1. Choose the correct alternative for the following objective type questions

Which of the following is the basis temperature measurement?

Zeroth law of thermodynamics

First law of thermodynamics

Second law of thermodynamics

Law of stable equilibrium

The Kelvin temperature of a system can be measured by a

mercury-in-glass thermometer

thermocouple

constant-volume gas thermometer

resistance thermometer

Heat transferred to a closed stationary system at constant volume is equal to

work transfer

increase in internal energy

increase in enthalpy

None of the above

Which of the following does not change during a throttling process?

Enthalpy

Entropy

Volume

Pressure

Match List 1 with List 2 and choose the correct answer from the code:

List 1 List 2

(Law of thermodynamics) (Defines)

First I. Internal energy

Second II. Temperature

Zeroth III. Entropy AB C

I II III

II III I

III I II

I III II

If the thermal efficiency of a Carnot engine is 1/5t the COP of a Carnot refrigerator is

5

4

6

3

The entropy of a system

can never decrease

can never increase

may increase or decrease

will always remain constant

2. Answer any two of the following questions:

In a cyclic process, heat transfers are 14·7 kJ, -25·2 kJ, -3·56 kJ and 31·5 kJ. What is the net work for this cyclic process

A mass of gas is compressed from 80 kPa, 0·1 m3 to 0·4 MPa, 0·03 m3. Assuming that the pressure and volume are related by

constant,

find the work done by the gas system.

A stationary mass of gas is compressed without friction from an initial state of 0·3 m^3 and 0·105 MPa to a final state of 0·15 m^3 and 0·105 MPa, the pressure remaining constant during the process. There is a transfer of 37·6 kJ of heat from the gas during the process. How much does the internal energy of the gas change?

3. Answer any two of the following questions:

Explain Clausius' statement of the second law of thermodynamics.

Define Entropy. What are the causes of entropy increase?

Steam initially at 1·5 MPa, 300°C expands reversibly and adiabatically in a steam turbine to 40°C. Determine the ideal work output of the turbine per kg of steam.

4. Answer any two of the following questions:

Show that the COP of a heat pump is greater than the COP of a refrigerator by unity.

A rigid vessel of volume 0·86 m^3 contains 1 kg of steam at a pressure of 2 bar. Evaluate the specific volume, temperature, dryness fraction, internal energy and enthalpy of steam.

What is the effect of regeneration on the specific output and cycle efficiency of a steam power plant?

5. Write short notes on any four of the following:

Nozzles

Impulse Turbine

Cooling Towers

Black Body

Stefan-Boltzmann Law

Geothermal Energy