Given that the critical point and triple point data for water are Tc=3740C, PC=22.1 MPa TT=0.010c, pT=0.6 k Pa Indicate the phase change that will occur in following cases Ice at o.5 kPa is heated isobarically Water vapour at 4000C is compressed isothermally

1.  (i) Along AB, (ii) along CD

2.  (i) along CD, (ii) along AB

3.  (i) along OD, (ii) along PR

4.   (i) along RD, (ii) along OR

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Correct Answer :

(i) Along AB, (ii) along CD


Explanation :
No Explanation available for this question

For a pure substance at its triple point, the number of degrees of freedom is

1.  0

2.  1

3.  2

4.   None of these

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Correct Answer :

0


Explanation :
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The state of a real gas if changed from pressure p1 temperature T1 to pressure p2 temperature T2. The change in enthalpy, h2-h1, is given by

1.  

2.  

3.  

4.  

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Correct Answer :


Explanation :
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The value of compressibility factor approximately unity when Where, p = pressure T = temperature Pc = critical pressure TC = critical temperature

1.  P = pc, T = TC

2.  P = 0

3.  T = 10 Tc p < pc

4.  None of these

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Correct Answer :

P = 0


Explanation :
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The equivalent evaporation (kg/hr) of a boiler producing 2000 kg/hr of steam with enthalpy content of 2426 kJ/kg from feed water at temperature 400c liquid enthalpy=168 kJ/kg enthalpy of vaporization of water at 1000C=2258 kJ/kg )is

1.  2000

2.  2149

3.  1682

4.  1649

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Correct Answer :

2000


Explanation :
No Explanation available for this question

The practice to use steam on the shell side and cooling water on the tube side. It condenser of steam power plant is because

1.  To increase overall heat transfer coefficient water side velocity can be increased if water is on the tube side

2.  Condenser can act as a storage unit for condensed steam

3.  Rate of condensation of steam is invariably smaller than the mass flow rate of cooling water

4.  It is easier to maintain vacuum on the shell side than on the side

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4
Correct Answer :

To increase overall heat transfer coefficient water side velocity can be increased if water is on the tube side


Explanation :
No Explanation available for this question

In adiabatic flow with friction, the stagnation temperature along a streamline

1.  Increases

2.  Decreases

3.  Remains constant

4.  Either increases or decreases

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Correct Answer :

Remains constant


Explanation :
No Explanation available for this question

A mixture of gases expands from 0.03 m3 at a constant pressure of 1 MPa and absorbs 84 kJ of heat during the process. The change in internal energy of the mixture is

1.  30 kJ

2.  54kJ

3.  84kJ

4.  114kJ

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4
Correct Answer :

54kJ


Explanation :
No Explanation available for this question

Match List-I wish List –II and select the correct answer using the codes given below the lists List-I List-II (A) Mechanical work equation 1.Claudius - Claperyron (B) ∫(dQ/T) ≤ 0 2.Gibb’s equation (C) Zeroth LAW 3.High grade energy (D) H-Ts 4.Concept of temperature

1.  A         B         C        D 1          3          2         4

2.  A         B         C        D  3         1          2          4

3.  A         B         C        D 4         2         3        1

4.  A         B         C        D 3         1         4       2

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Correct Answer :

A         B         C        D

3         1         4       2


Explanation :
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Which one of the following is not applicable to involutes profile

1.  The angular velocity ratio when two involutes are in mesh, is inversely proportional to the size of the base circle

2.  No involutes has a pressure angle until it is brought in contact with other mating involutes

3.  Involutes is the only tooth from that is not sensitive to centre distance of their base circle

4.   Pitch diameters of mating involutes are inversely proportional to their base circle diameters

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4
Correct Answer :

Pitch diameters of mating involutes are inversely proportional to their base circle diameters


Explanation :
No Explanation available for this question
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