Heat Transfer Lab Viva

The Unit of thermal Conductivity k is

• w/m² k

• w/m k

• w/m^{2 0}C

• w/m²

The value of stefan-Boltzmann constant is

• 5.67 x 10^-8 w/m² k⁴

• 56.7 x 10^-8 w/m² k⁴

• 5.067x 10^-8 w/m² k

• 5.067x 10^-8 w/m k

The Emissivity of black body is

• 1

• 0.8

• 0

• 0.6

The unit of the rate of Heat transfer is

• Joule

• Newton

• pascal

• watt

Convective heat transfer coefficient does not depend on

• Surface area

• Space

• Time

• Orientation solid surface

Thermal conductivity is maximum for which substance

• Silver

• Ice

• Aluminum

• Diamond

Heat transfer takes place as per

• Zeroth Law of thermodynamics

• First law of thermodynamics

• Second law of thermodynamics

• kirchoff's Law

When heat is transferred by molecular collision is referred to as heat transfer by

• Conduction

• Convection

• Radiation

• Convection and radiation

Heat Transfer by radiation mainly depends upon

• Its temperature

• Nature of the body

• Kind and extent of its surface

• All of the above

LMTD In case of counter flow Heat exchanger as compared to parallel flow heat exchanger is

• Higher

• Lower

• Same

• Depends on the area of the heat exchanger