Applied Thermodynamics 3rd. Edition by Onkar Singh | 9788122425833 | 8122425836 | Holooly

Applied Thermodynamics [EXP-8010]

340 SOLVED PROBLEMS

Question: 4.11

0.5 kg of air executes a Carnot power cycle having a thermal efficiency of 50%. The heat transfer to the air during isothermal expansion is 40 kJ. At the beginning of the isothermal expansion the pressure is 7 bar and the volume is 0.12 m^3. Determine the maximum and minimum temperatures for the cy

Verified Answer:

\begin{aligned}\text{Given :}\qquad \qquad ...

Question: 1.6

1 kg of water falls from an altitude of 1000 m above ground level. What will be change in the temperature of water at the foot of fall, if there are no losses during the fall. Take specific heat of water as 1 kcal/kg⋅K

Verified Answer:

Initially when water is at 1000 m, it shall have p...

Question: 7.7

10 kg of water undergoes transformation from initial saturated vapour at 150ºC, velocity of 25 m/s and elevation of 10 m to saturated liquid at 20ºC, velocity of 10 m/s and elevation of 3 m. Determine the availability for initial state, final state and change of availability considering environment

Verified Answer:

\text{Let us consider velocities and elevat...

Question: 7.3

15 kg/s steam enters a perfectly insulated steam turbine at 10 bar, 300ºC and leaves at 0.05 bar, 0.95 dry with velocity of 160 m/s. Considering atmospheric pressure to be 1 bar, 15ºC. Determine (a) power output, (b) the maximum power for given end states, (c) the maximum power that could be obtain

Verified Answer:

\text{From steam tables,}\\\begin{aligned}\...

Question: 1.25

2 kg of Hydrogen and 3 kg of Helium are mixed together in an insulated container at atmospheric pressure and 100 K temperature. Determine the specific heat of final mixture if specific heat at constant pressure is 11.23 kJ/kg. K and 5.193 kJ/kg . K for H2 and He respectively.

Verified Answer:

Two gases are non reacting, therefore, specific he...

Question: 18.3

3 hp per ton of refrigeration is required to maintain temperature of –27ºC in refrigerator working on Carnot cycle. Determine COP of cycle and temperature of surroundings to which heat is rejected by refrigerator.

Verified Answer:

\begin{aligned}COP&= \frac{T_{1}}{T_{2}...

Question: 3.22

3 kg of air at 1.5 bar pressure and 77°C temperature at state 1 is compressed polytropically to state 2 at pressure 7.5 bar, index of compression being 1.2. It is then cooled at constant temperature to its original state 1. Find the net work done and heat transferred. [U.P.S.C. 1992]

Verified Answer:

Different states as described in the problem are d...

Question: 7.4

5 kg of steam, initially at elevation of 10 m and velocity of 25 m/s undergoes some process such that finally it is at elevation of 2m and velocity of 10 m/s. Determine the availability corresponding to the initial and final states. Also estimate the change in availability assuming environment temp

Verified Answer:

\text{Availability at any state can be give...

Question: 7.11

500 kJ of heat is removed from a constant temperature heat reservoir maintained at 835 K. Heat is received by a system at constant temperature of 720 K. Temperature of the surroundings, the lowest available temperature is 280 K. Determine the net loss of available energy as a result of this irrever

Verified Answer:

\text{Here, }T_{0} =\text{ 280 K, i.e surro...

Question: 15.8

A barometric jet condenser has steam entering at the rate of 20 kg/min and 12 kg cooling water per kg of steam is supplied into it for condensation. After condensation the cooling water and condensate leave at 40°C. Cooling water enters the condenser at 20°C. Vacuum of 650 mm Hg is maintained insid

Verified Answer:

\begin{aligned}\text{Absolute pressure in c...

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