Related Questions

In a steam engine, superheated steam from the boiler is fed into the steam chest at a pressure of
A 10 atmospheres
B 20 atmospheres
C 30 atmospheres
D 40 atmospheres
The critical pressure ratio for initially superheated steam is __________ as compared to initially dry saturated steam.
A More
B Less
C Same
D None of these
The ratio of exit pressure to inlet pressure of maximum mass flow rate per area of steam through a nozzle when steam is initially superheated is
A 0.555
B 0.578
C 0.5457
D 0.6
The isentropic expansion of steam through nozzle for the steam initially superheated at inlet is approximated by equation
A pvls=C
B pv1126 = C
C pv1A = C
D pv = C
Dry saturated steam can be converted into superheated steam by
A Increasing its cross-sectional area of flow
B Passing it through a pressure reducing valve
C Forcing it downwards through a vertical tube
D None of these
Which of the following identities can be most easily used to verify steam table data for superheated steam.
A $${\left( {\frac{{\partial {\text{T}}}}{{\partial {\text{V}}}}} \right)_{\text{S}}} = {\left( {\frac{{\partial {\text{P}}}}{{\partial {\text{S}}}}} \right)_{\text{V}}}$$
B $${\left( {\frac{{\partial {\text{T}}}}{{\partial {\text{P}}}}} \right)_{\text{S}}} = {\left( {\frac{{\partial {\text{V}}}}{{\partial {\text{S}}}}} \right)_{\text{P}}}$$
C $${\left( {\frac{{\partial {\text{P}}}}{{\partial {\text{T}}}}} \right)_{\text{V}}} = {\left( {\frac{{\partial {\text{S}}}}{{\partial {\text{V}}}}} \right)_{\text{T}}}$$
D $${\left( {\frac{{\partial {\text{V}}}}{{\partial {\text{T}}}}} \right)_{\text{P}}} = - {\left( {\frac{{\partial {\text{S}}}}{{\partial {\text{P}}}}} \right)_{\text{T}}}$$
In order to obtain superheated steam, a superheater is added in an existing boiler. As as result, furnace vacuum will
A Remain unaffected
B Improve
C Worsen
D May improve/worsen depending on size
Superheated steam is generated in following reactor
A Boiling water
B Gas cooled
C Pressurised water
D All of the above
It is not preferable to use superheated steam in evaporators, because of its very
A High temperature
B High pressure
C Low film co-efficient
D None of these
Air is to be heated by condensing steam. Two heat exchangers are available (i) a shell and tube heat exchanger and (ii) a finned tube heat exchanger. Tube side heat transfer area are equal in both the cases. The recommended arrangement is
A Finned tube heat exchanger with air inside and steam outside
B Finned tube heat exchanger with air outside and steam inside
C Shell and tube heat exchanger with air inside tubes and steam on shell side
D Shell and tube heat exchanger with air on shell side and steam inside tubes

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