Home
Earn $100 Online Daily. Work From Home. Click Here

What is the correct answer?

4

An electric cable of aluminium conductor (k = 240 W/mK) is to be insulated with rubber (k = 0.15 W/mK). The cable is to be located in air (h = 6 W/m²). The critical thickness of insulation will be

A. 25 mm

B. 40 mm

C. 160 mm

D. 800 mm

Related Questions

When absorptivity (α) = 1, reflectivity (ρ) = 0 and transmissivity… Reynolds number is the ratio of In heat exchangers, degree of approach is defined as the difference between… The most commonly used method for the design of duct size is the Fourier's law of heat conduction is valid for A grey body is one whose absorptivity The radiation emitted by a black body is known as The value of the wavelength for maximum emissive power is given by Joule sec is the unit of Which of the following is the case of heat transfer by radiation? The unit of overall coefficient of heat transfer is Fourier's law of heat conduction gives the heat flow for According to Stefan Boltzmann law, the total radiation from a black body… According to Stefan's law, the total radiation from a black body per second… Upto the critical radius of insulation, Unit of thermal conductivity in S.I. units is Film coefficient is defined as the ratio of A steam pipe is to be insulated by two insulating materials put over each… The unit of Stefan-Boltzmann constant is Stefan Boltzmann law is applicable for heat transfer by Total heat is the heat required to Thermal conductivity of water in general with rise in temperature Wiens law states that the wave length corresponding to ________ is proportional… The process of heat transfer from one particle of the body to another… The expression Q = ρ AT4 is called Sensible heat factor is given by (where S.H. = Sensible heat, and L.H.… Temperature of steam at around 540°C can be measured by Two long parallel surfaces each of emissivity 0.7 are maintained at different… Thermal conductivity of a material may be defined as the If the energy radiated per second per sq. cm. of the surface for wave…