

Total temperature drop in the stage

D

Total adiabatic temperature drop

A pitched-blade turbine draws __________ a straight blade turbine.

A

Less power than

B

More power than

C

Same power as

D

Data insufficient to predict

The blade friction in the impulse turbine reduces the velocity of steam by __________ while it passes over the blades.

A

10 to 15%

B

15 to 20%

C

20 to 30%

D

30 to 40%

The blade friction in the impulse turbine reduces the velocity of steam by _____ while it passes over the blades.

A

10-15%

B

15-20%

C

20-30%

D

30-40%

An impulse turbine as compared to a reaction turbine, for a given power has _________ row of blades.

A

Equal

B

Less

C

More

D

None of these

A turbine is said to have an axial discharge when the steam leaves the blade tip at _________ to the direction of the blade motion.

A

60°

B

90°

C

180°

D

270°

In a reaction turbine, when steam flows through the moving blades,

A

Pressure increases while velocity decreases

B

Pressure decreases while velocity increases

C

Pressure and velocity both decreases

D

Pressure and velocity both increases

In a reaction turbine, when steam flows through the fixed blades,

A

Pressure increases while velocity decreases

B

Pressure decreases while velocity increases

C

Pressure and velocity both decreases

D

Pressure and velocity both increases

The ratio of the useful heat drop to the isentropic heat drop is called

A

Condenser efficiency

B

Nozzle efficiency

C

Boiler efficiency

D

Vacuum efficiency

The ratio of total useful heat drop to the total isentropic heat drop, is called

A

Stage efficiency

B

Internal efficiency

C

Rankine efficiency

D

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

Related Questions