Applied Thermodynamics - II Mid - I, September - 2014

August 04, 2015     VIKRAM     583

1.

The theoretical cycle on which the steam turbine works

• A.

Carnot Cycle

• B.

Rankine Cycle

• C.

Otto cycle

• D.

none of the above

2.

Rankine cycle efficiency reaches

• A.

(h- h2) / (h- hf2)

• B.

(h+ h2) / (h- hf2)

• C.

(h- h2) / (h+ hf2)

• D.

none

3.

The thermal efficiency of the cycle can be improved by _________ the average temperature at which heat is added to the cycle.

• A.

decrease

• B.

equal

• C.

increase

• D.

none

4.

The common chimney produces the draught type

• A.

induced

• B.

forced

• C.

natural

• D.

none of above

5.

Steel chimney can produce ______ draught than brick chimney with same height

• A.

more

• B.

less

• C.

equal

• D.

more or less

6.

The efficiency of chimney is approximately

• A.

10%

• B.

25%

• C.

40%

• D.

0.25%

7.

In steam nozzle heat energy of steam is converted in to

• A.

Potential energy

• B.

kinetic energy

• C.

internal energy

• D.

none

8.

Velocity in steam nozzle C =

• A.

44.72(k.hd)1/2

• B.

74.72(k.hd)1/2

• C.

44.72(k.hd)3/2

• D.

74.72(k.hd))3/ 2

9.

Steam turbine is a prime mover in which the ______ energy of the steam is ransferred in to ______ energy.

• A.

kinetic, potential

• B.

kinetic, mechanical

• C.

Potential, kinetic

• D.

none of the above

10.

For maximum discharge in steam nozzle is

• A.

m = A.V/v kg/sec

• B.

m = A.v/V kg/sec

• C.

m = A.V.v kg/sec

• D.

none

11.

In Rankine cycle the work out put from the turbine is given by change of _________ between inlet and outlet.

12.

Regenerative cycle thermal efficiency is always __________ than rankine cycle thermal efficiency.

13.

The improvement in thermal efficiency due to reheat is greatly dependent upon __________________ with respect to the original pressure of steam.

14.

There is no difference between steam generating unit and _________.

15.

If the axis is vertical, it is called a ___________ boiler.

16.

Steam injector is used to supply _________ water to boiler.

17.

The temperature difference between T2 and TR is called degree of _______________.

18.

Work done on blade/sec = Force x ____________________ .

19.

The efficiency of impulse turbine is _______ when compared to Reaction turbine.

20.

Area of blades in impulse turbine is ________________.