Heat Transfer

Heat transfer takes place as per ________________?

A. zeroth law of thermodynamics
B. first law of thermodynamic
C. second law of the thermodynamics
D. Kirchoff’s law E. Stefan’s law

When heat is transferred form hot body to cold body, in a straight line, without affecting the intervening medium, it is referred as heat transfer by __________________?

A. conduction
B. convection
C. radiation
D. conduction and convection
E. convection and radiation

Heat is closely related with___________________?

A. liquids
B. energy
C. temperature
D. entropy
E. enthalpy

The insulation ability of an insulator with the presence of moisture would_________________?

A. increase
B. decrease
C. remain unaffected
D. may increase/decrease depending on temperature and thickness of insulation
E. none of the above

Thermal conductivity of non-metallic amorphous solids with decrease in temperature __________________?

A. increases
B. decreases
C. remains constant
D. may increase or decrease depending on temperature
E. unpredictable

Unit of thermal conductivity in M.K.S. units is ___________________?

A. kcal/kg m2 °C
B. kcal-m/hr m2 °C
C. kcal/hr m2 °C
D. kcal-m/hr °C
E. kcal-m/m2 °C

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 ___________________?

A. conduction
B. convection
C. radiation
D. conduction and convection
E. convection and radiation

Thermal conductivity of solid metals with rise in temperature normally___________________?

A. increases
B. decreases
C. remains constant
D. may increase or decrease depending on temperature
E. unpredictable

Sensible heat is the heat required to __________________?

A. change vapour into liquid
B. change liquid into vapour
C. increase the temperature of a liquid of vapour
D. convert water into steam and superheat it
E. convert saturated steam into dry steam

When heat is Transferred by molecular collision, it is referred to as heat transfer by __________________?

A. conduction
B. convection
C. radiation
D. scattering
E. convection and radiation

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