Two Mark Questions & Answers | Module 5 | Psychometry

PSYCHOMETRY 1. What is humidification and dehumidification?The addition of water vapour into air is humidification and the removal of water vapour from air is dehumidification. 2. Differentiate absolute humidity and relative humidity.Absolute humidity is the mass of water vapour present in one kg of dry air. Relative humidity is the ratio of the actual mass of water vapour present in one kg of dry air at the given temperature to the maximum mass of  water vapour it can with hold at the same temperature. Absolute humidity is expressed in terms of kg/kg of dry air. Relative humidity is expressed in terms of percentage. 3. What is effective temperature?The effective temperature is a measure of feeling warmth or cold to the human body in response to the air temperature, moisture...

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Two Mark Questions & Answers | Module 4 | Ideal & Real Gases & Thermodynamic Relations

IDEAL AND REAL GASES AND THERMODYNAMICRELATIONS 1. Define Ideal gas.It is defined as a gas having no forces of intermolecular attraction. These gases will follow the gas laws at all ranges of pressures and temperatures. 2. Define Real gas.It is defined, as a gas having the forces of attraction between molecules tends to be very small at reduced pressures and elevated temperatures. 3. What is equation of state?The relation between the independent properties such as pressure, specific volume and temperature for a pure substance is known as the equation of state. 4. State Boyle’s law.It states that volume of a given mass of a perfect gas varies inversely as the absolute pressure when temperature is constant. 5. State Charle’s law.It states that if any gas is heated at constant...

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Two Mark Questions & Answers | Module 3 | Properties of Pure Substance and Steam Power Cycle

PROPERTIES OF PURE SUBSTANCE AND STEAMPOWER CYCLE 1. Define specific steam consumption of an ideal Rankine cycle.It is defined as the mass flow of steam required per unit power output. 2. Name the different components in steam power plant working on Rankine cycle. Boiler, Turbine, Cooling Tower or Condenser and Pump. 3. What are the effects of condenser pressure on the Rankine Cycle?By lowering the condenser pressure, we can increase the cycle efficiency. The main disadvantage is lowering the back pressure in raise the wetness of steam. Isentropic compression of a very wet vapour is very difficult. 4. Mention the improvements made to increase the ideal efficiency of Rankine cycle.1. Lowering the condenser pressure.2. Superheated steam is supplied to the turbine.3. Increasing...

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Two Mark Questions & Answers | Module 2 | Second Law

SECOND LAW 1. Define Clausius statement.It is impossible for a self-acting machine working in a cyclic process, to transferheat from a body at lower temperature to a body at a higher temperature withoutthe aid of an external agency. 2. What is Perpetual motion machine of the second kind?A heat engine, which converts whole of the heat energy into mechanical work isknown as Perpetual motion machine of the second kind. 3. Define Kelvin Planck Statement.It is impossible to construct a heat engine to produce network in a complete cycleif it exchanges heat from a single reservoir at single fixed temperature. 4. Define Heat pump.A heat pump is a device, which is working in a cycle and transfers heat fromlower temperature to higher temperature. 5. Define Heat engine.Heat engine is a machine, which...

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Two Mark Questions & Answers | Module 1 | Basic Concept And First Law

Basic Concept And First Law 1. What do you understand by pure substance?A pure substance is defined as one that is homogeneous and invariable in chemical composition throughout its mass. 2. Define thermodynamic system.A thermodynamic system is defined as a quantity of matter or a region in space, on which attention in the analysis of the problem is concentrated. 3. Name the different types of system.1. Closed system (only energy transfer and no mass transfer)2. Open system (Both energy and mass transfer)3. Isolated system (No mass and energy transfer) 4. Define thermodynamic equilibrium.If a system is in Mechanical, Thermal and Chemical Equilibrium then the system is in thermodynamically equilibrium.(or) If the system is isolated from its surrounding there will be no change in the macroscopic...

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