Applied Thermodynamics - II Mid - I, September - 2014

1.The theoretical cycle on which the steam turbine works
  • Carnot Cycle
  • Rankine Cycle
  • Otto cycle
  • none of the above
Answer: B
2.Rankine cycle efficiency reaches
  • (h1 - h2) / (h1 - hf2)
  • (h1 + h2) / (h1 - hf2)
  • (h1 - h2) / (h1 + hf2)
  • none
Answer: A
3.The thermal efficiency of the cycle can be improved by _________ the average temperature at which heat is added to the cycle.
  • decrease
  • equal
  • increase
  • none
Answer: C
4.The common chimney produces the draught type
  • induced
  • forced
  • natural
  • none of above
Answer: C
5.Steel chimney can produce ______ draught than brick chimney with same height
  • more
  • less
  • equal
  • more or less
Answer: A
6.The efficiency of chimney is approximately
  • 10%
  • 25%
  • 40%
  • 0.25%
Answer: D
7.In steam nozzle heat energy of steam is converted in to
  • Potential energy
  • kinetic energy
  • internal energy
  • none
Answer: B
8.Velocity in steam nozzle C =
  • 44.72(k.hd)1/2
  • 74.72(k.hd)1/2
  • 44.72(k.hd)3/2
  • 74.72(k.hd))3/ 2
Answer: A
9.Steam turbine is a prime mover in which the ______ energy of the steam is ransferred in to ______ energy.
  • kinetic, potential
  • kinetic, mechanical
  • Potential, kinetic
  • none of the above
Answer: C
10.For maximum discharge in steam nozzle is
  • m = A.V/v kg/sec
  • m = A.v/V kg/sec
  • m = A.V.v kg/sec
  • none
Answer: A
11.In Rankine cycle the work out put from the turbine is given by change of _________ between inlet and outlet.
Answer: Enthalpy
12.Regenerative cycle thermal efficiency is always __________ than rankine cycle thermal efficiency.
Answer: Greater
13.The improvement in thermal efficiency due to reheat is greatly dependent upon __________________ with respect to the original pressure of steam.
Answer: Pressure
14.There is no difference between steam generating unit and _________.
Answer: Boiler
15.If the axis is vertical, it is called a ___________ boiler.
Answer: Water boiler
16.Steam injector is used to supply _________ water to boiler.
Answer: Feed water
17.The temperature difference between T2 and TR is called degree of _______________.
Answer: Super cooling
18.Work done on blade/sec = Force x ____________________ .
Answer: Distance traveled/sec
19.The efficiency of impulse turbine is _______ when compared to Reaction turbine.
Answer: Low
20.Area of blades in impulse turbine is ________________.
Answer: Constant