HMT UNIT I

1. Which of the following statement is wrong?

• The heat transfer in liquid and gases takes place according to convection

• The amount of heat flow through a body is dependent upon the material of the body

• The thermal conductivity of solid metals increases with rise in temperature

•  Logarithmic mean temperature difference is not equal to the arithmetic mean temperature difference

2. Thermal conductivity of solid metals with rise in temperature normally

• Increases

• Decreases

• Remain constant

• May increase or decrease depending on temperature

3. Heat transfer takes place as per

•  Zeroth law of thermodynamics

• First law of thermodynamic

• Second law of the thermodynamics

• Kirchoff's law

4. When heat is transferred from one particle of hot body to another by actual motion of the heated particles, it is referred to as heat transfer by

• Conduction

• Convection

• Radiation

• Conduction and convection

5. Temperature of steam at around 540°C can be measured by

• Thermometer

• Thermistor

• Thermocouple

• None of these

6. Heat flows from one body to other when they have

• Different heat contents

• Different specific heat

• Different atomic structure

• Different temperatures